CVE-2022-20821Cisco IOS XR Software Health Check Open Port Vulnerability
Updated under an hour ago ()
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It affects Cisco IOS XR Software and 1 other product. Add what you run to find out whether that includes you.
CISA lists it as known exploited since May 23, 2022; federal agencies had to remediate by Jun 13, 2022. Treat that date as your deadline.
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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
- 6.5 MEDIUM (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
- Weakness (CWE)
- CWE-200
- Known exploited
- Added to CISA KEV May 23, 2022; federal remediation due Jun 13, 2022Apply updates per vendor instructions.
- EPSS (exploitation in the next 30 days)
- 11.47% (percentile 96)
- Assigned by
- cisco
- NVD analysis
- Analyzed
- Record last updated
- Oct 21, 2025
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Cisco Cisco IOS XR Software cisco:ios_xr_software (from the name) | all versions | CNA record |
cisco ios_xr cisco:ios_xr | all versions | NVD |
References
- https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-iosxr-redis-ABJyE5xKvendor-advisory, x-refsource-cisco
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2022-20821us-government-resource
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.