What’s Vulnerable › Vulnerabilities

CVE-2022-20772

• Severity: medium (CVSS 5.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.6% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2022-11-04 · updated 2026-06-17
• Weakness: CWE-113

Description

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

How to fix

Upgrade to a fixed version: Cisco Email Security Appliance 14.0.3-015, 14.2.1-015, 14.3.0-023; Cisco Secure Email And Web Manager Firmware 14.2.0-217, 14.3.0-115. Check the vendor advisory for mitigations.

References

• https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ESA-HTTP-Inject-nvsycUmR
• https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ESA-HTTP-Inject-nvsycUmR

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