CVE-2020-3117: Cisco Content Security Management Appliance

Medium severity, CVSS 4.7. EPSS: 0.9% chance of exploitation in the next 30 days.

A vulnerability in the API Framework of Cisco AsyncOS for Cisco Web Security Appliance (WSA) and Cisco Content Security Management Appliance (SMA) could allow an unauthenticated, remote attacker to inject crafted HTTP headers in the web server's response. The vulnerability is due to insufficient validation of user input. An attacker could exploit this vulnerability by persuading a user to access a crafted URL and receive a malicious HTTP response. A successful exploit could allow the attacker to inject arbitrary HTTP headers into valid HTTP responses sent to a user's browser.

Affected products

• Cisco Content Security Management Appliance: before 13.0.0-187 (fixed in 13.0.0-187)
• Cisco Web Security Appliance: version 11.8.0-382 only; version 12.0.1-268 only

Published 2020-09-23. Last modified 2026-06-17.