What is CVE-2026-20311?

CVE-2026-20311 is a medium-severity vulnerability in Cisco Ios Xe Software, classified under Buffer Over-read. CVSS score: 6.3/10. Published 2026-08-05.

How severe is CVE-2026-20311?

Medium severity. CVSS v3 base score is 6.3 out of 10.

Vulnerability in Cisco Ios Xe Software

CVE-2026-20311

A vulnerability in the web-based management interface of Cisco IOS XE Software could allow an authenticated, remote attacker with low privileges to cause a denial of service (DoS) condition on an affected device. This vulnerability is d…

CVSS v3 metric

CVSS v3 base score 6.3 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:N/I:N/A:H.

Affected products

Cisco Ios Xe Software — versions 17.3.1, 17.3.1a, 17.3.2a

Weakness classification (CWE)

CWE-126 — Buffer Over-read

References

psirt@cisco.com

Frequently asked questions

What is CVE-2026-20311?: CVE-2026-20311 is a medium-severity vulnerability in Cisco Ios Xe Software, classified under Buffer Over-read. CVSS score: 6.3/10. Published 2026-08-05.
How severe is CVE-2026-20311?: Medium severity. CVSS v3 base score is 6.3 out of 10.