Protection mechanism failure in Cisco IOS XR - CVE-2026-20277
Published: September 2, 2026
Vulnerability identifier: #VU146767
CSH Severity: High
CVSS v4: 8.8 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-20277
CWE-ID: CWE-693
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to bypass protection mechanisms.
The vulnerability exists due to protection mechanism failure in Cisco IOS XR Software when processing security-sensitive operations. A remote attacker can leverage insufficiently random values to bypass protection mechanisms.
The covered issues include use of insufficiently random values.
Affected software
Cisco IOS XR
How to mitigate CVE-2026-20277
Install security update from vendor's website.
Cisco IOS XR - addressed in versions 26.2.2, 26.3.1