What’s Vulnerable › Vulnerabilities

CVE-2022-20750: Cisco Redundancy Configuration Manager for Cisco StarOS Software TCP Denial of Service Vulnerability

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.1% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2022-02-17 · updated 2026-06-17
• Weakness: CWE-20

Description

A vulnerability in the checkpoint manager implementation of Cisco Redundancy Configuration Manager (RCM) for Cisco StarOS Software could allow an unauthenticated, remote attacker to cause the checkpoint manager process to restart upon receipt of malformed TCP data. This vulnerability is due to improper input validation of an ingress TCP packet. An attacker could exploit this vulnerability by sending crafted TCP data to the affected application. A successful exploit could allow the attacker to cause a denial of service (DoS) condition due to the checkpoint manager process restarting.

Affected products

• Cisco Redundancy Configuration Manager: before 21.24.0 — fixed in 21.24.0

How to fix

Upgrade to a fixed version: Cisco Redundancy Configuration Manager 21.24.0. Check the vendor advisory for mitigations.

References

• https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-rcm-tcp-dos-2Wh8XjAQ
• https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-rcm-tcp-dos-2Wh8XjAQ

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