Improper access restrictions in Cisco IOS XR

Published: 2022-05-21 | Updated: 2022-05-23
Risk Medium
Patch available YES
Number of vulnerabilities 1
CVE-ID CVE-2022-20821
Exploitation vector Network
Public exploit This vulnerability is being exploited in the wild.
Vulnerable software
Cisco IOS XR
Operating systems & Components / Operating system

Vendor Cisco Systems, Inc

Security Bulletin

This security bulletin contains one medium risk vulnerability.

1) Improper access control

EUVDB-ID: #VU63500

Risk: Medium

CVSSv3.1: 6.2 [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]

CVE-ID: CVE-2022-20821

CWE-ID: CWE-284 - Improper Access Control

Exploit availability: No


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.


Install updates from vendor's website.

Vulnerable software versions

Cisco IOS XR: 7.3.3

CPE2.3 External links

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

Yes. This vulnerability is being exploited in the wild.