CVE-2026-20263 Cisco IOS XE Software Blocks Extensible Exchange Protocol Denial of Service Vulnerability

High 8.6 Published 5 Aug 2026 Updated 5 Aug 2026

An unauthenticated remote attacker can cause a denial of service on Cisco IOS XE devices by sending a malicious BEEP SOAP request.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Over the internet
Victim action needed: Not needed
Fix: None listed

What is CVE-2026-20263?

CVE-2026-20263 is a high-severity denial of service vulnerability in Cisco Ios Xe, published on 5 Aug 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

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.

Weakness: CWE-388

Which versions are affected by CVE-2026-20263?

It affects 1 product.

Products include Cisco Ios Xe.

How do I fix CVE-2026-20263?

No fix has been published for CVE-2026-20263 yet. Limit exposure of the affected software until one is available.

Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.

Is CVE-2026-20263 being exploited?

There is no known exploitation of CVE-2026-20263 in the wild and no public exploit code.

All Cisco Ios Xe vulnerabilities

Sources

Also known as GHSA-wrfp-gcwf-q2vv.