CVE-2021-34736: Cisco Unified Computing System

High severity, CVSS 7.5. EPSS: 1.3% chance of exploitation in the next 30 days.

A vulnerability in the web-based management interface of Cisco Integrated Management Controller (IMC) Software could allow an unauthenticated, remote attacker to cause the web-based management interface to unexpectedly restart. The vulnerability is due to insufficient input validation on the web-based management interface. An attacker could exploit this vulnerability by sending a crafted HTTP request to an affected device. A successful exploit could allow the attacker to cause the interface to restart, resulting in a denial of service (DoS) condition.

Affected products

• Cisco Unified Computing System: before 4.1\(2g\) (fixed in 4.1\(2g\)); from 4.2, before 4.2\(1b\) (fixed in 4.2\(1b\)); before 4.1\(3e\) (fixed in 4.1\(3e\))

Published 2021-10-21. Last modified 2026-06-17.