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.

AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H

CWE-606

https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ios-xmcp-thbAr34t

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