Zero-day vulnerability in Cisco IOS XR

Improper access control

Vulnerability details

Advisory: SB2022052101 - Improper access restrictions in Cisco IOS XR

Vulnerable component: Cisco IOS XR

CVE-ID: CVE-2022-20821

CVSSv3 score: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N/E:H/RL:O/RC:C

CWE-ID: CWE-284 - Improper Access Control


The vulnerability allows a remote attacker to gain unauthorized access to sensitive information.

The vulnerability exists due to unrestricted access to the Redis instance running within the NOSi container, accessible via port 6379/tcp (the health check RPM opens this port by default). A remote non-authenticated attacker can connect to the Redis instance and obtain sensitive information or modify it.

Note, the vulnerability is being actively exploited in the wild.