CVE-2026-20277CWE-693

CVE-2026-20277

High · published September 2, 2026

CVSS v3.1
8.2
EPSS
0%
Percentile
13.4
In the wild
Unconfirmed
What it is

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-2026-20277 are related to protection mechanism failure issues that are grouped under the Common Weakness Enumeration (CWE) CWE-693.

The record
Technical detail
CVSS v3.1
8.2 · HIGH
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H
CVSS v4.0
Not supplied
EPSS
0.00233 · 13.4th percentile
Weakness
CWE-693 · Protection Mechanism Failure
Published
2026-09-02T21:17Z
References (2)
https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-hardening-iosxr-qg64NcM · [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
  • 04 SEP 03:39Z
    EPSS moved — → 0%
    epss
  • 02 SEP 16:13Z
    Cisco IOS XR Software Security Hardening Release: September 2026
    cvelistv5