ACTIVELY EXPLOITED
CVE-2022-20821: Cisco IOS XR Open Port Vulnerability
| Vendor | Cisco |
|---|---|
| Product | IOS XR |
| Actively exploited | Yes |
| Added to CISA KEV | 23 May 2022 |
| CISA federal deadline | 13 Jun 2022 |
| Weakness (CWE) | CWE-923 |
Required action (CISA's text)
Apply updates per vendor instructions.
Description (NVD)
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.
SOURCES
Other Cisco flaws
- CVE-2026-20320: Cisco BroadWorks Improper Restriction of XML External Entity Reference Vulnerability
- CVE-2026-76418: Cisco Secure Firewall ASA Software and Cisco Secure FTD Software Unchecked Return Value to NULL Pointer Dereference Vulnerability
- CVE-2026-76519: Cisco Secure Email Gateway Relative Path Traversal Vulnerability
- CVE-2026-76504: Cisco Catalyst SD-WAN Manager Hex Encoding Vulnerability
- CVE-2026-76460: Cisco Identity Services Engine Incorrect Use of Privileged APIs Vulnerability
Data from NVD, CISA KEV, FIRST EPSS and vendor advisories. Updated 10 Nov 2026.