What is CVE-2026-20301?

CVE-2026-20301 is a high-severity vulnerability in Cisco Ios Xe Software, classified under CWE-606. CVSS score: 8.6/10. Published 2026-08-05.

How severe is CVE-2026-20301?

High severity. CVSS v3 base score is 8.6 out of 10.

Vulnerability in Cisco Ios Xe Software

CVE-2026-20301

A vulnerability in the Extensible Messaging Client Protocol (XMCP), also referred to as the External Client protocol, of Cisco IOS Software and Cisco IOS XE Software could allow an unauthenticated, remote attacker to cause a denial of serv…

CVSS v3 metric

CVSS v3 base score 8.6 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H.

Affected products

Cisco Ios Xe Software — versions 17.2.1a, 16.12.1y, 16.12.3s
Cisco Ios — versions 15.2(7)E7, 15.2(8)E3, 15.7(3)M10

Weakness classification (CWE)

CWE-606

References

psirt@cisco.com

Frequently asked questions

What is CVE-2026-20301?: CVE-2026-20301 is a high-severity vulnerability in Cisco Ios Xe Software, classified under CWE-606. CVSS score: 8.6/10. Published 2026-08-05.
How severe is CVE-2026-20301?: High severity. CVSS v3 base score is 8.6 out of 10.