SB2026080630 - Denial of service in Cisco IOS XE BEEP feature

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Main Vulnerability Database SB2026080630

SB2026080630 - Denial of service in Cisco IOS XE BEEP feature

Published: August 6, 2026

Security Bulletin ID SB2026080630
CSH Severity
High
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Remote access
Highest impact Denial of service

Breakdown by Severity

High 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 1 vulnerability.


1) Improper error handling (CVE-ID: CVE-2026-20263)

CWE-ID: CWE-388 - Error Handling

CVSSv4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]


The vulnerability allows a remote attacker to cause a denial of service.

The vulnerability exists due to improper handling in the Blocks Extensible Exchange Protocol (BEEP) feature when parsing a specific BEEP SOAP request. A remote attacker can send a specific BEEP SOAP request to cause a denial of service.

A successful exploit could cause the affected device to reload unexpectedly. Only devices with the BEEP feature configured are vulnerable.


Remediation

Install update from vendor's website.

References