CVE-2025-20160 (GCVE-0-2025-20160)
Vulnerability from cvelistv5
Published
2025-09-24 17:10
Modified
2026-02-26 17:48
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- CWE-287 - Improper Authentication
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.
References
Impacted products
| Vendor | Product | Version | |||||||
|---|---|---|---|---|---|---|---|---|---|
| Cisco | IOS |
Version: 15.2(6)E1 Version: 15.2(4)E6 Version: 15.2(6)E2 Version: 15.2(4)E7 Version: 15.2(7)E Version: 15.2(4)E8 Version: 15.2(6)E2a Version: 15.2(6)E2b Version: 15.2(7)E1 Version: 15.2(7)E0a Version: 15.2(7)E0b Version: 15.2(7)E0s Version: 15.2(6)E3 Version: 15.2(4)E9 Version: 15.2(7)E2 Version: 15.2(7a)E0b Version: 15.2(4)E10 Version: 15.2(7)E3 Version: 15.2(7)E1a Version: 15.2(7b)E0b Version: 15.2(7)E2a Version: 15.2(4)E10a Version: 15.2(7)E4 Version: 15.2(7)E3k Version: 15.2(8)E Version: 15.2(8)E1 Version: 15.2(7)E5 Version: 15.2(7)E6 Version: 15.2(8)E2 Version: 15.2(4)E10d Version: 15.2(7)E7 Version: 15.2(8)E3 Version: 15.2(7)E8 Version: 15.2(8)E4 Version: 15.2(7)E9 Version: 15.2(8)E5 Version: 15.2(8)E6 Version: 15.2(7)E10 Version: 15.2(7)E11 Version: 15.2(8)E7 Version: 15.2(7)E12 Version: 15.5(3)S8 Version: 15.5(3)S9 Version: 15.5(3)S10 Version: 15.5(3)S9a Version: 15.2(6)EB Version: 15.5(3)M7 Version: 15.5(3)M8 Version: 15.5(3)M9 Version: 15.5(3)M10 Version: 15.6(2)SP5 Version: 15.6(2)SP6 Version: 15.6(2)SP7 Version: 15.6(2)SP8 Version: 15.6(2)SP9 Version: 15.6(3)M4 Version: 15.6(3)M5 Version: 15.6(3)M6 Version: 15.6(3)M7 Version: 15.6(3)M6a Version: 15.6(3)M6b Version: 15.6(3)M8 Version: 15.6(3)M9 Version: 15.5(1)SY2 Version: 15.5(1)SY3 Version: 15.5(1)SY4 Version: 15.5(1)SY5 Version: 15.5(1)SY6 Version: 15.5(1)SY7 Version: 15.5(1)SY8 Version: 15.5(1)SY9 Version: 15.5(1)SY10 Version: 15.5(1)SY11 Version: 15.5(1)SY12 Version: 15.5(1)SY13 Version: 15.5(1)SY14 Version: 15.5(1)SY15 Version: 15.7(3)M3 Version: 15.7(3)M2 Version: 15.7(3)M4 Version: 15.7(3)M5 Version: 15.7(3)M4a Version: 15.7(3)M4b Version: 15.7(3)M6 Version: 15.7(3)M7 Version: 15.7(3)M8 Version: 15.7(3)M9 Version: 15.8(3)M Version: 15.8(3)M1 Version: 15.8(3)M0a Version: 15.8(3)M0b Version: 15.8(3)M2 Version: 15.8(3)M1a Version: 15.8(3)M3 Version: 15.8(3)M2a Version: 15.8(3)M4 Version: 15.8(3)M3a Version: 15.8(3)M3b Version: 15.8(3)M5 Version: 15.8(3)M6 Version: 15.8(3)M7 Version: 15.8(3)M8 Version: 15.8(3)M9 Version: 15.9(3)M Version: 15.9(3)M1 Version: 15.9(3)M0a Version: 15.9(3)M2 Version: 15.9(3)M3 Version: 15.9(3)M2a Version: 15.9(3)M3a Version: 15.9(3)M4 Version: 15.9(3)M3b Version: 15.9(3)M5 Version: 15.9(3)M4a Version: 15.9(3)M6 Version: 15.9(3)M7 Version: 15.9(3)M6a Version: 15.9(3)M6b Version: 15.9(3)M8 Version: 15.9(3)M7a Version: 15.9(3)M9 Version: 15.9(3)M8b Version: 15.9(3)M10 Version: 15.9(3)M11 |
|||||||
|
|||||||||
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"timestamp": "2025-09-25T03:56:03.259249Z",
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"version": "3.11.3aE"
},
{
"status": "affected",
"version": "3.11.5E"
},
{
"status": "affected",
"version": "3.11.6E"
},
{
"status": "affected",
"version": "3.11.7E"
},
{
"status": "affected",
"version": "3.11.8E"
},
{
"status": "affected",
"version": "3.11.9E"
},
{
"status": "affected",
"version": "3.11.10E"
},
{
"status": "affected",
"version": "3.11.11E"
},
{
"status": "affected",
"version": "3.11.12E"
},
{
"status": "affected",
"version": "17.1.1"
},
{
"status": "affected",
"version": "17.1.1a"
},
{
"status": "affected",
"version": "17.1.1s"
},
{
"status": "affected",
"version": "17.1.1t"
},
{
"status": "affected",
"version": "17.1.3"
},
{
"status": "affected",
"version": "17.2.1"
},
{
"status": "affected",
"version": "17.2.1r"
},
{
"status": "affected",
"version": "17.2.1a"
},
{
"status": "affected",
"version": "17.2.1v"
},
{
"status": "affected",
"version": "17.2.2"
},
{
"status": "affected",
"version": "17.2.3"
},
{
"status": "affected",
"version": "17.3.1"
},
{
"status": "affected",
"version": "17.3.2"
},
{
"status": "affected",
"version": "17.3.3"
},
{
"status": "affected",
"version": "17.3.1a"
},
{
"status": "affected",
"version": "17.3.1w"
},
{
"status": "affected",
"version": "17.3.2a"
},
{
"status": "affected",
"version": "17.3.1x"
},
{
"status": "affected",
"version": "17.3.1z"
},
{
"status": "affected",
"version": "17.3.4"
},
{
"status": "affected",
"version": "17.3.5"
},
{
"status": "affected",
"version": "17.3.4a"
},
{
"status": "affected",
"version": "17.3.6"
},
{
"status": "affected",
"version": "17.3.4b"
},
{
"status": "affected",
"version": "17.3.4c"
},
{
"status": "affected",
"version": "17.3.5a"
},
{
"status": "affected",
"version": "17.3.5b"
},
{
"status": "affected",
"version": "17.3.7"
},
{
"status": "affected",
"version": "17.3.8"
},
{
"status": "affected",
"version": "17.3.8a"
},
{
"status": "affected",
"version": "17.4.1"
},
{
"status": "affected",
"version": "17.4.2"
},
{
"status": "affected",
"version": "17.4.1a"
},
{
"status": "affected",
"version": "17.4.1b"
},
{
"status": "affected",
"version": "17.4.2a"
},
{
"status": "affected",
"version": "17.5.1"
},
{
"status": "affected",
"version": "17.5.1a"
},
{
"status": "affected",
"version": "17.6.1"
},
{
"status": "affected",
"version": "17.6.2"
},
{
"status": "affected",
"version": "17.6.1w"
},
{
"status": "affected",
"version": "17.6.1a"
},
{
"status": "affected",
"version": "17.6.1x"
},
{
"status": "affected",
"version": "17.6.3"
},
{
"status": "affected",
"version": "17.6.1y"
},
{
"status": "affected",
"version": "17.6.1z"
},
{
"status": "affected",
"version": "17.6.3a"
},
{
"status": "affected",
"version": "17.6.4"
},
{
"status": "affected",
"version": "17.6.1z1"
},
{
"status": "affected",
"version": "17.6.5"
},
{
"status": "affected",
"version": "17.6.6"
},
{
"status": "affected",
"version": "17.6.6a"
},
{
"status": "affected",
"version": "17.6.5a"
},
{
"status": "affected",
"version": "17.6.7"
},
{
"status": "affected",
"version": "17.6.8"
},
{
"status": "affected",
"version": "17.6.8a"
},
{
"status": "affected",
"version": "17.7.1"
},
{
"status": "affected",
"version": "17.7.1a"
},
{
"status": "affected",
"version": "17.7.1b"
},
{
"status": "affected",
"version": "17.7.2"
},
{
"status": "affected",
"version": "17.10.1"
},
{
"status": "affected",
"version": "17.10.1a"
},
{
"status": "affected",
"version": "17.10.1b"
},
{
"status": "affected",
"version": "17.8.1"
},
{
"status": "affected",
"version": "17.8.1a"
},
{
"status": "affected",
"version": "17.9.1"
},
{
"status": "affected",
"version": "17.9.1w"
},
{
"status": "affected",
"version": "17.9.2"
},
{
"status": "affected",
"version": "17.9.1a"
},
{
"status": "affected",
"version": "17.9.1x"
},
{
"status": "affected",
"version": "17.9.1y"
},
{
"status": "affected",
"version": "17.9.3"
},
{
"status": "affected",
"version": "17.9.2a"
},
{
"status": "affected",
"version": "17.9.1x1"
},
{
"status": "affected",
"version": "17.9.3a"
},
{
"status": "affected",
"version": "17.9.4"
},
{
"status": "affected",
"version": "17.9.1y1"
},
{
"status": "affected",
"version": "17.9.5"
},
{
"status": "affected",
"version": "17.9.4a"
},
{
"status": "affected",
"version": "17.9.5a"
},
{
"status": "affected",
"version": "17.9.5b"
},
{
"status": "affected",
"version": "17.9.6"
},
{
"status": "affected",
"version": "17.9.6a"
},
{
"status": "affected",
"version": "17.9.7"
},
{
"status": "affected",
"version": "17.9.5e"
},
{
"status": "affected",
"version": "17.9.5f"
},
{
"status": "affected",
"version": "17.9.7a"
},
{
"status": "affected",
"version": "17.9.7b"
},
{
"status": "affected",
"version": "17.11.1"
},
{
"status": "affected",
"version": "17.11.1a"
},
{
"status": "affected",
"version": "17.12.1"
},
{
"status": "affected",
"version": "17.12.1w"
},
{
"status": "affected",
"version": "17.12.1a"
},
{
"status": "affected",
"version": "17.12.1x"
},
{
"status": "affected",
"version": "17.12.2"
},
{
"status": "affected",
"version": "17.12.3"
},
{
"status": "affected",
"version": "17.12.2a"
},
{
"status": "affected",
"version": "17.12.1y"
},
{
"status": "affected",
"version": "17.12.1z"
},
{
"status": "affected",
"version": "17.12.4"
},
{
"status": "affected",
"version": "17.12.3a"
},
{
"status": "affected",
"version": "17.12.1z1"
},
{
"status": "affected",
"version": "17.12.1z2"
},
{
"status": "affected",
"version": "17.12.4a"
},
{
"status": "affected",
"version": "17.12.5"
},
{
"status": "affected",
"version": "17.12.4b"
},
{
"status": "affected",
"version": "17.12.1z3"
},
{
"status": "affected",
"version": "17.12.5a"
},
{
"status": "affected",
"version": "17.12.1z4"
},
{
"status": "affected",
"version": "17.12.5b"
},
{
"status": "affected",
"version": "17.12.5c"
},
{
"status": "affected",
"version": "17.13.1"
},
{
"status": "affected",
"version": "17.13.1a"
},
{
"status": "affected",
"version": "17.14.1"
},
{
"status": "affected",
"version": "17.14.1a"
},
{
"status": "affected",
"version": "17.11.99SW"
},
{
"status": "affected",
"version": "17.15.1"
},
{
"status": "affected",
"version": "17.15.1w"
},
{
"status": "affected",
"version": "17.15.1a"
},
{
"status": "affected",
"version": "17.15.2"
},
{
"status": "affected",
"version": "17.15.1b"
},
{
"status": "affected",
"version": "17.15.1x"
},
{
"status": "affected",
"version": "17.15.3"
},
{
"status": "affected",
"version": "17.15.2c"
},
{
"status": "affected",
"version": "17.15.2a"
},
{
"status": "affected",
"version": "17.15.1y"
},
{
"status": "affected",
"version": "17.15.2b"
},
{
"status": "affected",
"version": "17.15.3a"
},
{
"status": "affected",
"version": "17.15.3b"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "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. \r\n\r 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."
}
],
"exploits": [
{
"lang": "en",
"value": "The Cisco Product Security Incident Response Team (PSIRT) is not aware of any public announcements or malicious use of the vulnerability that is described in this advisory."
}
],
"metrics": [
{
"cvssV3_1": {
"attackComplexity": "HIGH",
"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 8.1,
"baseSeverity": "HIGH",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H",
"version": "3.1"
},
"format": "cvssV3_1"
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-287",
"description": "Improper Authentication",
"lang": "en",
"type": "cwe"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2025-10-01T16:49:08.602Z",
"orgId": "d1c1063e-7a18-46af-9102-31f8928bc633",
"shortName": "cisco"
},
"references": [
{
"name": "cisco-sa-ios-tacacs-hdB7thJw",
"url": "https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ios-tacacs-hdB7thJw"
}
],
"source": {
"advisory": "cisco-sa-ios-tacacs-hdB7thJw",
"defects": [
"CSCwm99306"
],
"discovery": "INTERNAL"
}
}
},
"cveMetadata": {
"assignerOrgId": "d1c1063e-7a18-46af-9102-31f8928bc633",
"assignerShortName": "cisco",
"cveId": "CVE-2025-20160",
"datePublished": "2025-09-24T17:10:22.652Z",
"dateReserved": "2024-10-10T19:15:13.217Z",
"dateUpdated": "2026-02-26T17:48:03.600Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.
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