What is CVE-2026-20273?

CVE-2026-20273 is a high-severity vulnerability in Cisco Ios Xe Software, classified under Improper Input Validation. CVSS score: 8.6/10. Published 2026-08-05.

How severe is CVE-2026-20273?

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

Improper input validation in Cisco Ios Xe Software

CVE-2026-20273

As part of Cisco's ongoing commitment to proactive security and product quality, the Cisco IOS XE Software engineering team has conducted a comprehensive internal security review. This review resulted in a software hardening release that a…

Vulnerability class: Drupalgeddon 2 (CVE-2018-7600)

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

Weakness classification (CWE)

CWE-20 — Improper Input Validation

References

psirt@cisco.com

Frequently asked questions

What is CVE-2026-20273?: CVE-2026-20273 is a high-severity vulnerability in Cisco Ios Xe Software, classified under Improper Input Validation. CVSS score: 8.6/10. Published 2026-08-05.
How severe is CVE-2026-20273?: High severity. CVSS v3 base score is 8.6 out of 10.