Home › Exploited CVEs › CVE-2022-20821
CVE-2022-20821: Cisco IOS XR Open Port Vulnerability
Cisco IOS XR · in CISA KEV since 2022-05-23
2022-05-23added to KEV
2022-06-13federal remediation due date
12.09%EPSS exploit probability (30 days) 96.0th percentile
6.5 MEDIUMCVSS 3.1
Unknownknown ransomware use
-3days from NVD publication to KEV
What it is
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 (CISA)
Apply updates per vendor instructions.
| CWE | CWE-923 |
|---|---|
| CVSS vector | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N |
| NVD published | 2022-05-26 (Analyzed) |
Original records: NVD · CISA KEV · JSON: /api/cve/CVE-2022-20821.json · all KEV CVEs
Kevscope: daily CISA KEV + EPSS datasetThe whole KEV catalog joined with daily EPSS and CVSS scores as CSV/Parquet, refreshed daily. Free to download.
Get the full file: Exploited Vulnerabilities Brief – September 2026 ($29): this month's KEV additions ranked by EPSS, ransomware use and due date, ready to hand to a patch team. Checkout by Polar.
Get the full file: Exploited Vulnerabilities Brief – September 2026 ($29): this month's KEV additions ranked by EPSS, ransomware use and due date, ready to hand to a patch team. Checkout by Polar.