CVE-2025-20160

Wednesday, September 24, 2025

8.1

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

Summary

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 Software

Vendor	Product	Version Range	Status
Cisco	IOS	`15.2(6)E1`	affected
Cisco	IOS	`15.2(4)E6`	affected
Cisco	IOS	`15.2(6)E2`	affected
Cisco	IOS	`15.2(4)E7`	affected
Cisco	IOS	`15.2(7)E`	affected
Cisco	IOS	`15.2(4)E8`	affected
Cisco	IOS	`15.2(6)E2a`	affected
Cisco	IOS	`15.2(6)E2b`	affected
Cisco	IOS	`15.2(7)E1`	affected
Cisco	IOS	`15.2(7)E0a`	affected
Cisco	IOS	`15.2(7)E0b`	affected
Cisco	IOS	`15.2(7)E0s`	affected
Cisco	IOS	`15.2(6)E3`	affected
Cisco	IOS	`15.2(4)E9`	affected
Cisco	IOS	`15.2(7)E2`	affected
Cisco	IOS	`15.2(7a)E0b`	affected
Cisco	IOS	`15.2(4)E10`	affected
Cisco	IOS	`15.2(7)E3`	affected
Cisco	IOS	`15.2(7)E1a`	affected
Cisco	IOS	`15.2(7b)E0b`	affected
Cisco	IOS	`15.2(7)E2a`	affected
Cisco	IOS	`15.2(4)E10a`	affected
Cisco	IOS	`15.2(7)E4`	affected
Cisco	IOS	`15.2(7)E3k`	affected
Cisco	IOS	`15.2(8)E`	affected
Cisco	IOS	`15.2(8)E1`	affected
Cisco	IOS	`15.2(7)E5`	affected
Cisco	IOS	`15.2(7)E6`	affected
Cisco	IOS	`15.2(8)E2`	affected
Cisco	IOS	`15.2(4)E10d`	affected
Cisco	IOS	`15.2(7)E7`	affected
Cisco	IOS	`15.2(8)E3`	affected
Cisco	IOS	`15.2(7)E8`	affected
Cisco	IOS	`15.2(8)E4`	affected
Cisco	IOS	`15.2(7)E9`	affected
Cisco	IOS	`15.2(8)E5`	affected
Cisco	IOS	`15.2(8)E6`	affected
Cisco	IOS	`15.2(7)E10`	affected
Cisco	IOS	`15.2(7)E11`	affected
Cisco	IOS	`15.2(8)E7`	affected
Cisco	IOS	`15.2(7)E12`	affected
Cisco	IOS	`15.5(3)S8`	affected
Cisco	IOS	`15.5(3)S9`	affected
Cisco	IOS	`15.5(3)S10`	affected
Cisco	IOS	`15.5(3)S9a`	affected
Cisco	IOS	`15.2(6)EB`	affected
Cisco	IOS	`15.5(3)M7`	affected
Cisco	IOS	`15.5(3)M8`	affected
Cisco	IOS	`15.5(3)M9`	affected
Cisco	IOS	`15.5(3)M10`	affected
Cisco	IOS	`15.6(2)SP5`	affected
Cisco	IOS	`15.6(2)SP6`	affected
Cisco	IOS	`15.6(2)SP7`	affected
Cisco	IOS	`15.6(2)SP8`	affected
Cisco	IOS	`15.6(2)SP9`	affected
Cisco	IOS	`15.6(3)M4`	affected
Cisco	IOS	`15.6(3)M5`	affected
Cisco	IOS	`15.6(3)M6`	affected
Cisco	IOS	`15.6(3)M7`	affected
Cisco	IOS	`15.6(3)M6a`	affected
Cisco	IOS	`15.6(3)M6b`	affected
Cisco	IOS	`15.6(3)M8`	affected
Cisco	IOS	`15.6(3)M9`	affected
Cisco	IOS	`15.5(1)SY2`	affected
Cisco	IOS	`15.5(1)SY3`	affected
Cisco	IOS	`15.5(1)SY4`	affected
Cisco	IOS	`15.5(1)SY5`	affected
Cisco	IOS	`15.5(1)SY6`	affected
Cisco	IOS	`15.5(1)SY7`	affected
Cisco	IOS	`15.5(1)SY8`	affected
Cisco	IOS	`15.5(1)SY9`	affected
Cisco	IOS	`15.5(1)SY10`	affected
Cisco	IOS	`15.5(1)SY11`	affected
Cisco	IOS	`15.5(1)SY12`	affected
Cisco	IOS	`15.5(1)SY13`	affected
Cisco	IOS	`15.5(1)SY14`	affected
Cisco	IOS	`15.5(1)SY15`	affected
Cisco	IOS	`15.7(3)M3`	affected
Cisco	IOS	`15.7(3)M2`	affected
Cisco	IOS	`15.7(3)M4`	affected
Cisco	IOS	`15.7(3)M5`	affected
Cisco	IOS	`15.7(3)M4a`	affected
Cisco	IOS	`15.7(3)M4b`	affected
Cisco	IOS	`15.7(3)M6`	affected
Cisco	IOS	`15.7(3)M7`	affected
Cisco	IOS	`15.7(3)M8`	affected
Cisco	IOS	`15.7(3)M9`	affected
Cisco	IOS	`15.8(3)M`	affected
Cisco	IOS	`15.8(3)M1`	affected
Cisco	IOS	`15.8(3)M0a`	affected
Cisco	IOS	`15.8(3)M0b`	affected
Cisco	IOS	`15.8(3)M2`	affected
Cisco	IOS	`15.8(3)M1a`	affected
Cisco	IOS	`15.8(3)M3`	affected
Cisco	IOS	`15.8(3)M2a`	affected
Cisco	IOS	`15.8(3)M4`	affected
Cisco	IOS	`15.8(3)M3a`	affected
Cisco	IOS	`15.8(3)M3b`	affected
Cisco	IOS	`15.8(3)M5`	affected
Cisco	IOS	`15.8(3)M6`	affected
Cisco	IOS	`15.8(3)M7`	affected
Cisco	IOS	`15.8(3)M8`	affected
Cisco	IOS	`15.8(3)M9`	affected
Cisco	IOS	`15.9(3)M`	affected
Cisco	IOS	`15.9(3)M1`	affected
Cisco	IOS	`15.9(3)M0a`	affected
Cisco	IOS	`15.9(3)M2`	affected
Cisco	IOS	`15.9(3)M3`	affected
Cisco	IOS	`15.9(3)M2a`	affected
Cisco	IOS	`15.9(3)M3a`	affected
Cisco	IOS	`15.9(3)M4`	affected
Cisco	IOS	`15.9(3)M3b`	affected
Cisco	IOS	`15.9(3)M5`	affected
Cisco	IOS	`15.9(3)M4a`	affected
Cisco	IOS	`15.9(3)M6`	affected
Cisco	IOS	`15.9(3)M7`	affected
Cisco	IOS	`15.9(3)M6a`	affected
Cisco	IOS	`15.9(3)M6b`	affected
Cisco	IOS	`15.9(3)M8`	affected
Cisco	IOS	`15.9(3)M7a`	affected
Cisco	IOS	`15.9(3)M9`	affected
Cisco	IOS	`15.9(3)M8b`	affected
Cisco	IOS	`15.9(3)M10`	affected
Cisco	IOS	`15.9(3)M11`	affected
Cisco	Cisco IOS XE Software	`3.16.8S`	affected
Cisco	Cisco IOS XE Software	`3.16.9S`	affected
Cisco	Cisco IOS XE Software	`3.16.10S`	affected
Cisco	Cisco IOS XE Software	`3.8.6E`	affected
Cisco	Cisco IOS XE Software	`3.8.7E`	affected
Cisco	Cisco IOS XE Software	`3.8.8E`	affected
Cisco	Cisco IOS XE Software	`3.8.9E`	affected
Cisco	Cisco IOS XE Software	`3.8.10E`	affected
Cisco	Cisco IOS XE Software	`3.18.5SP`	affected
Cisco	Cisco IOS XE Software	`3.18.6SP`	affected
Cisco	Cisco IOS XE Software	`3.18.7SP`	affected
Cisco	Cisco IOS XE Software	`3.18.8aSP`	affected
Cisco	Cisco IOS XE Software	`3.18.9SP`	affected
Cisco	Cisco IOS XE Software	`16.6.5`	affected
Cisco	Cisco IOS XE Software	`16.6.5a`	affected
Cisco	Cisco IOS XE Software	`16.6.6`	affected
Cisco	Cisco IOS XE Software	`16.6.7`	affected
Cisco	Cisco IOS XE Software	`16.6.8`	affected
Cisco	Cisco IOS XE Software	`16.6.9`	affected
Cisco	Cisco IOS XE Software	`16.6.10`	affected
Cisco	Cisco IOS XE Software	`16.8.1`	affected
Cisco	Cisco IOS XE Software	`16.8.1a`	affected
Cisco	Cisco IOS XE Software	`16.8.1b`	affected
Cisco	Cisco IOS XE Software	`16.8.1s`	affected
Cisco	Cisco IOS XE Software	`16.8.1c`	affected
Cisco	Cisco IOS XE Software	`16.8.1d`	affected
Cisco	Cisco IOS XE Software	`16.8.2`	affected
Cisco	Cisco IOS XE Software	`16.8.1e`	affected
Cisco	Cisco IOS XE Software	`16.8.3`	affected
Cisco	Cisco IOS XE Software	`16.9.1`	affected
Cisco	Cisco IOS XE Software	`16.9.2`	affected
Cisco	Cisco IOS XE Software	`16.9.1a`	affected
Cisco	Cisco IOS XE Software	`16.9.1b`	affected
Cisco	Cisco IOS XE Software	`16.9.1s`	affected
Cisco	Cisco IOS XE Software	`16.9.3`	affected
Cisco	Cisco IOS XE Software	`16.9.4`	affected
Cisco	Cisco IOS XE Software	`16.9.3a`	affected
Cisco	Cisco IOS XE Software	`16.9.5`	affected
Cisco	Cisco IOS XE Software	`16.9.5f`	affected
Cisco	Cisco IOS XE Software	`16.9.6`	affected
Cisco	Cisco IOS XE Software	`16.9.7`	affected
Cisco	Cisco IOS XE Software	`16.9.8`	affected
Cisco	Cisco IOS XE Software	`16.10.1`	affected
Cisco	Cisco IOS XE Software	`16.10.1a`	affected
Cisco	Cisco IOS XE Software	`16.10.1b`	affected
Cisco	Cisco IOS XE Software	`16.10.1s`	affected
Cisco	Cisco IOS XE Software	`16.10.1c`	affected
Cisco	Cisco IOS XE Software	`16.10.1e`	affected
Cisco	Cisco IOS XE Software	`16.10.1d`	affected
Cisco	Cisco IOS XE Software	`16.10.2`	affected
Cisco	Cisco IOS XE Software	`16.10.1f`	affected
Cisco	Cisco IOS XE Software	`16.10.1g`	affected
Cisco	Cisco IOS XE Software	`16.10.3`	affected
Cisco	Cisco IOS XE Software	`3.10.1E`	affected
Cisco	Cisco IOS XE Software	`3.10.2E`	affected
Cisco	Cisco IOS XE Software	`3.10.3E`	affected
Cisco	Cisco IOS XE Software	`16.11.1`	affected
Cisco	Cisco IOS XE Software	`16.11.1a`	affected
Cisco	Cisco IOS XE Software	`16.11.1b`	affected
Cisco	Cisco IOS XE Software	`16.11.2`	affected
Cisco	Cisco IOS XE Software	`16.11.1s`	affected
Cisco	Cisco IOS XE Software	`16.12.1`	affected
Cisco	Cisco IOS XE Software	`16.12.1s`	affected
Cisco	Cisco IOS XE Software	`16.12.1a`	affected
Cisco	Cisco IOS XE Software	`16.12.1c`	affected
Cisco	Cisco IOS XE Software	`16.12.1w`	affected
Cisco	Cisco IOS XE Software	`16.12.2`	affected
Cisco	Cisco IOS XE Software	`16.12.1y`	affected
Cisco	Cisco IOS XE Software	`16.12.2a`	affected
Cisco	Cisco IOS XE Software	`16.12.3`	affected
Cisco	Cisco IOS XE Software	`16.12.8`	affected
Cisco	Cisco IOS XE Software	`16.12.2s`	affected
Cisco	Cisco IOS XE Software	`16.12.1x`	affected
Cisco	Cisco IOS XE Software	`16.12.1t`	affected
Cisco	Cisco IOS XE Software	`16.12.4`	affected
Cisco	Cisco IOS XE Software	`16.12.3s`	affected
Cisco	Cisco IOS XE Software	`16.12.3a`	affected
Cisco	Cisco IOS XE Software	`16.12.4a`	affected
Cisco	Cisco IOS XE Software	`16.12.5`	affected
Cisco	Cisco IOS XE Software	`16.12.6`	affected
Cisco	Cisco IOS XE Software	`16.12.1z1`	affected
Cisco	Cisco IOS XE Software	`16.12.5a`	affected
Cisco	Cisco IOS XE Software	`16.12.5b`	affected
Cisco	Cisco IOS XE Software	`16.12.1z2`	affected
Cisco	Cisco IOS XE Software	`16.12.6a`	affected
Cisco	Cisco IOS XE Software	`16.12.7`	affected
Cisco	Cisco IOS XE Software	`16.12.9`	affected
Cisco	Cisco IOS XE Software	`16.12.10`	affected
Cisco	Cisco IOS XE Software	`16.12.10a`	affected
Cisco	Cisco IOS XE Software	`16.12.11`	affected
Cisco	Cisco IOS XE Software	`16.12.12`	affected
Cisco	Cisco IOS XE Software	`16.12.13`	affected
Cisco	Cisco IOS XE Software	`3.11.0E`	affected
Cisco	Cisco IOS XE Software	`3.11.1E`	affected
Cisco	Cisco IOS XE Software	`3.11.2E`	affected
Cisco	Cisco IOS XE Software	`3.11.3E`	affected
Cisco	Cisco IOS XE Software	`3.11.1aE`	affected
Cisco	Cisco IOS XE Software	`3.11.4E`	affected
Cisco	Cisco IOS XE Software	`3.11.3aE`	affected
Cisco	Cisco IOS XE Software	`3.11.5E`	affected
Cisco	Cisco IOS XE Software	`3.11.6E`	affected
Cisco	Cisco IOS XE Software	`3.11.7E`	affected
Cisco	Cisco IOS XE Software	`3.11.8E`	affected
Cisco	Cisco IOS XE Software	`3.11.9E`	affected
Cisco	Cisco IOS XE Software	`3.11.10E`	affected
Cisco	Cisco IOS XE Software	`3.11.11E`	affected
Cisco	Cisco IOS XE Software	`3.11.12E`	affected
Cisco	Cisco IOS XE Software	`17.1.1`	affected
Cisco	Cisco IOS XE Software	`17.1.1a`	affected
Cisco	Cisco IOS XE Software	`17.1.1s`	affected
Cisco	Cisco IOS XE Software	`17.1.1t`	affected
Cisco	Cisco IOS XE Software	`17.1.3`	affected
Cisco	Cisco IOS XE Software	`17.2.1`	affected
Cisco	Cisco IOS XE Software	`17.2.1r`	affected
Cisco	Cisco IOS XE Software	`17.2.1a`	affected
Cisco	Cisco IOS XE Software	`17.2.1v`	affected
Cisco	Cisco IOS XE Software	`17.2.2`	affected
Cisco	Cisco IOS XE Software	`17.2.3`	affected
Cisco	Cisco IOS XE Software	`17.3.1`	affected
Cisco	Cisco IOS XE Software	`17.3.2`	affected
Cisco	Cisco IOS XE Software	`17.3.3`	affected
Cisco	Cisco IOS XE Software	`17.3.1a`	affected
Cisco	Cisco IOS XE Software	`17.3.1w`	affected
Cisco	Cisco IOS XE Software	`17.3.2a`	affected
Cisco	Cisco IOS XE Software	`17.3.1x`	affected
Cisco	Cisco IOS XE Software	`17.3.1z`	affected
Cisco	Cisco IOS XE Software	`17.3.4`	affected
Cisco	Cisco IOS XE Software	`17.3.5`	affected
Cisco	Cisco IOS XE Software	`17.3.4a`	affected
Cisco	Cisco IOS XE Software	`17.3.6`	affected
Cisco	Cisco IOS XE Software	`17.3.4b`	affected
Cisco	Cisco IOS XE Software	`17.3.4c`	affected
Cisco	Cisco IOS XE Software	`17.3.5a`	affected
Cisco	Cisco IOS XE Software	`17.3.5b`	affected
Cisco	Cisco IOS XE Software	`17.3.7`	affected
Cisco	Cisco IOS XE Software	`17.3.8`	affected
Cisco	Cisco IOS XE Software	`17.3.8a`	affected
Cisco	Cisco IOS XE Software	`17.4.1`	affected
Cisco	Cisco IOS XE Software	`17.4.2`	affected
Cisco	Cisco IOS XE Software	`17.4.1a`	affected
Cisco	Cisco IOS XE Software	`17.4.1b`	affected
Cisco	Cisco IOS XE Software	`17.4.2a`	affected
Cisco	Cisco IOS XE Software	`17.5.1`	affected
Cisco	Cisco IOS XE Software	`17.5.1a`	affected
Cisco	Cisco IOS XE Software	`17.6.1`	affected
Cisco	Cisco IOS XE Software	`17.6.2`	affected
Cisco	Cisco IOS XE Software	`17.6.1w`	affected
Cisco	Cisco IOS XE Software	`17.6.1a`	affected
Cisco	Cisco IOS XE Software	`17.6.1x`	affected
Cisco	Cisco IOS XE Software	`17.6.3`	affected
Cisco	Cisco IOS XE Software	`17.6.1y`	affected
Cisco	Cisco IOS XE Software	`17.6.1z`	affected
Cisco	Cisco IOS XE Software	`17.6.3a`	affected
Cisco	Cisco IOS XE Software	`17.6.4`	affected
Cisco	Cisco IOS XE Software	`17.6.1z1`	affected
Cisco	Cisco IOS XE Software	`17.6.5`	affected
Cisco	Cisco IOS XE Software	`17.6.6`	affected
Cisco	Cisco IOS XE Software	`17.6.6a`	affected
Cisco	Cisco IOS XE Software	`17.6.5a`	affected
Cisco	Cisco IOS XE Software	`17.6.7`	affected
Cisco	Cisco IOS XE Software	`17.6.8`	affected
Cisco	Cisco IOS XE Software	`17.6.8a`	affected
Cisco	Cisco IOS XE Software	`17.7.1`	affected
Cisco	Cisco IOS XE Software	`17.7.1a`	affected
Cisco	Cisco IOS XE Software	`17.7.1b`	affected
Cisco	Cisco IOS XE Software	`17.7.2`	affected
Cisco	Cisco IOS XE Software	`17.10.1`	affected
Cisco	Cisco IOS XE Software	`17.10.1a`	affected
Cisco	Cisco IOS XE Software	`17.10.1b`	affected
Cisco	Cisco IOS XE Software	`17.8.1`	affected
Cisco	Cisco IOS XE Software	`17.8.1a`	affected
Cisco	Cisco IOS XE Software	`17.9.1`	affected
Cisco	Cisco IOS XE Software	`17.9.1w`	affected
Cisco	Cisco IOS XE Software	`17.9.2`	affected
Cisco	Cisco IOS XE Software	`17.9.1a`	affected
Cisco	Cisco IOS XE Software	`17.9.1x`	affected
Cisco	Cisco IOS XE Software	`17.9.1y`	affected
Cisco	Cisco IOS XE Software	`17.9.3`	affected
Cisco	Cisco IOS XE Software	`17.9.2a`	affected
Cisco	Cisco IOS XE Software	`17.9.1x1`	affected
Cisco	Cisco IOS XE Software	`17.9.3a`	affected
Cisco	Cisco IOS XE Software	`17.9.4`	affected
Cisco	Cisco IOS XE Software	`17.9.1y1`	affected
Cisco	Cisco IOS XE Software	`17.9.5`	affected
Cisco	Cisco IOS XE Software	`17.9.4a`	affected
Cisco	Cisco IOS XE Software	`17.9.5a`	affected
Cisco	Cisco IOS XE Software	`17.9.5b`	affected
Cisco	Cisco IOS XE Software	`17.9.6`	affected
Cisco	Cisco IOS XE Software	`17.9.6a`	affected
Cisco	Cisco IOS XE Software	`17.9.7`	affected
Cisco	Cisco IOS XE Software	`17.9.5e`	affected
Cisco	Cisco IOS XE Software	`17.9.5f`	affected
Cisco	Cisco IOS XE Software	`17.9.7a`	affected
Cisco	Cisco IOS XE Software	`17.9.7b`	affected
Cisco	Cisco IOS XE Software	`17.11.1`	affected
Cisco	Cisco IOS XE Software	`17.11.1a`	affected
Cisco	Cisco IOS XE Software	`17.12.1`	affected
Cisco	Cisco IOS XE Software	`17.12.1w`	affected
Cisco	Cisco IOS XE Software	`17.12.1a`	affected
Cisco	Cisco IOS XE Software	`17.12.1x`	affected
Cisco	Cisco IOS XE Software	`17.12.2`	affected
Cisco	Cisco IOS XE Software	`17.12.3`	affected
Cisco	Cisco IOS XE Software	`17.12.2a`	affected
Cisco	Cisco IOS XE Software	`17.12.1y`	affected
Cisco	Cisco IOS XE Software	`17.12.1z`	affected
Cisco	Cisco IOS XE Software	`17.12.4`	affected
Cisco	Cisco IOS XE Software	`17.12.3a`	affected
Cisco	Cisco IOS XE Software	`17.12.1z1`	affected
Cisco	Cisco IOS XE Software	`17.12.1z2`	affected
Cisco	Cisco IOS XE Software	`17.12.4a`	affected
Cisco	Cisco IOS XE Software	`17.12.5`	affected
Cisco	Cisco IOS XE Software	`17.12.4b`	affected
Cisco	Cisco IOS XE Software	`17.12.1z3`	affected
Cisco	Cisco IOS XE Software	`17.12.5a`	affected
Cisco	Cisco IOS XE Software	`17.12.1z4`	affected
Cisco	Cisco IOS XE Software	`17.12.5b`	affected
Cisco	Cisco IOS XE Software	`17.12.5c`	affected
Cisco	Cisco IOS XE Software	`17.13.1`	affected
Cisco	Cisco IOS XE Software	`17.13.1a`	affected
Cisco	Cisco IOS XE Software	`17.14.1`	affected
Cisco	Cisco IOS XE Software	`17.14.1a`	affected
Cisco	Cisco IOS XE Software	`17.11.99SW`	affected
Cisco	Cisco IOS XE Software	`17.15.1`	affected
Cisco	Cisco IOS XE Software	`17.15.1w`	affected
Cisco	Cisco IOS XE Software	`17.15.1a`	affected
Cisco	Cisco IOS XE Software	`17.15.2`	affected
Cisco	Cisco IOS XE Software	`17.15.1b`	affected
Cisco	Cisco IOS XE Software	`17.15.1x`	affected
Cisco	Cisco IOS XE Software	`17.15.3`	affected
Cisco	Cisco IOS XE Software	`17.15.2c`	affected
Cisco	Cisco IOS XE Software	`17.15.2a`	affected
Cisco	Cisco IOS XE Software	`17.15.1y`	affected
Cisco	Cisco IOS XE Software	`17.15.2b`	affected
Cisco	Cisco IOS XE Software	`17.15.3a`	affected
Cisco	Cisco IOS XE Software	`17.15.3b`	affected

Weaknesses

CWE-287: Improper Authentication

ADP Enrichment

CISA ADP Vulnrichment

SSVC:
Exploitation: none
- Automatable: no
- Technical Impact: total

References

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

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