CVEvulnerability

CVE-2022-20821

6.5 MEDIUM Known exploited Published 2022-05-26 Modified 2026-06-17 Official page ↗

CISA Known Exploited Vulnerability

Cisco IOS XR Open Port Vulnerability — Cisco IOS XR

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.

Added to KEV: 2022-05-23
Remediation due: 2022-06-13
Ransomware use: Unknown
Required action: Apply updates per vendor instructions.
Notes: https://nvd.nist.gov/vuln/detail/CVE-2022-20821

Status: Analyzed
Published: 2022-05-26
Last modified: 2026-06-17
Assigner: [email protected]
CVSS 3.1 ([email protected]): 6.5 MEDIUM — CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
CVSS 3.1 ([email protected]): 6.5 MEDIUM — CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
CVSS 2.0 ([email protected]): 6.4 MEDIUM — AV:N/AC:L/Au:N/C:P/I:P/A:N
Weaknesses: CWE-200

Description

A vulnerability in the health check RPM of Cisco IOS XR Software could allow an unauthenticated, remote attacker to access the Redis instance that is running within the NOSi container. This vulnerability exists because the health check RPM opens TCP port 6379 by default upon activation. An attacker could exploit this vulnerability by connecting to the Redis instance on the open port. A successful exploit could allow the attacker to write to the Redis in-memory database, write arbitrary files to the container filesystem, and retrieve information about the Redis database. Given the configuration of the sandboxed container that the Redis instance runs in, a remote attacker would be unable to execute remote code or abuse the integrity of the Cisco IOS XR Software host system.

Affected configurations

• cisco ios xr

Weakness · CWE (1)

CWE-200 Exposure of Sensitive Information to an Unauthorized Actor weakness

References