CVE-2022-20821Actively exploitedAdded to KEV 2022-05-23

Cisco IOS XR Open Port Vulnerability

Cisco, IOS XR

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.

CVSS severity for this advisory hasn't been enriched from NVD yet, check back shortly.

EPSS, exploit probability

High

11.5%

estimated chance of real-world exploitation in the next 30 days, higher than 96.0% of every CVE FIRST.org scores

Refreshed 10/28/2026, via FIRST.org's EPSS model, not CVSS, this measures likelihood of exploitation, not how severe it would be.

Required action

Apply updates per vendor instructions.

CISA-recommended due date: 2022-06-13

CWE-923

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