CVE-2022-20821
CVSS v3
6.5
MEDIUM
EPSS Score
19.1 %
exploit probability
CISA KEV
Yes
known exploited
Exploitation
—
SSVC status
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.
CISA Known Exploited Vulnerability
- Date Added
- 2022-05-23
- Patch Due Date
- 2022-06-13
- Ransomware Use
- Unknown
Technical details
- Published
- 2022-05-26
Frequently asked questions
What is CVE-2022-20821?
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.
Is CVE-2022-20821 actively exploited?
Yes. CVE-2022-20821 is on the CISA Known Exploited Vulnerabilities (KEV) catalog, meaning it has been confirmed as actively exploited in the wild. CISA requires federal agencies to patch by 2022-06-13.
What is the CVSS score for CVE-2022-20821?
CVE-2022-20821 has a CVSS v3 base score of 6.5 (MEDIUM severity).
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