CVE-2026-20301: Cisco IOS XE Software, невалидиран вход

Описание

Оригинално описание

A vulnerability in the Extensible Messaging Client Protocol (XMCP), also referred to as the External Client protocol, of Cisco IOS Software and Cisco IOS XE Software could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device. This vulnerability is due to improper handling of malformed XMCP packets. An attacker could exploit this vulnerability by sending a malformed XMCP packet to an affected device. A successful exploit could allow the attacker to cause the affected device to reload unexpectedly, resulting in a DoS condition. The attacker does not need the XMCP client username to exploit this vulnerability.

Засегнати продукти

• Cisco Cisco IOS XE Software: 17.2.1a; 16.12.1y; 16.12.3s; 16.7.1b; 16.6.2; 16.6.5; 16.12.1w; 16.9.1d; 17.3.1; 16.9.4c; 16.7.1; 17.2.1; 16.6.8; 16.9.1b; 16.9.2s; 16.12.4; 16.12.3a; 17.1.1s; 16.11.1a; 16.7.2; 16.11.1b; 16.9.1s; 16.9.3h; 16.9.1c; 16.6.5a; 16.6.3; 16.10.1f; 17.2.1v; 16.8.1e; 16.9.3a; 16.12.1a; 16.12.1x; 3.16.10aS; 16.6.4s; 16.10.1c; 16.12.3; 16.11.2; 16.6.5b; 16.12.2s; 16.10.1b; 16.7.3; 16.6.7; 16.9.6; 16.9.2; 16.10.1; 16.12.1t; 16.9.1; 16.8.1a; 3.18.8aSP; 16.9.3s; 16.6.7a; 16.12.2; 16.11.1; 16.9.3; 16.11.1s; 16.12.1; 17.1.1; 17.1.2; 16.10.1d; 17.1.1t; 16.9.4; 16.8.3; 16.12.2t; 16.9.5; 16.8.1s; 16.10.1e; 16.8.2; 16.6.4; 16.8.1b; 16.10.1a; 16.12.1z; 16.8.1c; 16.9.1a; 16.9.5f; 16.6.4a; 16.10.1g; 16.8.1; 16.6.6; 16.9.2a; 16.8.1d; 16.10.3; 16.7.1a; 16.11.1c; 16.10.1s; 17.2.1r; 17.1.1a; 16.10.2; 16.12.2a; 16.12.1c; 16.12.1s; 16.7.4; 3.18.9SP; 17.2.2; 3.11.3E; 16.9.8; 16.9.7; 17.1.3; 17.3.1a; 3.11.4E; 17.3.2a; 16.12.5; 17.3.1w; 17.3.2; 3.11.3aE; 17.4.1; 16.12.4a; 17.4.1a; 3.16.10bS; 17.3.1x; 17.3.3; 16.6.9; 17.2.3; 17.5.1; 16.12.1z1; 16.12.5a; 17.4.1b; 17.3.1z; 16.12.5b; 17.4.2; 17.3.3a; 3.11.5E; 17.3.5; 17.3.4; 17.5.1a; 16.12.6; 17.6.1; 16.12.1z2; 16.6.10; 17.3.4a; 17.6.1a; 3.8.10cE; 17.7.1; 17.6.1x; 17.6.2; 16.12.6a; 17.3.4c; 17.4.2a; 17.3.4b; 17.7.1a; 16.12.7; 17.8.1a; 17.6.3a; 17.6.3; 17.7.2; 17.7.1b; 17.9.1w; 17.3.5a; 17.6.1z; 3.8.10dE; 16.12.8; 17.8.1; 17.9.1; 3.11.6E; 17.6.4; 3.11.7E; 17.3.5b; 17.9.1a; 17.3.6; 17.10.1; 3.11.8E; 16.9.8a; 17.6.1z1; 17.10.1a; 17.9.2; 17.6.5; 17.9.1x; 17.9.1y; 16.9.8b; 17.3.7; 17.9.2a; 17.9.3; 16.12.9; 17.11.1; 17.10.1b; 17.6.6; 17.9.1x1; 17.11.1a; 17.9.3a; 17.12.1; 17.3.8; 17.9.4; 16.12.10; 17.12.1w; 17.9.1y1; 17.12.1a; 3.11.9E; 17.9.5; 17.13.1; 17.12.1x; 17.12.2; 17.14.1; 17.9.4a; 17.3.8a; 17.6.6a; 17.6.5a; 17.6.7; 16.12.10a; 17.15.1; 17.13.1a; 17.12.2a; 16.12.11; 17.12.3; 17.12.1y; 3.11.10E; 17.12.1z; 17.9.5a; 17.14.1a; 17.9.5b; 17.6.8; 16.12.12; 17.12.4; 17.9.6; 17.17.1; 17.16.1; 17.15.1w; 17.12.3a; 3.11.11E; 17.9.5c; 17.15.1a; 17.12.1z1; 17.15.2; 17.15.1b; 17.9.5d; 17.15.1x; 17.9.6a; 17.12.1z2; 17.6.8a; 17.16.1a; 16.12.13; 17.15.3; 17.9.7; 17.12.5; 17.15.1y; 17.9.5e; 17.12.4a; 17.15.2a; 17.15.2c; 17.15.2b; 17.12.1z3; 17.9.5f; 17.12.4b; 3.11.12E; 17.12.5a; 17.18.1; 17.12.6; 17.12.1z4; 17.9.8; 17.9.7a; 17.15.3a; 17.15.4; 3.11.13E; 17.12.5b; 17.15.3b; 16.12.14; 17.18.1z; 17.9.7b; 17.12.5c; 26.1.1; 17.18.1a; 17.15.4a; 17.18.2; 17.18.1w; 17.15.4b; 17.12.6a; 17.12.7; 17.15.4c; 17.9.9; 17.12.5d; 16.12.15; 17.15.4s1; 17.15.5; 17.12.1z5; 17.18.1x; 17.12.1z6; 17.15.4d; 17.12.6b; 17.4.1c; 3.11.14E; 17.15.5a; 17.18.1y; 17.12.7a; 17.18.3; 17.12.7b; 17.18.3a; 26.1.1a; 26.2.1ea; 16.12.16
• Cisco IOS: 15.2(7)E7; 15.2(8)E3; 15.7(3)M10; 15.8(3)M9; 15.9(3)M7; 15.2(7)E8; 15.2(8)E4; 15.9(3)M7a; 15.2(2)E10c; 15.2(4)E10d; 15.9(3)M6a; 15.9(3)M6b; 15.5(1)SY10; 15.5(1)SY11; 15.2(6)E1a; 15.4(1)SY4; 15.5(1)SY1; 15.2(2)E8; 15.2(6)E1; 15.7(3)M2; 15.2(4)E6; 15.2(1)SY6; 15.2(4)EA7; 15.2(6)E1s; 15.7(3)M3; 15.8(3)M; 15.2(1)SY7; 15.2(4)EA8; 15.8(3)M0a; 15.2(2)E9; 15.2(6)E2; 15.5(1)SY2; 15.2(4)E7; 15.2(6)E2a; 15.2(2)E9a; 15.8(3)M0b; 15.2(6)E2b; 15.8(3)M1; 15.8(3)M1a; 15.7(3)M4; 15.2(1)SY8; 15.2(4)E8; 15.5(1)SY3; 15.2(7)E; 15.7(3)M4a; 15.8(3)M2; 15.2(7)E0a; 15.8(3)M2a; 15.7(3)M4b; 15.2(2)E10; 15.2(7)E0s; 15.2(4)EA9; 15.2(7)E0b; 15.2(6)E3; 15.9(3)M; 15.8(3)M3; 15.5(1)SY4; 15.7(3)M5; 15.2(2)E10a; 15.2(4)E9; 15.2(7)E1; 15.8(3)M3b; 15.9(3)M0a; 15.2(7)E1a; 15.2(4)E10; 15.5(1)SY5; 15.2(4)EA9a; 15.9(3)M1; 15.8(3)M4; 15.7(3)M6; 15.2(7)E2; 15.5(1)SY6; 15.2(7)E3; 15.8(3)M5; 15.7(3)M7; 15.9(3)M2; 15.2(7)E2b; 15.9(3)M2a; 15.2(4)E10a; 15.2(7)E4; 15.5(1)SY7; 15.2(4)E10b; 15.2(7)E3k; 15.2(8)E; 15.9(3)M3; 15.8(3)M6; 15.7(3)M8; 15.8(3)M7; 15.5(1)SY8; 15.2(7)E5; 15.2(8)E1; 15.9(3)M4; 15.2(8)E2; 15.2(4)E10c; 15.7(3)M9; 15.2(2)E10b; 15.2(7)E6; 15.9(3)M4a; 15.5(1)SY9; 15.9(3)M5; 15.8(3)M8; 15.9(3)M6; 15.9(3)M9; 15.5(1)SY13; 15.9(3)M8b; 15.2(7)E9; 15.5(1)SY12; 15.7(3)M10a; 15.9(3)M8; 15.9(3)M8a; 15.2(8)E5; 15.2(7)E10; 15.7(3)M10b; 15.9(3)M3a; 15.8(3)M3a; 15.9(3)M3b; 15.6(2)SP7; 15.6(2)SP5; 15.6(2)SP8; 15.6(2)SP6; 15.6(2)SP4; 15.6(2)SP9; 15.6(2)SP8a; 15.9(3)M9a; 15.2(8)E6; 15.9(3)M10; 15.2(7)E11; 15.5(1)SY14; 15.2(8)E7; 15.2(4)E10e; 15.9(3)M11; 15.2(7)E12; 15.5(1)SY15; 15.2(8)E8; 15.5(1)SY16; 15.2(7)E13; 15.9(3)M12; 15.5(1)SY17; 15.2(7)E14; 15.9(3)M13

Вид слабост

• CWE-606 Unchecked Input for Loop Condition

История

Други уязвимости в Cisco Cisco IOS XE Software

• 6.3CVE-2026-20311
• 4.3CVE-2026-20308
• 8.6CVE-2026-20273
• 9.8CVE-2026-20272
• 8.6CVE-2026-20271

Първоизточници

• https://www.cve.org/CVERecord?id=CVE-2026-20301
• https://nvd.nist.gov/vuln/detail/CVE-2026-20301
• https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ios-xmcp-thbAr34t