Is CVE-2022-20821 actively exploited?

Yes. CVE-2022-20821 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, which means exploitation in the wild has been confirmed.

Can CVE-2022-20821 be exploited remotely?

The attack vector of CVE-2022-20821 has not been classified yet.

What is the CVSS score of CVE-2022-20821?

CVE-2022-20821 has not received a CVSS score yet.

HOME VULNERABILITIESCVE-2022-20821

HIGHCISA KEVIN THE WILD

CVE-2022-20821

Published: May 23, 2022

EPSS:19.13%probability of exploitation in 30 daysPercentile:95.2th

Official Description

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.

NVD Source

CISA KEV Advisory

Cisco IOS XR Open Port Vulnerability

Added to KEV: 2022-05-23Federal patch deadline: 2022-06-13

Required Action (CISA)

Apply updates per vendor instructions.

Risk Analysis

Cisco IOS XR software's health check feature inadvertently opens TCP port 6379 by default upon activation, exposing a Redis instance within the NOSi container. This allows an attacker to connect to and access the Redis instance. The high EPSS score of 0.19129 and its inclusion in CISA's KEV catalog highlight the urgency and confirmed exploitation of this vulnerability.

This vulnerability is actively exploited in the wild and is listed in CISA's KEV catalog. It allows remote access to a Redis instance.

Recommended Action

Configure Cisco IOS XR software to close or restrict access to TCP port 6379, or disable the health check feature if not required. Implement strict network segmentation and firewall rules to protect internal services.

Generated by the CTIWATCH analysis pipeline from this CVE's metadata (CVSS, EPSS, KEV status, exploit intelligence). Verify against vendor advisories before acting.

Technical Analysis

CVE-2022-20821 requires local access, meaning attackers must already have a foothold on the target system.

Exploitation requires some privileges, which limits the exposure to scenarios where an attacker has already gained initial access.

CISA has added CVE-2022-20821 to the Known Exploited Vulnerabilities (KEV) catalog, confirming active exploitation in the wild. U.S. federal agencies are required to patch this within the mandated timeframe, and all organizations should treat remediation as urgent.