CVE-2017-3870: Cisco Web Security Appliance

Medium severity, CVSS 5.8. EPSS: 1.5% chance of exploitation in the next 30 days.

A vulnerability in the URL filtering feature of Cisco AsyncOS Software for Cisco Web Security Appliance (WSA) could allow an unauthenticated, remote attacker to bypass a configured URL filter rule. Affected Products: This vulnerability affects all releases prior to the first fixed release of Cisco AsyncOS Software for Cisco Web Security Appliance (WSA), both virtual and hardware appliances, that are configured with URL filters for email scanning. More Information: CSCvc69700. Known Affected Releases: 8.5.3-069 9.1.1-074 9.1.2-010.

Affected products

• Cisco Web Security Appliance: version 8.5.3-069 only; version 9.1.1-074 only; version 9.1.2-010 only

Published 2017-03-17. Last modified 2026-06-17.