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Cisco Nexus 3000 and 9000 Series Switches Border Gateway Protocol Denial of Service Vulnerability

Source: cisco / cisco-sa-bgp-iefab-3hb2pwtx — original advisory

Published: 2026-05-20 · Last updated: 2026-05-20 · Vendor severity: Medium

CVEs

CVECVSSCWEExploitation
CVE-2026-20171 6.8 CWE-670: Always-Incorrect Control Flow Implementation Not observed in the wild

Affected Products

ProductAffected versionsFixed version
Cisco NX-OS Software 10.2(1) Not specified by vendor Not specified by vendor
Cisco NX-OS Software 10.2(1q) Not specified by vendor Not specified by vendor
Cisco NX-OS Software 10.2(2) Not specified by vendor Not specified by vendor
Cisco NX-OS Software 10.2(2a) Not specified by vendor Not specified by vendor
Cisco NX-OS Software 10.2(3) Not specified by vendor Not specified by vendor
Cisco NX-OS Software 10.2(3t) Not specified by vendor Not specified by vendor
Cisco NX-OS Software 10.2(3v) Not specified by vendor Not specified by vendor
Cisco NX-OS Software 10.2(4) Not specified by vendor Not specified by vendor
Cisco NX-OS Software 10.2(5) Not specified by vendor Not specified by vendor
Cisco NX-OS Software 10.2(6) Not specified by vendor Not specified by vendor
Cisco NX-OS Software 10.2(7) Not specified by vendor Not specified by vendor
Cisco NX-OS Software 10.2(8) Not specified by vendor Not specified by vendor
Cisco NX-OS Software 10.2(9) Not specified by vendor Not specified by vendor
Cisco NX-OS Software 10.3(1) Not specified by vendor Not specified by vendor
Cisco NX-OS Software 10.3(2) Not specified by vendor Not specified by vendor
Cisco NX-OS Software 10.3(3) Not specified by vendor Not specified by vendor
Cisco NX-OS Software 10.3(3o) Not specified by vendor Not specified by vendor
Cisco NX-OS Software 10.3(3p) Not specified by vendor Not specified by vendor
Cisco NX-OS Software 10.3(3q) Not specified by vendor Not specified by vendor
Cisco NX-OS Software 10.3(3r) Not specified by vendor Not specified by vendor
Cisco NX-OS Software 10.3(3w) Not specified by vendor Not specified by vendor
Cisco NX-OS Software 10.3(3x) Not specified by vendor Not specified by vendor
Cisco NX-OS Software 10.3(4) Not specified by vendor Not specified by vendor
Cisco NX-OS Software 10.3(4a) Not specified by vendor Not specified by vendor
Cisco NX-OS Software 10.3(4g) Not specified by vendor Not specified by vendor
Cisco NX-OS Software 10.3(4h) Not specified by vendor Not specified by vendor
Cisco NX-OS Software 10.3(5) Not specified by vendor Not specified by vendor
Cisco NX-OS Software 10.3(6) Not specified by vendor Not specified by vendor
Cisco NX-OS Software 10.3(7) Not specified by vendor Not specified by vendor
Cisco NX-OS Software 10.3(8) Not specified by vendor Not specified by vendor
Cisco NX-OS Software 10.3(99w) Not specified by vendor Not specified by vendor
Cisco NX-OS Software 10.3(99x) Not specified by vendor Not specified by vendor
Cisco NX-OS Software 10.4(1) Not specified by vendor Not specified by vendor
Cisco NX-OS Software 10.4(2) Not specified by vendor Not specified by vendor
Cisco NX-OS Software 10.4(3) Not specified by vendor Not specified by vendor
Cisco NX-OS Software 10.4(4) Not specified by vendor Not specified by vendor
Cisco NX-OS Software 10.4(4g) Not specified by vendor Not specified by vendor
Cisco NX-OS Software 10.4(5) Not specified by vendor Not specified by vendor
Cisco NX-OS Software 10.4(6) Not specified by vendor Not specified by vendor
Cisco NX-OS Software 10.5(1) Not specified by vendor Not specified by vendor
Cisco NX-OS Software 10.5(2) Not specified by vendor Not specified by vendor
Cisco NX-OS Software 10.5(3) Not specified by vendor Not specified by vendor
Cisco NX-OS Software 10.5(3e) Not specified by vendor Not specified by vendor
Cisco NX-OS Software 10.5(3o) Not specified by vendor Not specified by vendor
Cisco NX-OS Software 10.5(3p) Not specified by vendor Not specified by vendor
Cisco NX-OS Software 10.5(3s) Not specified by vendor Not specified by vendor
Cisco NX-OS Software 10.5(3t) Not specified by vendor Not specified by vendor
Cisco NX-OS Software 10.6(1) Not specified by vendor Not specified by vendor
Cisco NX-OS Software 10.6(1s) Not specified by vendor Not specified by vendor