CVE-2026-20263

HighCVSS 8.6/10Last modified Oct 23, 2026

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.

Metrics

CVSS 3.1 8.6/10CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H

Weakness enumeration

CWE-388

Affected software

VendorProductVersions
CiscoCisco IOS XE Software17.2.1a; 16.12.1y; 16.12.3s; 16.7.1b; 16.6.2; 16.6.5; 16.12.1w; 16.9.1d; 17.3.1; 16.9.4c; 16.7.1; 17.2.1; 16.6.8; 16.9.1b; 16.9.2s; 16.12.4; 16.12.3a; 17.1.1s; 16.11.1a; 16.7.2

References

Timeline

Published
Aug 5, 2026
Last modified
Oct 23, 2026
NVD status
Analyzed

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CVE-2026-20263: High severity, CVSS 8.6 | Vulnix