CVE-2026-20263

What it is

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.

At a glance

Exploitability

Can be exploited over the network without logging in. High risk of service disruption.

Exploit odds

0.6% chance of exploitation in the next 30 days (EPSS).

Fix

A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

1. 2026-08-05 17:16 UTC PublishedDisclosed publicly on CVE.org and NVD
2. 2026-10-23 21:10 UTC Last updatedMost recent change to the record

Details

Published

2026-08-05 17:16 UTC

Last modified

2026-10-23 21:10 UTC

Exploit probability

0.6% · EPSS, next 30 days

Weakness

CWE-388

Record status

Analyzed

Affected

• Cisco iOS Xe 16.6.2
• Cisco iOS Xe 16.6.3
• Cisco iOS Xe 16.6.4
• Cisco iOS Xe 16.6.4a
• Cisco iOS Xe 16.6.4s
• Cisco iOS Xe 16.6.5
• Cisco iOS Xe 16.6.5a
• Cisco iOS Xe 16.6.5b

Attack profile CVSS 3.1 · 8.6

Attack vector

Network

Complexity

Low

Privileges needed

None

User interaction

None

Scope

Changed

Confidentiality

None

Integrity

None

Availability

High