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CRITICAL

CVE-2026-20279

CVSS v3

9.8

CRITICAL

EPSS Score

0.3 %

exploit probability, as of 2026-09-28

CISA KEV

No

known exploited

Exploitation

—

SSVC status

Description

As part of Cisco's ongoing commitment to proactive security and product quality, the Cisco IOS XR Software engineering team has conducted a comprehensive internal security review. This review resulted in a software hardening releases that address multiple internally discovered vulnerabilities. The vulnerabilities tracked by CVE-2026-20279 are related to improper access control issues that are grouped under the Common Weakness Enumeration (CWE) CWE-284.

Technical details

Published
2026-09-02
Last Modified
2026-09-03

Frequently asked questions

What is CVE-2026-20279?

As part of Cisco's ongoing commitment to proactive security and product quality, the Cisco IOS XR Software engineering team has conducted a comprehensive internal security review. This review resulted in a software hardening releases that address multiple internally discovered vulnerabilities. The vulnerabilities tracked by CVE-2026-20279 are related to improper access control issues that are grouped under the Common Weakness Enumeration (CWE) CWE-284.

Is CVE-2026-20279 actively exploited?

Active exploitation of CVE-2026-20279 has not been confirmed. Its EPSS score was 0.3% on 2026-09-28, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2026-20279?

CVE-2026-20279 has a CVSS v3 base score of 9.8 (CRITICAL severity).

Is CVE-2026-20279 affecting your environment?

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