Cisco IOS Software Extensible Messaging Client Protocol DoS (cisco-sa-ios-xmcp-thbAr34t)

According to its self-reported version, Cisco IOS is affected by a denial of service vulnerability. A flaw exists in the Extensible Messaging Client Protocol XMCP due to improper handling of malformed XMCP packets. An unauthenticated, remote attacker can exploit this issue, via a malformed XMCP...

CVE-2026-20301 Cisco IOS Software and IOS XE Software Extensible Messaging Client Protocol Denial of Service Vulnerability

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 ...

EUVD-2026-53467

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 ...

CVE-2026-20301

CVE-2026-20301 affects Cisco IOS Software and Cisco IOS XE Software via the Extensible Messaging Client Protocol (XMCP / External Client protocol). The flaw is improper handling of malformed XMCP packets, enabling an unauthenticated, remote attacker to trigger a device reload and cause a DoS. The...

CVE-2026-20301: Unchecked Input for Loop Condition

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 ...