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Cisco IOS XE Software Blocks Extensible Exchange Protocol Denial of Service Vulnerability

Source: cisco / cisco-sa-iosxe-bing-MGHrFAkd — original advisory

Published: 2026-08-05 · Last updated: 2026-08-05 · Vendor severity: High

CVEs

CVECVSSCWEExploitation
CVE-2026-20263 8.6 CWE-388 Not observed in the wild

Affected Products

ProductAffected versionsFixed version
Cisco IOS XE Software 16.10.1 Not specified by vendor Not specified by vendor
Cisco IOS XE Software 16.10.1a Not specified by vendor Not specified by vendor
Cisco IOS XE Software 16.10.1b Not specified by vendor Not specified by vendor
Cisco IOS XE Software 16.10.1c Not specified by vendor Not specified by vendor
Cisco IOS XE Software 16.10.1d Not specified by vendor Not specified by vendor
Cisco IOS XE Software 16.10.1e Not specified by vendor Not specified by vendor
Cisco IOS XE Software 16.10.1f Not specified by vendor Not specified by vendor
Cisco IOS XE Software 16.10.1g Not specified by vendor Not specified by vendor
Cisco IOS XE Software 16.10.1s Not specified by vendor Not specified by vendor
Cisco IOS XE Software 16.10.2 Not specified by vendor Not specified by vendor
Cisco IOS XE Software 16.10.3 Not specified by vendor Not specified by vendor
Cisco IOS XE Software 16.11.1 Not specified by vendor Not specified by vendor
Cisco IOS XE Software 16.11.1a Not specified by vendor Not specified by vendor
Cisco IOS XE Software 16.11.1b Not specified by vendor Not specified by vendor
Cisco IOS XE Software 16.11.1c Not specified by vendor Not specified by vendor
Cisco IOS XE Software 16.11.1s Not specified by vendor Not specified by vendor
Cisco IOS XE Software 16.11.2 Not specified by vendor Not specified by vendor
Cisco IOS XE Software 16.12.1 Not specified by vendor Not specified by vendor
Cisco IOS XE Software 16.12.10 Not specified by vendor Not specified by vendor
Cisco IOS XE Software 16.12.10a Not specified by vendor Not specified by vendor
Cisco IOS XE Software 16.12.11 Not specified by vendor Not specified by vendor
Cisco IOS XE Software 16.12.12 Not specified by vendor Not specified by vendor
Cisco IOS XE Software 16.12.13 Not specified by vendor Not specified by vendor
Cisco IOS XE Software 16.12.14 Not specified by vendor Not specified by vendor
Cisco IOS XE Software 16.12.15 Not specified by vendor Not specified by vendor
Cisco IOS XE Software 16.12.1a Not specified by vendor Not specified by vendor
Cisco IOS XE Software 16.12.1c Not specified by vendor Not specified by vendor
Cisco IOS XE Software 16.12.1s Not specified by vendor Not specified by vendor
Cisco IOS XE Software 16.12.1t Not specified by vendor Not specified by vendor
Cisco IOS XE Software 16.12.1w Not specified by vendor Not specified by vendor
Cisco IOS XE Software 16.12.1x Not specified by vendor Not specified by vendor
Cisco IOS XE Software 16.12.1y Not specified by vendor Not specified by vendor
Cisco IOS XE Software 16.12.1z Not specified by vendor Not specified by vendor
Cisco IOS XE Software 16.12.1z1 Not specified by vendor Not specified by vendor
Cisco IOS XE Software 16.12.1z2 Not specified by vendor Not specified by vendor
Cisco IOS XE Software 16.12.2 Not specified by vendor Not specified by vendor
Cisco IOS XE Software 16.12.2a Not specified by vendor Not specified by vendor
Cisco IOS XE Software 16.12.2s Not specified by vendor Not specified by vendor
Cisco IOS XE Software 16.12.2t Not specified by vendor Not specified by vendor
Cisco IOS XE Software 16.12.3 Not specified by vendor Not specified by vendor
Cisco IOS XE Software 16.12.3a Not specified by vendor Not specified by vendor
Cisco IOS XE Software 16.12.3s Not specified by vendor Not specified by vendor
Cisco IOS XE Software 16.12.4 Not specified by vendor Not specified by vendor
Cisco IOS XE Software 16.12.4a Not specified by vendor Not specified by vendor
Cisco IOS XE Software 16.12.5 Not specified by vendor Not specified by vendor
Cisco IOS XE Software 16.12.5a Not specified by vendor Not specified by vendor
Cisco IOS XE Software 16.12.5b Not specified by vendor Not specified by vendor
Cisco IOS XE Software 16.12.6 Not specified by vendor Not specified by vendor
Cisco IOS XE Software 16.12.6a Not specified by vendor Not specified by vendor
Cisco IOS XE Software 16.12.7 Not specified by vendor Not specified by vendor
Cisco IOS XE Software 16.12.8 Not specified by vendor Not specified by vendor
Cisco IOS XE Software 16.12.9 Not specified by vendor Not specified by vendor
Cisco IOS XE Software 16.6.1 Not specified by vendor Not specified by vendor
Cisco IOS XE Software 16.6.10 Not specified by vendor Not specified by vendor
Cisco IOS XE Software 16.6.2 Not specified by vendor Not specified by vendor
Cisco IOS XE Software 16.6.3 Not specified by vendor Not specified by vendor
Cisco IOS XE Software 16.6.4 Not specified by vendor Not specified by vendor
Cisco IOS XE Software 16.6.4a Not specified by vendor Not specified by vendor
Cisco IOS XE Software 16.6.4s Not specified by vendor Not specified by vendor
Cisco IOS XE Software 16.6.5 Not specified by vendor Not specified by vendor
Cisco IOS XE Software 16.6.5a Not specified by vendor Not specified by vendor
Cisco IOS XE Software 16.6.5b Not specified by vendor Not specified by vendor
Cisco IOS XE Software 16.6.6 Not specified by vendor Not specified by vendor
Cisco IOS XE Software 16.6.7 Not specified by vendor Not specified by vendor
Cisco IOS XE Software 16.6.7a Not specified by vendor Not specified by vendor
Cisco IOS XE Software 16.6.8 Not specified by vendor Not specified by vendor
Cisco IOS XE Software 16.6.9 Not specified by vendor Not specified by vendor
Cisco IOS XE Software 16.7.1 Not specified by vendor Not specified by vendor
Cisco IOS XE Software 16.7.1a Not specified by vendor Not specified by vendor
Cisco IOS XE Software 16.7.1b Not specified by vendor Not specified by vendor
Cisco IOS XE Software 16.7.2 Not specified by vendor Not specified by vendor
Cisco IOS XE Software 16.7.3 Not specified by vendor Not specified by vendor
Cisco IOS XE Software 16.7.4 Not specified by vendor Not specified by vendor
Cisco IOS XE Software 16.8.1 Not specified by vendor Not specified by vendor
Cisco IOS XE Software 16.8.1a Not specified by vendor Not specified by vendor
Cisco IOS XE Software 16.8.1b Not specified by vendor Not specified by vendor
Cisco IOS XE Software 16.8.1c Not specified by vendor Not specified by vendor
Cisco IOS XE Software 16.8.1d Not specified by vendor Not specified by vendor
Cisco IOS XE Software 16.8.1e Not specified by vendor Not specified by vendor
Cisco IOS XE Software 16.8.1s Not specified by vendor Not specified by vendor
Cisco IOS XE Software 16.8.2 Not specified by vendor Not specified by vendor
Cisco IOS XE Software 16.8.3 Not specified by vendor Not specified by vendor
Cisco IOS XE Software 16.9.1 Not specified by vendor Not specified by vendor
Cisco IOS XE Software 16.9.1a Not specified by vendor Not specified by vendor
Cisco IOS XE Software 16.9.1b Not specified by vendor Not specified by vendor
Cisco IOS XE Software 16.9.1c Not specified by vendor Not specified by vendor
Cisco IOS XE Software 16.9.1d Not specified by vendor Not specified by vendor
Cisco IOS XE Software 16.9.1s Not specified by vendor Not specified by vendor
Cisco IOS XE Software 16.9.2 Not specified by vendor Not specified by vendor
Cisco IOS XE Software 16.9.2a Not specified by vendor Not specified by vendor
Cisco IOS XE Software 16.9.2s Not specified by vendor Not specified by vendor
Cisco IOS XE Software 16.9.3 Not specified by vendor Not specified by vendor
Cisco IOS XE Software 16.9.3a Not specified by vendor Not specified by vendor
Cisco IOS XE Software 16.9.3h Not specified by vendor Not specified by vendor
Cisco IOS XE Software 16.9.3s Not specified by vendor Not specified by vendor
Cisco IOS XE Software 16.9.4 Not specified by vendor Not specified by vendor
Cisco IOS XE Software 16.9.4c Not specified by vendor Not specified by vendor
Cisco IOS XE Software 16.9.5 Not specified by vendor Not specified by vendor
Cisco IOS XE Software 16.9.5f Not specified by vendor Not specified by vendor
Cisco IOS XE Software 16.9.6 Not specified by vendor Not specified by vendor
Cisco IOS XE Software 16.9.7 Not specified by vendor Not specified by vendor
Cisco IOS XE Software 16.9.8 Not specified by vendor Not specified by vendor
Cisco IOS XE Software 16.9.8a Not specified by vendor Not specified by vendor
Cisco IOS XE Software 16.9.8b Not specified by vendor Not specified by vendor
Cisco IOS XE Software 17.10.1 Not specified by vendor Not specified by vendor
Cisco IOS XE Software 17.10.1a Not specified by vendor Not specified by vendor
Cisco IOS XE Software 17.10.1b Not specified by vendor Not specified by vendor
Cisco IOS XE Software 17.1.1 Not specified by vendor Not specified by vendor
Cisco IOS XE Software 17.11.1 Not specified by vendor Not specified by vendor
Cisco IOS XE Software 17.11.1a Not specified by vendor Not specified by vendor
Cisco IOS XE Software 17.1.1a Not specified by vendor Not specified by vendor
Cisco IOS XE Software 17.1.1s Not specified by vendor Not specified by vendor
Cisco IOS XE Software 17.1.1t Not specified by vendor Not specified by vendor
Cisco IOS XE Software 17.1.2 Not specified by vendor Not specified by vendor
Cisco IOS XE Software 17.12.1 Not specified by vendor Not specified by vendor
Cisco IOS XE Software 17.12.1a Not specified by vendor Not specified by vendor
Cisco IOS XE Software 17.12.1w Not specified by vendor Not specified by vendor
Cisco IOS XE Software 17.12.1x Not specified by vendor Not specified by vendor
Cisco IOS XE Software 17.12.1y Not specified by vendor Not specified by vendor
Cisco IOS XE Software 17.12.1z Not specified by vendor Not specified by vendor
Cisco IOS XE Software 17.12.1z1 Not specified by vendor Not specified by vendor
Cisco IOS XE Software 17.12.1z2 Not specified by vendor Not specified by vendor
Cisco IOS XE Software 17.12.1z3 Not specified by vendor Not specified by vendor
Cisco IOS XE Software 17.12.1z4 Not specified by vendor Not specified by vendor
Cisco IOS XE Software 17.12.1z5 Not specified by vendor Not specified by vendor
Cisco IOS XE Software 17.12.1z6 Not specified by vendor Not specified by vendor
Cisco IOS XE Software 17.12.2 Not specified by vendor Not specified by vendor
Cisco IOS XE Software 17.12.2a Not specified by vendor Not specified by vendor
Cisco IOS XE Software 17.12.3 Not specified by vendor Not specified by vendor
Cisco IOS XE Software 17.12.3a Not specified by vendor Not specified by vendor
Cisco IOS XE Software 17.12.4 Not specified by vendor Not specified by vendor
Cisco IOS XE Software 17.12.4a Not specified by vendor Not specified by vendor
Cisco IOS XE Software 17.12.4b Not specified by vendor Not specified by vendor
Cisco IOS XE Software 17.12.5 Not specified by vendor Not specified by vendor
Cisco IOS XE Software 17.12.5a Not specified by vendor Not specified by vendor
Cisco IOS XE Software 17.12.5b Not specified by vendor Not specified by vendor
Cisco IOS XE Software 17.12.5c Not specified by vendor Not specified by vendor
Cisco IOS XE Software 17.12.5d Not specified by vendor Not specified by vendor
Cisco IOS XE Software 17.12.6 Not specified by vendor Not specified by vendor
Cisco IOS XE Software 17.12.6a Not specified by vendor Not specified by vendor
Cisco IOS XE Software 17.12.6b Not specified by vendor Not specified by vendor
Cisco IOS XE Software 17.12.7 Not specified by vendor Not specified by vendor
Cisco IOS XE Software 17.12.7a Not specified by vendor Not specified by vendor
Cisco IOS XE Software 17.12.7b Not specified by vendor Not specified by vendor
Cisco IOS XE Software 17.1.3 Not specified by vendor Not specified by vendor
Cisco IOS XE Software 17.13.1 Not specified by vendor Not specified by vendor
Cisco IOS XE Software 17.13.1a Not specified by vendor Not specified by vendor
Cisco IOS XE Software 17.14.1 Not specified by vendor Not specified by vendor
Cisco IOS XE Software 17.14.1a Not specified by vendor Not specified by vendor
Cisco IOS XE Software 17.15.1 Not specified by vendor Not specified by vendor
Cisco IOS XE Software 17.15.1a Not specified by vendor Not specified by vendor
Cisco IOS XE Software 17.15.1b Not specified by vendor Not specified by vendor
Cisco IOS XE Software 17.15.1w Not specified by vendor Not specified by vendor
Cisco IOS XE Software 17.15.1x Not specified by vendor Not specified by vendor
Cisco IOS XE Software 17.15.1y Not specified by vendor Not specified by vendor
Cisco IOS XE Software 17.15.1z Not specified by vendor Not specified by vendor
Cisco IOS XE Software 17.15.2 Not specified by vendor Not specified by vendor
Cisco IOS XE Software 17.15.2a Not specified by vendor Not specified by vendor
Cisco IOS XE Software 17.15.2b Not specified by vendor Not specified by vendor
Cisco IOS XE Software 17.15.2c Not specified by vendor Not specified by vendor
Cisco IOS XE Software 17.15.3 Not specified by vendor Not specified by vendor
Cisco IOS XE Software 17.15.3a Not specified by vendor Not specified by vendor
Cisco IOS XE Software 17.15.3b Not specified by vendor Not specified by vendor
Cisco IOS XE Software 17.15.4 Not specified by vendor Not specified by vendor
Cisco IOS XE Software 17.15.4a Not specified by vendor Not specified by vendor
Cisco IOS XE Software 17.15.4b Not specified by vendor Not specified by vendor
Cisco IOS XE Software 17.15.4c Not specified by vendor Not specified by vendor
Cisco IOS XE Software 17.15.4d Not specified by vendor Not specified by vendor
Cisco IOS XE Software 17.15.4s1 Not specified by vendor Not specified by vendor
Cisco IOS XE Software 17.15.5 Not specified by vendor Not specified by vendor
Cisco IOS XE Software 17.15.5a Not specified by vendor Not specified by vendor
Cisco IOS XE Software 17.16.1 Not specified by vendor Not specified by vendor
Cisco IOS XE Software 17.16.1a Not specified by vendor Not specified by vendor
Cisco IOS XE Software 17.17.1 Not specified by vendor Not specified by vendor
Cisco IOS XE Software 17.18.1 Not specified by vendor Not specified by vendor
Cisco IOS XE Software 17.18.1a Not specified by vendor Not specified by vendor
Cisco IOS XE Software 17.18.1w Not specified by vendor Not specified by vendor
Cisco IOS XE Software 17.18.1x Not specified by vendor Not specified by vendor
Cisco IOS XE Software 17.18.1y Not specified by vendor Not specified by vendor
Cisco IOS XE Software 17.18.1z Not specified by vendor Not specified by vendor
Cisco IOS XE Software 17.18.2 Not specified by vendor Not specified by vendor
Cisco IOS XE Software 17.18.3 Not specified by vendor Not specified by vendor
Cisco IOS XE Software 17.18.3a Not specified by vendor Not specified by vendor
Cisco IOS XE Software 17.2.1 Not specified by vendor Not specified by vendor
Cisco IOS XE Software 17.2.1a Not specified by vendor Not specified by vendor
Cisco IOS XE Software 17.2.1r Not specified by vendor Not specified by vendor
Cisco IOS XE Software 17.2.1v Not specified by vendor Not specified by vendor
Cisco IOS XE Software 17.2.2 Not specified by vendor Not specified by vendor
Cisco IOS XE Software 17.2.3 Not specified by vendor Not specified by vendor
Cisco IOS XE Software 17.3.1 Not specified by vendor Not specified by vendor
Cisco IOS XE Software 17.3.1a Not specified by vendor Not specified by vendor
Cisco IOS XE Software 17.3.1w Not specified by vendor Not specified by vendor
Cisco IOS XE Software 17.3.1x Not specified by vendor Not specified by vendor
Cisco IOS XE Software 17.3.1z Not specified by vendor Not specified by vendor
Cisco IOS XE Software 17.3.2 Not specified by vendor Not specified by vendor
Cisco IOS XE Software 17.3.2a Not specified by vendor Not specified by vendor
Cisco IOS XE Software 17.3.3 Not specified by vendor Not specified by vendor
Cisco IOS XE Software 17.3.3a Not specified by vendor Not specified by vendor
Cisco IOS XE Software 17.3.4 Not specified by vendor Not specified by vendor
Cisco IOS XE Software 17.3.4a Not specified by vendor Not specified by vendor
Cisco IOS XE Software 17.3.4b Not specified by vendor Not specified by vendor
Cisco IOS XE Software 17.3.4c Not specified by vendor Not specified by vendor
Cisco IOS XE Software 17.3.5 Not specified by vendor Not specified by vendor
Cisco IOS XE Software 17.3.5a Not specified by vendor Not specified by vendor
Cisco IOS XE Software 17.3.5b Not specified by vendor Not specified by vendor
Cisco IOS XE Software 17.3.6 Not specified by vendor Not specified by vendor
Cisco IOS XE Software 17.3.7 Not specified by vendor Not specified by vendor
Cisco IOS XE Software 17.3.8 Not specified by vendor Not specified by vendor
Cisco IOS XE Software 17.3.8a Not specified by vendor Not specified by vendor
Cisco IOS XE Software 17.4.1 Not specified by vendor Not specified by vendor
Cisco IOS XE Software 17.4.1a Not specified by vendor Not specified by vendor
Cisco IOS XE Software 17.4.1b Not specified by vendor Not specified by vendor
Cisco IOS XE Software 17.4.1c Not specified by vendor Not specified by vendor
Cisco IOS XE Software 17.4.2 Not specified by vendor Not specified by vendor
Cisco IOS XE Software 17.4.2a Not specified by vendor Not specified by vendor
Cisco IOS XE Software 17.5.1 Not specified by vendor Not specified by vendor
Cisco IOS XE Software 17.5.1a Not specified by vendor Not specified by vendor
Cisco IOS XE Software 17.5.1b Not specified by vendor Not specified by vendor
Cisco IOS XE Software 17.5.1c Not specified by vendor Not specified by vendor
Cisco IOS XE Software 17.6.1 Not specified by vendor Not specified by vendor
Cisco IOS XE Software 17.6.1a Not specified by vendor Not specified by vendor
Cisco IOS XE Software 17.6.1w Not specified by vendor Not specified by vendor
Cisco IOS XE Software 17.6.1x Not specified by vendor Not specified by vendor
Cisco IOS XE Software 17.6.1y Not specified by vendor Not specified by vendor
Cisco IOS XE Software 17.6.1z Not specified by vendor Not specified by vendor
Cisco IOS XE Software 17.6.1z1 Not specified by vendor Not specified by vendor
Cisco IOS XE Software 17.6.2 Not specified by vendor Not specified by vendor
Cisco IOS XE Software 17.6.3 Not specified by vendor Not specified by vendor
Cisco IOS XE Software 17.6.3a Not specified by vendor Not specified by vendor
Cisco IOS XE Software 17.6.4 Not specified by vendor Not specified by vendor
Cisco IOS XE Software 17.6.5 Not specified by vendor Not specified by vendor
Cisco IOS XE Software 17.6.5a Not specified by vendor Not specified by vendor
Cisco IOS XE Software 17.6.6 Not specified by vendor Not specified by vendor
Cisco IOS XE Software 17.6.6a Not specified by vendor Not specified by vendor
Cisco IOS XE Software 17.6.7 Not specified by vendor Not specified by vendor
Cisco IOS XE Software 17.6.8 Not specified by vendor Not specified by vendor
Cisco IOS XE Software 17.6.8a Not specified by vendor Not specified by vendor
Cisco IOS XE Software 17.7.1 Not specified by vendor Not specified by vendor
Cisco IOS XE Software 17.7.1a Not specified by vendor Not specified by vendor
Cisco IOS XE Software 17.7.1b Not specified by vendor Not specified by vendor
Cisco IOS XE Software 17.7.2 Not specified by vendor Not specified by vendor
Cisco IOS XE Software 17.8.1 Not specified by vendor Not specified by vendor
Cisco IOS XE Software 17.8.1a Not specified by vendor Not specified by vendor
Cisco IOS XE Software 17.9.1 Not specified by vendor Not specified by vendor
Cisco IOS XE Software 17.9.1a Not specified by vendor Not specified by vendor
Cisco IOS XE Software 17.9.1w Not specified by vendor Not specified by vendor
Cisco IOS XE Software 17.9.1x Not specified by vendor Not specified by vendor
Cisco IOS XE Software 17.9.1x1 Not specified by vendor Not specified by vendor
Cisco IOS XE Software 17.9.1y Not specified by vendor Not specified by vendor
Cisco IOS XE Software 17.9.1y1 Not specified by vendor Not specified by vendor
Cisco IOS XE Software 17.9.2 Not specified by vendor Not specified by vendor
Cisco IOS XE Software 17.9.2a Not specified by vendor Not specified by vendor
Cisco IOS XE Software 17.9.3 Not specified by vendor Not specified by vendor
Cisco IOS XE Software 17.9.3a Not specified by vendor Not specified by vendor
Cisco IOS XE Software 17.9.4 Not specified by vendor Not specified by vendor
Cisco IOS XE Software 17.9.4a Not specified by vendor Not specified by vendor
Cisco IOS XE Software 17.9.5 Not specified by vendor Not specified by vendor
Cisco IOS XE Software 17.9.5a Not specified by vendor Not specified by vendor
Cisco IOS XE Software 17.9.5b Not specified by vendor Not specified by vendor
Cisco IOS XE Software 17.9.5c Not specified by vendor Not specified by vendor
Cisco IOS XE Software 17.9.5d Not specified by vendor Not specified by vendor
Cisco IOS XE Software 17.9.5e Not specified by vendor Not specified by vendor
Cisco IOS XE Software 17.9.5f Not specified by vendor Not specified by vendor
Cisco IOS XE Software 17.9.6 Not specified by vendor Not specified by vendor
Cisco IOS XE Software 17.9.6a Not specified by vendor Not specified by vendor
Cisco IOS XE Software 17.9.6b Not specified by vendor Not specified by vendor
Cisco IOS XE Software 17.9.7 Not specified by vendor Not specified by vendor
Cisco IOS XE Software 17.9.7a Not specified by vendor Not specified by vendor
Cisco IOS XE Software 17.9.7b Not specified by vendor Not specified by vendor
Cisco IOS XE Software 17.9.8 Not specified by vendor Not specified by vendor
Cisco IOS XE Software 17.9.9 Not specified by vendor Not specified by vendor
Cisco IOS XE Software 26.1.1 Not specified by vendor Not specified by vendor
Cisco IOS XE Software 26.1.1a Not specified by vendor Not specified by vendor
Cisco IOS XE Software 26.2.1ea Not specified by vendor Not specified by vendor