Overview
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.
https://nvd.nist.gov/vuln/detail/CVE-2022-20821
Key Details
| Property | Value |
|---|---|
| CVE ID | CVE-2022-20821 |
| Vendor / Product | Cisco — IOS XR |
| NVD Published | 2022-05-26 |
| NVD Last Modified | 2025-10-28 |
| CVSS 3.1 Score | 6.5 |
| CVSS 3.1 Vector | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N |
| Severity | MEDIUM |
| CWE | CWE-200 |
| CISA KEV Added | 2022-05-23 |
| CISA KEV Deadline | 2022-06-13 |
| Known Ransomware Use | No |
CVSS 3.1 Breakdown
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
Low
Availability
None
Required Action
CISA BOD 22-01 Deadline: 2022-06-13.
Apply updates per vendor instructions.
Timeline
| Date | Event |
|---|---|
| 2022-05-23 | Added to CISA Known Exploited Vulnerabilities catalog |
| 2022-06-13 | CISA BOD 22-01 remediation deadline |
References
| Resource | Type |
|---|---|
| NVD — CVE-2022-20821 | Vulnerability Database |
| CISA KEV Catalog Entry | US Government |