CVE-2020-3578: Cisco Adaptive Security Appliance Software

Medium severity, CVSS 6.5. EPSS: 1.2% chance of exploitation in the next 30 days.

A vulnerability in the web services interface of Cisco Adaptive Security Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to bypass a configured access rule and access parts of the WebVPN portal that are supposed to be blocked. The vulnerability is due to insufficient validation of URLs when portal access rules are configured. An attacker could exploit this vulnerability by accessing certain URLs on the affected device.

Affected products

• Cisco Adaptive Security Appliance Software: before 9.6.4.45 (fixed in 9.6.4.45); from 9.7, before 9.8.4.26 (fixed in 9.8.4.26); from 9.9, before 9.9.2.80 (fixed in 9.9.2.80); from 9.10, before 9.10.1.44 (fixed in 9.10.1.44); from 9.12, before 9.12.4.4 (fixed in 9.12.4.4); from 9.13, before 9.13.1.13 (fixed in 9.13.1.13); …
• Cisco Firepower Threat Defense: before 6.3.0.6 (fixed in 6.3.0.6); from 6.5.0, before 6.5.0.5 (fixed in 6.5.0.5); from 6.6.0, before 6.6.1 (fixed in 6.6.1)
• Cisco Secure Firewall Threat Defense: from 6.4.0, before 6.4.0.10 (fixed in 6.4.0.10)

Published 2020-10-21. Last modified 2026-08-11.