May 23, 2022 · Applied Cybernetics Group
CVE-2022-20821 — Cisco IOS XR
Cisco IOS XR Open Port Vulnerability
- Added to KEV
2022-05-23- Federal due date
2022-06-13- Vendor
- Cisco
- Product
- IOS XR
- EPSS
- 95.6th percentile (score 0.118, as of
2026-07-13) - NVD CVSS v3.1
- —
- Ransomware use
- Unknown
- ATT&CK
- T1190 · signal rollup
- Upstream
- https://nvd.nist.gov/vuln/detail/CVE-2022-20821
CISA short 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.
Required action
Apply updates per vendor instructions.