Actively exploited · Published May 26, 2022 · Assigned by cisco
CVE-2022-20821Cisco IOS XR Software Health Check Open Port Vulnerability
Medium 6.5 Exploited
In plain English
A medium-severity information exposure in Cisco IOS XR Software from Cisco. Attackers are actively exploiting it in the wild (listed by CISA on May 23, 2022). The chance it is exploited in the next 30 days is estimated at 11.5% (higher than 96% of all known vulnerabilities). Apply updates per vendor instructions.
CISA guidance
Apply updates per vendor instructions.
Federal agencies must remediate by Jun 13, 2022.
Official 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.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Cisco | Cisco IOS XR Software | n/a |
Weakness: CWE-200 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
References
- 20220520 Cisco IOS XR Software Health Check Open Port Vulnerability vendor-advisory, x_refsource_CISCO
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2022-20821 government-resource