FKIE_CVE-2025-20160

Vulnerability from fkie_nvd - Published: 2025-09-24 18:15 - Updated: 2026-06-17 08:40
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.
Impacted products
Vendor Product Version

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "IOS",
          "vendor": "Cisco",
          "versions": [
            {
              "status": "affected",
              "version": "15.2(6)E1"
            },
            {
              "status": "affected",
              "version": "15.2(4)E6"
            },
            {
              "status": "affected",
              "version": "15.2(6)E2"
            },
            {
              "status": "affected",
              "version": "15.2(4)E7"
            },
            {
              "status": "affected",
              "version": "15.2(7)E"
            },
            {
              "status": "affected",
              "version": "15.2(4)E8"
            },
            {
              "status": "affected",
              "version": "15.2(6)E2a"
            },
            {
              "status": "affected",
              "version": "15.2(6)E2b"
            },
            {
              "status": "affected",
              "version": "15.2(7)E1"
            },
            {
              "status": "affected",
              "version": "15.2(7)E0a"
            },
            {
              "status": "affected",
              "version": "15.2(7)E0b"
            },
            {
              "status": "affected",
              "version": "15.2(7)E0s"
            },
            {
              "status": "affected",
              "version": "15.2(6)E3"
            },
            {
              "status": "affected",
              "version": "15.2(4)E9"
            },
            {
              "status": "affected",
              "version": "15.2(7)E2"
            },
            {
              "status": "affected",
              "version": "15.2(7a)E0b"
            },
            {
              "status": "affected",
              "version": "15.2(4)E10"
            },
            {
              "status": "affected",
              "version": "15.2(7)E3"
            },
            {
              "status": "affected",
              "version": "15.2(7)E1a"
            },
            {
              "status": "affected",
              "version": "15.2(7b)E0b"
            },
            {
              "status": "affected",
              "version": "15.2(7)E2a"
            },
            {
              "status": "affected",
              "version": "15.2(4)E10a"
            },
            {
              "status": "affected",
              "version": "15.2(7)E4"
            },
            {
              "status": "affected",
              "version": "15.2(7)E3k"
            },
            {
              "status": "affected",
              "version": "15.2(8)E"
            },
            {
              "status": "affected",
              "version": "15.2(8)E1"
            },
            {
              "status": "affected",
              "version": "15.2(7)E5"
            },
            {
              "status": "affected",
              "version": "15.2(7)E6"
            },
            {
              "status": "affected",
              "version": "15.2(8)E2"
            },
            {
              "status": "affected",
              "version": "15.2(4)E10d"
            },
            {
              "status": "affected",
              "version": "15.2(7)E7"
            },
            {
              "status": "affected",
              "version": "15.2(8)E3"
            },
            {
              "status": "affected",
              "version": "15.2(7)E8"
            },
            {
              "status": "affected",
              "version": "15.2(8)E4"
            },
            {
              "status": "affected",
              "version": "15.2(7)E9"
            },
            {
              "status": "affected",
              "version": "15.2(8)E5"
            },
            {
              "status": "affected",
              "version": "15.2(8)E6"
            },
            {
              "status": "affected",
              "version": "15.2(7)E10"
            },
            {
              "status": "affected",
              "version": "15.2(7)E11"
            },
            {
              "status": "affected",
              "version": "15.2(8)E7"
            },
            {
              "status": "affected",
              "version": "15.2(7)E12"
            },
            {
              "status": "affected",
              "version": "15.5(3)S8"
            },
            {
              "status": "affected",
              "version": "15.5(3)S9"
            },
            {
              "status": "affected",
              "version": "15.5(3)S10"
            },
            {
              "status": "affected",
              "version": "15.5(3)S9a"
            },
            {
              "status": "affected",
              "version": "15.2(6)EB"
            },
            {
              "status": "affected",
              "version": "15.5(3)M7"
            },
            {
              "status": "affected",
              "version": "15.5(3)M8"
            },
            {
              "status": "affected",
              "version": "15.5(3)M9"
            },
            {
              "status": "affected",
              "version": "15.5(3)M10"
            },
            {
              "status": "affected",
              "version": "15.6(2)SP5"
            },
            {
              "status": "affected",
              "version": "15.6(2)SP6"
            },
            {
              "status": "affected",
              "version": "15.6(2)SP7"
            },
            {
              "status": "affected",
              "version": "15.6(2)SP8"
            },
            {
              "status": "affected",
              "version": "15.6(2)SP9"
            },
            {
              "status": "affected",
              "version": "15.6(3)M4"
            },
            {
              "status": "affected",
              "version": "15.6(3)M5"
            },
            {
              "status": "affected",
              "version": "15.6(3)M6"
            },
            {
              "status": "affected",
              "version": "15.6(3)M7"
            },
            {
              "status": "affected",
              "version": "15.6(3)M6a"
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            {
              "status": "affected",
              "version": "15.6(3)M6b"
            },
            {
              "status": "affected",
              "version": "15.6(3)M8"
            },
            {
              "status": "affected",
              "version": "15.6(3)M9"
            },
            {
              "status": "affected",
              "version": "15.5(1)SY2"
            },
            {
              "status": "affected",
              "version": "15.5(1)SY3"
            },
            {
              "status": "affected",
              "version": "15.5(1)SY4"
            },
            {
              "status": "affected",
              "version": "15.5(1)SY5"
            },
            {
              "status": "affected",
              "version": "15.5(1)SY6"
            },
            {
              "status": "affected",
              "version": "15.5(1)SY7"
            },
            {
              "status": "affected",
              "version": "15.5(1)SY8"
            },
            {
              "status": "affected",
              "version": "15.5(1)SY9"
            },
            {
              "status": "affected",
              "version": "15.5(1)SY10"
            },
            {
              "status": "affected",
              "version": "15.5(1)SY11"
            },
            {
              "status": "affected",
              "version": "15.5(1)SY12"
            },
            {
              "status": "affected",
              "version": "15.5(1)SY13"
            },
            {
              "status": "affected",
              "version": "15.5(1)SY14"
            },
            {
              "status": "affected",
              "version": "15.5(1)SY15"
            },
            {
              "status": "affected",
              "version": "15.7(3)M3"
            },
            {
              "status": "affected",
              "version": "15.7(3)M2"
            },
            {
              "status": "affected",
              "version": "15.7(3)M4"
            },
            {
              "status": "affected",
              "version": "15.7(3)M5"
            },
            {
              "status": "affected",
              "version": "15.7(3)M4a"
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            {
              "status": "affected",
              "version": "15.7(3)M4b"
            },
            {
              "status": "affected",
              "version": "15.7(3)M6"
            },
            {
              "status": "affected",
              "version": "15.7(3)M7"
            },
            {
              "status": "affected",
              "version": "15.7(3)M8"
            },
            {
              "status": "affected",
              "version": "15.7(3)M9"
            },
            {
              "status": "affected",
              "version": "15.8(3)M"
            },
            {
              "status": "affected",
              "version": "15.8(3)M1"
            },
            {
              "status": "affected",
              "version": "15.8(3)M0a"
            },
            {
              "status": "affected",
              "version": "15.8(3)M0b"
            },
            {
              "status": "affected",
              "version": "15.8(3)M2"
            },
            {
              "status": "affected",
              "version": "15.8(3)M1a"
            },
            {
              "status": "affected",
              "version": "15.8(3)M3"
            },
            {
              "status": "affected",
              "version": "15.8(3)M2a"
            },
            {
              "status": "affected",
              "version": "15.8(3)M4"
            },
            {
              "status": "affected",
              "version": "15.8(3)M3a"
            },
            {
              "status": "affected",
              "version": "15.8(3)M3b"
            },
            {
              "status": "affected",
              "version": "15.8(3)M5"
            },
            {
              "status": "affected",
              "version": "15.8(3)M6"
            },
            {
              "status": "affected",
              "version": "15.8(3)M7"
            },
            {
              "status": "affected",
              "version": "15.8(3)M8"
            },
            {
              "status": "affected",
              "version": "15.8(3)M9"
            },
            {
              "status": "affected",
              "version": "15.9(3)M"
            },
            {
              "status": "affected",
              "version": "15.9(3)M1"
            },
            {
              "status": "affected",
              "version": "15.9(3)M0a"
            },
            {
              "status": "affected",
              "version": "15.9(3)M2"
            },
            {
              "status": "affected",
              "version": "15.9(3)M3"
            },
            {
              "status": "affected",
              "version": "15.9(3)M2a"
            },
            {
              "status": "affected",
              "version": "15.9(3)M3a"
            },
            {
              "status": "affected",
              "version": "15.9(3)M4"
            },
            {
              "status": "affected",
              "version": "15.9(3)M3b"
            },
            {
              "status": "affected",
              "version": "15.9(3)M5"
            },
            {
              "status": "affected",
              "version": "15.9(3)M4a"
            },
            {
              "status": "affected",
              "version": "15.9(3)M6"
            },
            {
              "status": "affected",
              "version": "15.9(3)M7"
            },
            {
              "status": "affected",
              "version": "15.9(3)M6a"
            },
            {
              "status": "affected",
              "version": "15.9(3)M6b"
            },
            {
              "status": "affected",
              "version": "15.9(3)M8"
            },
            {
              "status": "affected",
              "version": "15.9(3)M7a"
            },
            {
              "status": "affected",
              "version": "15.9(3)M9"
            },
            {
              "status": "affected",
              "version": "15.9(3)M8b"
            },
            {
              "status": "affected",
              "version": "15.9(3)M10"
            },
            {
              "status": "affected",
              "version": "15.9(3)M11"
            }
          ]
        },
        {
          "product": "Cisco IOS XE Software",
          "vendor": "Cisco",
          "versions": [
            {
              "status": "affected",
              "version": "3.16.8S"
            },
            {
              "status": "affected",
              "version": "3.16.9S"
            },
            {
              "status": "affected",
              "version": "3.16.10S"
            },
            {
              "status": "affected",
              "version": "3.8.6E"
            },
            {
              "status": "affected",
              "version": "3.8.7E"
            },
            {
              "status": "affected",
              "version": "3.8.8E"
            },
            {
              "status": "affected",
              "version": "3.8.9E"
            },
            {
              "status": "affected",
              "version": "3.8.10E"
            },
            {
              "status": "affected",
              "version": "3.18.5SP"
            },
            {
              "status": "affected",
              "version": "3.18.6SP"
            },
            {
              "status": "affected",
              "version": "3.18.7SP"
            },
            {
              "status": "affected",
              "version": "3.18.8aSP"
            },
            {
              "status": "affected",
              "version": "3.18.9SP"
            },
            {
              "status": "affected",
              "version": "16.6.5"
            },
            {
              "status": "affected",
              "version": "16.6.5a"
            },
            {
              "status": "affected",
              "version": "16.6.6"
            },
            {
              "status": "affected",
              "version": "16.6.7"
            },
            {
              "status": "affected",
              "version": "16.6.8"
            },
            {
              "status": "affected",
              "version": "16.6.9"
            },
            {
              "status": "affected",
              "version": "16.6.10"
            },
            {
              "status": "affected",
              "version": "16.8.1"
            },
            {
              "status": "affected",
              "version": "16.8.1a"
            },
            {
              "status": "affected",
              "version": "16.8.1b"
            },
            {
              "status": "affected",
              "version": "16.8.1s"
            },
            {
              "status": "affected",
              "version": "16.8.1c"
            },
            {
              "status": "affected",
              "version": "16.8.1d"
            },
            {
              "status": "affected",
              "version": "16.8.2"
            },
            {
              "status": "affected",
              "version": "16.8.1e"
            },
            {
              "status": "affected",
              "version": "16.8.3"
            },
            {
              "status": "affected",
              "version": "16.9.1"
            },
            {
              "status": "affected",
              "version": "16.9.2"
            },
            {
              "status": "affected",
              "version": "16.9.1a"
            },
            {
              "status": "affected",
              "version": "16.9.1b"
            },
            {
              "status": "affected",
              "version": "16.9.1s"
            },
            {
              "status": "affected",
              "version": "16.9.3"
            },
            {
              "status": "affected",
              "version": "16.9.4"
            },
            {
              "status": "affected",
              "version": "16.9.3a"
            },
            {
              "status": "affected",
              "version": "16.9.5"
            },
            {
              "status": "affected",
              "version": "16.9.5f"
            },
            {
              "status": "affected",
              "version": "16.9.6"
            },
            {
              "status": "affected",
              "version": "16.9.7"
            },
            {
              "status": "affected",
              "version": "16.9.8"
            },
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              "status": "affected",
              "version": "16.10.1"
            },
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              "status": "affected",
              "version": "16.10.1a"
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            {
              "status": "affected",
              "version": "16.10.1b"
            },
            {
              "status": "affected",
              "version": "16.10.1s"
            },
            {
              "status": "affected",
              "version": "16.10.1c"
            },
            {
              "status": "affected",
              "version": "16.10.1e"
            },
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              "status": "affected",
              "version": "16.10.1d"
            },
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              "status": "affected",
              "version": "16.10.2"
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              "status": "affected",
              "version": "16.10.1f"
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              "status": "affected",
              "version": "16.10.1g"
            },
            {
              "status": "affected",
              "version": "16.10.3"
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              "status": "affected",
              "version": "3.10.1E"
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              "status": "affected",
              "version": "3.10.2E"
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              "status": "affected",
              "version": "3.10.3E"
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              "status": "affected",
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              "status": "affected",
              "version": "16.11.1a"
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              "status": "affected",
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              "status": "affected",
              "version": "16.11.2"
            },
            {
              "status": "affected",
              "version": "16.11.1s"
            },
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              "status": "affected",
              "version": "16.12.1"
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              "status": "affected",
              "version": "16.12.1s"
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              "status": "affected",
              "version": "16.12.1a"
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              "status": "affected",
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              "status": "affected",
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              "status": "affected",
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              "status": "affected",
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              "status": "affected",
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            {
              "status": "affected",
              "version": "16.12.3"
            },
            {
              "status": "affected",
              "version": "16.12.8"
            },
            {
              "status": "affected",
              "version": "16.12.2s"
            },
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              "status": "affected",
              "version": "16.12.1x"
            },
            {
              "status": "affected",
              "version": "16.12.1t"
            },
            {
              "status": "affected",
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            },
            {
              "status": "affected",
              "version": "16.12.3s"
            },
            {
              "status": "affected",
              "version": "16.12.3a"
            },
            {
              "status": "affected",
              "version": "16.12.4a"
            },
            {
              "status": "affected",
              "version": "16.12.5"
            },
            {
              "status": "affected",
              "version": "16.12.6"
            },
            {
              "status": "affected",
              "version": "16.12.1z1"
            },
            {
              "status": "affected",
              "version": "16.12.5a"
            },
            {
              "status": "affected",
              "version": "16.12.5b"
            },
            {
              "status": "affected",
              "version": "16.12.1z2"
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            {
              "status": "affected",
              "version": "16.12.6a"
            },
            {
              "status": "affected",
              "version": "16.12.7"
            },
            {
              "status": "affected",
              "version": "16.12.9"
            },
            {
              "status": "affected",
              "version": "16.12.10"
            },
            {
              "status": "affected",
              "version": "16.12.10a"
            },
            {
              "status": "affected",
              "version": "16.12.11"
            },
            {
              "status": "affected",
              "version": "16.12.12"
            },
            {
              "status": "affected",
              "version": "16.12.13"
            },
            {
              "status": "affected",
              "version": "3.11.0E"
            },
            {
              "status": "affected",
              "version": "3.11.1E"
            },
            {
              "status": "affected",
              "version": "3.11.2E"
            },
            {
              "status": "affected",
              "version": "3.11.3E"
            },
            {
              "status": "affected",
              "version": "3.11.1aE"
            },
            {
              "status": "affected",
              "version": "3.11.4E"
            },
            {
              "status": "affected",
              "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"
            }
          ]
        }
      ],
      "source": "psirt@cisco.com"
    }
  ],
  "cveTags": [],
  "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."
    }
  ],
  "id": "CVE-2025-20160",
  "lastModified": "2026-06-17T08:40:49.253",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "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"
        },
        "exploitabilityScore": 2.2,
        "impactScore": 5.9,
        "source": "psirt@cisco.com",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2025-20160",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "total"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2025-09-25T03:56:03.259249Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2025-09-24T18:15:34.100",
  "references": [
    {
      "source": "psirt@cisco.com",
      "url": "https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ios-tacacs-hdB7thJw"
    }
  ],
  "sourceIdentifier": "psirt@cisco.com",
  "vulnStatus": "Deferred",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-287"
        }
      ],
      "source": "psirt@cisco.com",
      "type": "Secondary"
    }
  ]
}


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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

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Detection rules are retrieved from Rulezet.

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