CVE-2022-20772: Cisco Email Security Appliance Firmware

Medium severity, CVSS 5.3. EPSS: 0.6% chance of exploitation in the next 30 days.

A vulnerability in Cisco Email Security Appliance (ESA) and Cisco Secure Email and Web Manager could allow an unauthenticated, remote attacker to conduct an HTTP response splitting attack. This vulnerability is due to the failure of the application or its environment to properly sanitize input values. An attacker could exploit this vulnerability by injecting malicious HTTP headers, controlling the response body, or splitting the response into multiple responses.

Affected products

• Cisco Email Security Appliance Firmware: from 13.5.1, before 14.0.3-015 (fixed in 14.0.3-015); from 14.1, before 14.2.1-015 (fixed in 14.2.1-015); from 14.3, before 14.3.0-023 (fixed in 14.3.0-023)
• Cisco Secure Email And Web Manager Firmware: from 14.2, before 14.2.0-217 (fixed in 14.2.0-217); from 14.3, before 14.3.0-115 (fixed in 14.3.0-115)

Published 2022-11-04. Last modified 2026-06-17.