CVE-2026-20267CWE-284broken-access-control

CVE-2026-20267

Critical · published August 5, 2026

CVSS v3.1
9.0
EPSS
0%
Percentile
31.3
In the wild
Unconfirmed
What it is

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 software hardening releases that address multiple internally discovered vulnerabilities.

The vulnerabilities tracked by CVE-2026-20267 are related to improper access control issues that are grouped under the Common Weakness Enumeration (CWE) Pillar CWE-284. 

The record
Technical detail
CVSS v3.1
9.0 · CRITICAL
Vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H
CVSS v4.0
Not supplied
EPSS
0.00384 · 31.3th percentile
Weakness
CWE-284 · Improper Access Control
Published
2026-08-05T21:16Z
Affected products (267)
ProductVersionsFixed in
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References (2)
https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-hardening-iosxe-V8NMuMZJ · [email protected]https://www.cve.org/Media/News/item/blog/2026/06/16/Preserving-Vulnerability-Level-Identification · af854a3a-2127-422b-91ae-364da2661108
EPSS history
Timeline
  • 05 AUG 16:18Z
    Cisco IOS XE Software Security Hardening Release
    cvelistv5