A vulnerability (CVE-2026-20263) in the BEEP feature of Cisco IOS XE Software allows an unauthenticated, remote attacker to cause a denial of service by sending a crafted BEEP SOAP request, triggering an unexpected device reload. Cisco has released software updates to address this High-impact vulnerability, and no workarounds are available.
A vulnerability in the Blocks Extensible Exchange Protocol (BEEP) feature of 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 when parsing a specific BEEP SOAP request. An attacker could exploit this vulnerability by sending a specific BEEP SOAP request to an affected device. A successful exploit could allow the attacker to cause the device to reload unexpectedly, resulting in a DoS condition. Cisco has released software updates that address this vulnerability. There are no workarounds that address these vulnerabilities. This advisory is available at the following link: https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-iosxe-bing-MGHrFAkd <br/>Security Impact Rating: High <br/>CVE: CVE-2026-20263