CVE-2016-1296: Cisco Web Security Appliance

High severity, CVSS 7.5. EPSS: 2.1% chance of exploitation in the next 30 days.

The proxy engine on Cisco Web Security Appliance (WSA) devices with software 8.5.3-055, 9.1.0-000, and 9.5.0-235 allows remote attackers to bypass intended proxy restrictions via a malformed HTTP method, aka Bug ID CSCux00848.

Affected products

• Cisco Web Security Appliance: version 8.5.3-055 only; version 9.1.0-000 only; version 9.5.0-235 only

Published 2016-01-20. Last modified 2026-06-17.