CVE-2025-20160: A vulnerability in the implementation of the TACACS+ protocol in Cisco IOS

Description

A vulnerability in the implementation of the TACACS+ protocol in Cisco IOS Software and Cisco IOS XE Software could allow an unauthenticated, remote attacker to view sensitive data or bypass authentication. This vulnerability exists because the system does not properly check whether the required TACACS+ shared secret is configured. A machine-in-the-middle attacker could exploit this vulnerability by intercepting and reading unencrypted TACACS+ messages or impersonating the TACACS+ server and falsely accepting arbitrary authentication requests. A successful exploit could allow the attacker to view sensitive information in a TACACS+ message or bypass authentication and gain access to the affected device.

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

Cisco IOS

15.2(6)E1affected
15.2(4)E6affected
15.2(6)E2affected
15.2(4)E7affected
15.2(7)Eaffected
15.2(4)E8affected
15.2(6)E2aaffected
15.2(6)E2baffected
15.2(7)E1affected
15.2(7)E0aaffected
15.2(7)E0baffected
15.2(7)E0saffected
15.2(6)E3affected
15.2(4)E9affected
15.2(7)E2affected
15.2(7a)E0baffected
15.2(4)E10affected
15.2(7)E3affected
15.2(7)E1aaffected
15.2(7b)E0baffected
15.2(7)E2aaffected
15.2(4)E10aaffected
15.2(7)E4affected
15.2(7)E3kaffected
15.2(8)Eaffected
15.2(8)E1affected
15.2(7)E5affected
15.2(7)E6affected
15.2(8)E2affected
15.2(4)E10daffected
15.2(7)E7affected
15.2(8)E3affected
15.2(7)E8affected
15.2(8)E4affected
15.2(7)E9affected
15.2(8)E5affected
15.2(8)E6affected
15.2(7)E10affected
15.2(7)E11affected
15.2(8)E7affected
15.2(7)E12affected
15.5(3)S8affected
15.5(3)S9affected
15.5(3)S10affected
15.5(3)S9aaffected
15.2(6)EBaffected
15.5(3)M7affected
15.5(3)M8affected
15.5(3)M9affected
15.5(3)M10affected
15.6(2)SP5affected
15.6(2)SP6affected
15.6(2)SP7affected
15.6(2)SP8affected
15.6(2)SP9affected
15.6(3)M4affected
15.6(3)M5affected
15.6(3)M6affected
15.6(3)M7affected
15.6(3)M6aaffected
15.6(3)M6baffected
15.6(3)M8affected
15.6(3)M9affected
15.5(1)SY2affected
15.5(1)SY3affected
15.5(1)SY4affected
15.5(1)SY5affected
15.5(1)SY6affected
15.5(1)SY7affected
15.5(1)SY8affected
15.5(1)SY9affected
15.5(1)SY10affected
15.5(1)SY11affected
15.5(1)SY12affected
15.5(1)SY13affected
15.5(1)SY14affected
15.5(1)SY15affected
15.7(3)M3affected
15.7(3)M2affected
15.7(3)M4affected
15.7(3)M5affected
15.7(3)M4aaffected
15.7(3)M4baffected
15.7(3)M6affected
15.7(3)M7affected
15.7(3)M8affected
15.7(3)M9affected
15.8(3)Maffected
15.8(3)M1affected
15.8(3)M0aaffected
15.8(3)M0baffected
15.8(3)M2affected
15.8(3)M1aaffected
15.8(3)M3affected
15.8(3)M2aaffected
15.8(3)M4affected
15.8(3)M3aaffected
15.8(3)M3baffected
15.8(3)M5affected
15.8(3)M6affected
15.8(3)M7affected
15.8(3)M8affected
15.8(3)M9affected
15.9(3)Maffected
15.9(3)M1affected
15.9(3)M0aaffected
15.9(3)M2affected
15.9(3)M3affected
15.9(3)M2aaffected
15.9(3)M3aaffected
15.9(3)M4affected
15.9(3)M3baffected
15.9(3)M5affected
15.9(3)M4aaffected
15.9(3)M6affected
15.9(3)M7affected
15.9(3)M6aaffected
15.9(3)M6baffected
15.9(3)M8affected
15.9(3)M7aaffected
15.9(3)M9affected
15.9(3)M8baffected
15.9(3)M10affected
15.9(3)M11affected

Cisco Cisco IOS XE Software

3.16.8Saffected
3.16.9Saffected
3.16.10Saffected
3.8.6Eaffected
3.8.7Eaffected
3.8.8Eaffected
3.8.9Eaffected
3.8.10Eaffected
3.18.5SPaffected
3.18.6SPaffected
3.18.7SPaffected
3.18.8aSPaffected
3.18.9SPaffected
16.6.5affected
16.6.5aaffected
16.6.6affected
16.6.7affected
16.6.8affected
16.6.9affected
16.6.10affected
16.8.1affected
16.8.1aaffected
16.8.1baffected
16.8.1saffected
16.8.1caffected
16.8.1daffected
16.8.2affected
16.8.1eaffected
16.8.3affected
16.9.1affected
16.9.2affected
16.9.1aaffected
16.9.1baffected
16.9.1saffected
16.9.3affected
16.9.4affected
16.9.3aaffected
16.9.5affected
16.9.5faffected
16.9.6affected
16.9.7affected
16.9.8affected
16.10.1affected
16.10.1aaffected
16.10.1baffected
16.10.1saffected
16.10.1caffected
16.10.1eaffected
16.10.1daffected
16.10.2affected
16.10.1faffected
16.10.1gaffected
16.10.3affected
3.10.1Eaffected
3.10.2Eaffected
3.10.3Eaffected
16.11.1affected
16.11.1aaffected
16.11.1baffected
16.11.2affected
16.11.1saffected
16.12.1affected
16.12.1saffected
16.12.1aaffected
16.12.1caffected
16.12.1waffected
16.12.2affected
16.12.1yaffected
16.12.2aaffected
16.12.3affected
16.12.8affected
16.12.2saffected
16.12.1xaffected
16.12.1taffected
16.12.4affected
16.12.3saffected
16.12.3aaffected
16.12.4aaffected
16.12.5affected
16.12.6affected
16.12.1z1affected
16.12.5aaffected
16.12.5baffected
16.12.1z2affected
16.12.6aaffected
16.12.7affected
16.12.9affected
16.12.10affected
16.12.10aaffected
16.12.11affected
16.12.12affected
16.12.13affected
3.11.0Eaffected
3.11.1Eaffected
3.11.2Eaffected
3.11.3Eaffected
3.11.1aEaffected
3.11.4Eaffected
3.11.3aEaffected
3.11.5Eaffected
3.11.6Eaffected
3.11.7Eaffected
3.11.8Eaffected
3.11.9Eaffected
3.11.10Eaffected
3.11.11Eaffected
3.11.12Eaffected
17.1.1affected
17.1.1aaffected
17.1.1saffected
17.1.1taffected
17.1.3affected
17.2.1affected
17.2.1raffected
17.2.1aaffected
17.2.1vaffected
17.2.2affected
17.2.3affected
17.3.1affected
17.3.2affected
17.3.3affected
17.3.1aaffected
17.3.1waffected
17.3.2aaffected
17.3.1xaffected
17.3.1zaffected
17.3.4affected
17.3.5affected
17.3.4aaffected
17.3.6affected
17.3.4baffected
17.3.4caffected
17.3.5aaffected
17.3.5baffected
17.3.7affected
17.3.8affected
17.3.8aaffected
17.4.1affected
17.4.2affected
17.4.1aaffected
17.4.1baffected
17.4.2aaffected
17.5.1affected
17.5.1aaffected
17.6.1affected
17.6.2affected
17.6.1waffected
17.6.1aaffected
17.6.1xaffected
17.6.3affected
17.6.1yaffected
17.6.1zaffected
17.6.3aaffected
17.6.4affected
17.6.1z1affected
17.6.5affected
17.6.6affected
17.6.6aaffected
17.6.5aaffected
17.6.7affected
17.6.8affected
17.6.8aaffected
17.7.1affected
17.7.1aaffected
17.7.1baffected
17.7.2affected
17.10.1affected
17.10.1aaffected
17.10.1baffected
17.8.1affected
17.8.1aaffected
17.9.1affected
17.9.1waffected
17.9.2affected
17.9.1aaffected
17.9.1xaffected
17.9.1yaffected
17.9.3affected
17.9.2aaffected
17.9.1x1affected
17.9.3aaffected
17.9.4affected
17.9.1y1affected
17.9.5affected
17.9.4aaffected
17.9.5aaffected
17.9.5baffected
17.9.6affected
17.9.6aaffected
17.9.7affected
17.9.5eaffected
17.9.5faffected
17.9.7aaffected
17.9.7baffected
17.11.1affected
17.11.1aaffected
17.12.1affected
17.12.1waffected
17.12.1aaffected
17.12.1xaffected
17.12.2affected
17.12.3affected
17.12.2aaffected
17.12.1yaffected
17.12.1zaffected
17.12.4affected
17.12.3aaffected
17.12.1z1affected
17.12.1z2affected
17.12.4aaffected
17.12.5affected
17.12.4baffected
17.12.1z3affected
17.12.5aaffected
17.12.1z4affected
17.12.5baffected
17.12.5caffected
17.13.1affected
17.13.1aaffected
17.14.1affected
17.14.1aaffected
17.11.99SWaffected
17.15.1affected
17.15.1waffected
17.15.1aaffected
17.15.2affected
17.15.1baffected
17.15.1xaffected
17.15.3affected
17.15.2caffected
17.15.2aaffected
17.15.1yaffected
17.15.2baffected
17.15.3aaffected
17.15.3baffected

References

https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ios-tacacs-hdB7thJw ↗