CVE-2022-20821

criticalknown exploitedcovered by 1 sourcefirst seen 2022-05-23

Actively exploited. CVE-2022-20821 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2022-05-23) — exploitation has been observed in the wild, and US federal agencies are required to remediate it under BOD 22-01. Treat patching as urgent.

Cisco IOS XR software health check opens TCP port 6379 by default on activation. An attacker can connect to the Redis instance on the open port and allow access to the Redis instance that is running within the NOSi container.

CSIRTS triage

What: Cisco IOS XR software health check opens TCP port 6379 by default on activation, allowing access to the Redis instance.
Who is affected: Deployments of Cisco IOS XR software.
Urgency: Remediation is urgent due to active exploitation and critical severity.
Action: Close TCP port 6379 or apply the latest security updates.

AI-assisted analysis generated from the source advisory — verify against the original.

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Exploitation outlook

Exploitation confirmedAlready exploited in the wild (CISA KEV) — the prediction phase is over. Patch now. Riskier than 96% of all EPSS-scored CVEs.

Advisory coverage (1)

criticalexploitedCVE-2022-20821: Cisco IOS XR Open Port Vulnerabilitycisa-kev · 2022-05-23

External references

NVD record for CVE-2022-20821

CVE.org record

CISA KEV catalog

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