Vulnerability Description
A vulnerability in the health check RPM of Cisco IOS XR Software could allow an unauthenticated, remote attacker to access the Redis instance that is running within the NOSi container. This vulnerability exists because the health check RPM opens TCP port 6379 by default upon activation. An attacker could exploit this vulnerability by connecting to the Redis instance on the open port. A successful exploit could allow the attacker to write to the Redis in-memory database, write arbitrary files to the container filesystem, and retrieve information about the Redis database. Given the configuration of the sandboxed container that the Redis instance runs in, a remote attacker would be unable to execute remote code or abuse the integrity of the Cisco IOS XR Software host system.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Cisco | Ios Xr | - |
| Cisco | 8201 | - |
| Cisco | 8202 | - |
| Cisco | 8208 | - |
| Cisco | 8212 | - |
| Cisco | 8218 | - |
| Cisco | Ncs-55A1-24H | - |
| Cisco | Ncs-55A1-24Q6H-S | - |
| Cisco | Ncs-55A1-36H-S | - |
| Cisco | Ncs-55A1-36H-Se | - |
| Cisco | Ncs-55A1-36H-Se-S | - |
| Cisco | Ncs-55A2-Mod-Hd-S | - |
| Cisco | Ncs-55A2-Mod-Hx-S | - |
| Cisco | Ncs-55A2-Mod-S | - |
| Cisco | Ncs-55A2-Mod-Se-H-S | - |
| Cisco | Ncs-55A2-Mod-Se-S | - |
| Cisco | Ncs 1001 | - |
| Cisco | Ncs 1002 | - |
| Cisco | Ncs 1004 | - |
| Cisco | Ncs 5001 | - |
Related Weaknesses (CWE)
References
- https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-iVendor Advisory
- https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-iVendor Advisory
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2022-US Government Resource
FAQ
What is CVE-2022-20821?
CVE-2022-20821 is a vulnerability with a CVSS score of 6.5 (MEDIUM). A vulnerability in the health check RPM of Cisco IOS XR Software could allow an unauthenticated, remote attacker to access the Redis instance that is running within the NOSi container. This vulnerabil...
How severe is CVE-2022-20821?
CVE-2022-20821 has been rated MEDIUM with a CVSS base score of 6.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2022-20821?
Check the references section above for vendor advisories and patch information. Affected products include: Cisco Ios Xr, Cisco 8201, Cisco 8202, Cisco 8208, Cisco 8212.