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Cisco Desk Phone 9800 Series, IP Phone 7800 and 8800 Series, and Video Phone 8875 with SIP Software Denial of Service Vulnerability

Source: cisco / cisco-sa-phone-dos-txMYNRzv — original advisory

Published: 2026-09-02 · Last updated: 2026-09-02 · Vendor severity: High

CVEs

CVECVSSCWEExploitation
CVE-2026-20281 7.5 CWE-401 Not observed in the wild

Affected Products

ProductAffected versionsFixed version
Cisco Session Initiation Protocol (SIP) Software 10.1(1.9) Not specified by vendor Not specified by vendor
Cisco Session Initiation Protocol (SIP) Software 10.1(1)SR1 Not specified by vendor Not specified by vendor
Cisco Session Initiation Protocol (SIP) Software 10.1(1)SR2 Not specified by vendor Not specified by vendor
Cisco Session Initiation Protocol (SIP) Software 10.2(1) Not specified by vendor Not specified by vendor
Cisco Session Initiation Protocol (SIP) Software 10.2(1)SR1 Not specified by vendor Not specified by vendor
Cisco Session Initiation Protocol (SIP) Software 10.2(2) Not specified by vendor Not specified by vendor
Cisco Session Initiation Protocol (SIP) Software 10.3(1) Not specified by vendor Not specified by vendor
Cisco Session Initiation Protocol (SIP) Software 10.3(1.11) 3rd Party Not specified by vendor Not specified by vendor
Cisco Session Initiation Protocol (SIP) Software 10.3(1.9) 3rd Party Not specified by vendor Not specified by vendor
Cisco Session Initiation Protocol (SIP) Software 10.3(1)SR1 Not specified by vendor Not specified by vendor
Cisco Session Initiation Protocol (SIP) Software 10.3(1)SR2 Not specified by vendor Not specified by vendor
Cisco Session Initiation Protocol (SIP) Software 10.3(1)SR3 Not specified by vendor Not specified by vendor
Cisco Session Initiation Protocol (SIP) Software 10.3(1)SR4 Not specified by vendor Not specified by vendor
Cisco Session Initiation Protocol (SIP) Software 10.3(1)SR4b Not specified by vendor Not specified by vendor
Cisco Session Initiation Protocol (SIP) Software 10.3(1)SR5 Not specified by vendor Not specified by vendor
Cisco Session Initiation Protocol (SIP) Software 10.3(1)SR6 Not specified by vendor Not specified by vendor
Cisco Session Initiation Protocol (SIP) Software 10.3(1)SR7 Not specified by vendor Not specified by vendor
Cisco Session Initiation Protocol (SIP) Software 10.3(2) Not specified by vendor Not specified by vendor
Cisco Session Initiation Protocol (SIP) Software 10.4(1) 3rd Party Not specified by vendor Not specified by vendor
Cisco Session Initiation Protocol (SIP) Software 10.4(1)SR2 3rd Party Not specified by vendor Not specified by vendor
Cisco Session Initiation Protocol (SIP) Software 11.0(0.7) MPP Not specified by vendor Not specified by vendor
Cisco Session Initiation Protocol (SIP) Software 11.0(1) Not specified by vendor Not specified by vendor
Cisco Session Initiation Protocol (SIP) Software 11-0-1MSR1-1 Not specified by vendor Not specified by vendor
Cisco Session Initiation Protocol (SIP) Software 11.0(2) Not specified by vendor Not specified by vendor
Cisco Session Initiation Protocol (SIP) Software 11.0(2)SR1 Not specified by vendor Not specified by vendor
Cisco Session Initiation Protocol (SIP) Software 11.0(2)SR2 Not specified by vendor Not specified by vendor
Cisco Session Initiation Protocol (SIP) Software 11.0(3) Not specified by vendor Not specified by vendor
Cisco Session Initiation Protocol (SIP) Software 11.0(3)SR1 Not specified by vendor Not specified by vendor
Cisco Session Initiation Protocol (SIP) Software 11.0(3)SR2 Not specified by vendor Not specified by vendor
Cisco Session Initiation Protocol (SIP) Software 11.0(3)SR3 Not specified by vendor Not specified by vendor
Cisco Session Initiation Protocol (SIP) Software 11.0(3)SR4 Not specified by vendor Not specified by vendor
Cisco Session Initiation Protocol (SIP) Software 11.0(3)SR5 Not specified by vendor Not specified by vendor
Cisco Session Initiation Protocol (SIP) Software 11.0(3)SR6 Not specified by vendor Not specified by vendor
Cisco Session Initiation Protocol (SIP) Software 11.0(4) Not specified by vendor Not specified by vendor
Cisco Session Initiation Protocol (SIP) Software 11.0(4)SR1 Not specified by vendor Not specified by vendor
Cisco Session Initiation Protocol (SIP) Software 11.0(4)SR2 Not specified by vendor Not specified by vendor
Cisco Session Initiation Protocol (SIP) Software 11.0(4)SR3 Not specified by vendor Not specified by vendor
Cisco Session Initiation Protocol (SIP) Software 11.0(5) Not specified by vendor Not specified by vendor
Cisco Session Initiation Protocol (SIP) Software 11.0(5)SR1 Not specified by vendor Not specified by vendor
Cisco Session Initiation Protocol (SIP) Software 11.0(5)SR2 Not specified by vendor Not specified by vendor
Cisco Session Initiation Protocol (SIP) Software 11.0(5)SR3 Not specified by vendor Not specified by vendor
Cisco Session Initiation Protocol (SIP) Software 11.0(6) Not specified by vendor Not specified by vendor
Cisco Session Initiation Protocol (SIP) Software 11.0(6)SR1 Not specified by vendor Not specified by vendor
Cisco Session Initiation Protocol (SIP) Software 11.0(6)SR2 Not specified by vendor Not specified by vendor
Cisco Session Initiation Protocol (SIP) Software 11.0(6)SR4 Not specified by vendor Not specified by vendor
Cisco Session Initiation Protocol (SIP) Software 11.0(6)SR5 Not specified by vendor Not specified by vendor
Cisco Session Initiation Protocol (SIP) Software 11.0(6)SR6 Not specified by vendor Not specified by vendor
Cisco Session Initiation Protocol (SIP) Software 11.0(6)SR7 Not specified by vendor Not specified by vendor
Cisco Session Initiation Protocol (SIP) Software 11.5(1) Not specified by vendor Not specified by vendor
Cisco Session Initiation Protocol (SIP) Software 11.5(1)SR1 Not specified by vendor Not specified by vendor
Cisco Session Initiation Protocol (SIP) Software 11.7(1) Not specified by vendor Not specified by vendor
Cisco Session Initiation Protocol (SIP) Software 12.0(1) Not specified by vendor Not specified by vendor
Cisco Session Initiation Protocol (SIP) Software 12.0(1)SR1 Not specified by vendor Not specified by vendor
Cisco Session Initiation Protocol (SIP) Software 12.0(1)SR2 Not specified by vendor Not specified by vendor
Cisco Session Initiation Protocol (SIP) Software 12.0(1)SR3 Not specified by vendor Not specified by vendor
Cisco Session Initiation Protocol (SIP) Software 12.1(1) Not specified by vendor Not specified by vendor
Cisco Session Initiation Protocol (SIP) Software 12.1(1)SR1 Not specified by vendor Not specified by vendor
Cisco Session Initiation Protocol (SIP) Software 12.5(1) Not specified by vendor Not specified by vendor
Cisco Session Initiation Protocol (SIP) Software 12.5(1)SR1 Not specified by vendor Not specified by vendor
Cisco Session Initiation Protocol (SIP) Software 12.5(1)SR2 Not specified by vendor Not specified by vendor
Cisco Session Initiation Protocol (SIP) Software 12.5(1)SR3 Not specified by vendor Not specified by vendor
Cisco Session Initiation Protocol (SIP) Software 12.6(1) Not specified by vendor Not specified by vendor
Cisco Session Initiation Protocol (SIP) Software 12.6(1)SR1 Not specified by vendor Not specified by vendor
Cisco Session Initiation Protocol (SIP) Software 12.7(1) Not specified by vendor Not specified by vendor
Cisco Session Initiation Protocol (SIP) Software 12.7(1)SR1 Not specified by vendor Not specified by vendor
Cisco Session Initiation Protocol (SIP) Software 12.8(1) Not specified by vendor Not specified by vendor
Cisco Session Initiation Protocol (SIP) Software 12.8(1)SR1 Not specified by vendor Not specified by vendor
Cisco Session Initiation Protocol (SIP) Software 12.8(1)SR2 Not specified by vendor Not specified by vendor
Cisco Session Initiation Protocol (SIP) Software 14.0(1) Not specified by vendor Not specified by vendor
Cisco Session Initiation Protocol (SIP) Software 14.0(1)SR1 Not specified by vendor Not specified by vendor
Cisco Session Initiation Protocol (SIP) Software 14.0(1)SR2 Not specified by vendor Not specified by vendor
Cisco Session Initiation Protocol (SIP) Software 14.0(1)SR3 Not specified by vendor Not specified by vendor
Cisco Session Initiation Protocol (SIP) Software 14.1(1) Not specified by vendor Not specified by vendor
Cisco Session Initiation Protocol (SIP) Software 14.1(1)SR1 Not specified by vendor Not specified by vendor
Cisco Session Initiation Protocol (SIP) Software 14.1(1)SR2 Not specified by vendor Not specified by vendor
Cisco Session Initiation Protocol (SIP) Software 14.1(1)SR3 Not specified by vendor Not specified by vendor
Cisco Session Initiation Protocol (SIP) Software 14.2(1) Not specified by vendor Not specified by vendor
Cisco Session Initiation Protocol (SIP) Software 14.2(1)SR1 Not specified by vendor Not specified by vendor
Cisco Session Initiation Protocol (SIP) Software 14.2(1)SR2 Not specified by vendor Not specified by vendor
Cisco Session Initiation Protocol (SIP) Software 14.2(1)SR3 Not specified by vendor Not specified by vendor
Cisco Session Initiation Protocol (SIP) Software 14.2(1)SR4 Not specified by vendor Not specified by vendor
Cisco Session Initiation Protocol (SIP) Software 14.3(1) Not specified by vendor Not specified by vendor
Cisco Session Initiation Protocol (SIP) Software 14.3(1)SR1 Not specified by vendor Not specified by vendor
Cisco Session Initiation Protocol (SIP) Software 14.3(1)SR2 Not specified by vendor Not specified by vendor
Cisco Session Initiation Protocol (SIP) Software 14.3(1)SR3 Not specified by vendor Not specified by vendor
Cisco Session Initiation Protocol (SIP) Software 14.4(1) Not specified by vendor Not specified by vendor
Cisco Session Initiation Protocol (SIP) Software 14.4(1)SR1 Not specified by vendor Not specified by vendor
Cisco Session Initiation Protocol (SIP) Software 14.4(1)SR2 Not specified by vendor Not specified by vendor
Cisco Session Initiation Protocol (SIP) Software 2.0(1) Not specified by vendor Not specified by vendor
Cisco Session Initiation Protocol (SIP) Software 2.1(1) Not specified by vendor Not specified by vendor
Cisco Session Initiation Protocol (SIP) Software 2.2(1) Not specified by vendor Not specified by vendor
Cisco Session Initiation Protocol (SIP) Software 2.3(1) Not specified by vendor Not specified by vendor
Cisco Session Initiation Protocol (SIP) Software 2.3(1)SR1 Not specified by vendor Not specified by vendor
Cisco Session Initiation Protocol (SIP) Software 3.0(1) Not specified by vendor Not specified by vendor
Cisco Session Initiation Protocol (SIP) Software 3.1(1) Not specified by vendor Not specified by vendor
Cisco Session Initiation Protocol (SIP) Software 3.1(1)SR1 Not specified by vendor Not specified by vendor
Cisco Session Initiation Protocol (SIP) Software 3.2(1) Not specified by vendor Not specified by vendor
Cisco Session Initiation Protocol (SIP) Software 3.3(1) Not specified by vendor Not specified by vendor
Cisco Session Initiation Protocol (SIP) Software 3.4(1) Not specified by vendor Not specified by vendor
Cisco Session Initiation Protocol (SIP) Software 3.5(1) Not specified by vendor Not specified by vendor
Cisco Session Initiation Protocol (SIP) Software 3.5(1)SR1 Not specified by vendor Not specified by vendor
Cisco Session Initiation Protocol (SIP) Software 3.6(1) Not specified by vendor Not specified by vendor
Cisco Session Initiation Protocol (SIP) Software 4.0(1) Not specified by vendor Not specified by vendor
Cisco Session Initiation Protocol (SIP) Software 4.1(1) Not specified by vendor Not specified by vendor
Cisco Session Initiation Protocol (SIP) Software 4.1(1)SR1 Not specified by vendor Not specified by vendor
Cisco Session Initiation Protocol (SIP) Software 9.3(3) Not specified by vendor Not specified by vendor
Cisco Session Initiation Protocol (SIP) Software 9.3(4) 3rd Party Not specified by vendor Not specified by vendor
Cisco Session Initiation Protocol (SIP) Software 9.3(4)SR1 3rd Party Not specified by vendor Not specified by vendor
Cisco Session Initiation Protocol (SIP) Software 9.3(4)SR2 3rd Party Not specified by vendor Not specified by vendor
Cisco Session Initiation Protocol (SIP) Software 9.3(4)SR3 3rd Party Not specified by vendor Not specified by vendor