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CVE-2022-20821: Cisco IOS XR Open Port Vulnerability

criticalknown exploitedCVE-2022-20821
Actively exploited. At least one CVE in this advisory is listed in the CISA Known Exploited Vulnerabilities catalog — exploitation has been observed in the wild. Treat remediation 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

vendor: Ciscoproduct: IOS XROther
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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Details

Source
CISA Known Exploited Vulnerabilities (US · database · site)
Severity
critical
Published
2022-05-23
Exploitation
Observed in the wild (CISA KEV)

Original advisory: https://nvd.nist.gov/vuln/detail/CVE-2022-20821

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Referenced CVEs

CVECSIRTS overviewExternal
CVE-2022-20821coverage & exploitation statusNVD · CVE.org

Recent advisories for Cisco IOS XR

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

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