CVE-2019-3643: McAfee Active Response

High severity, CVSS 7.5. EPSS: 2.4% chance of exploitation in the next 30 days.

McAfee Web Gateway (MWG) earlier than 7.8.2.13 is vulnerable to a remote attacker exploiting CVE-2019-9511, potentially leading to a denial of service. This affects the scanning proxies.

Affected products

• McAfee Active Response: version 1.0.0 only; version 1.1.0 only; version 2.0 only; version 2.0.1 only; version 2.1 only; version 2.2 only; …
• McAfee Advanced Threat Defense: version 4.0 only; version 4.2 only; version 4.4 only; version 4.6 only
• McAfee Enterprise Security Manager: version 10.2.0 only; version 10.3.4 only; version 10.4.0 only; version 11.0.0 only; version 11.1.0 only; version 11.1.1 only; …
• McAfee Web Gateway: from 7.7.2.0, before 7.7.2.24 (fixed in 7.7.2.24); from 7.8.2, before 7.8.2.13 (fixed in 7.8.2.13); from 8.0.0, before 8.2.0 (fixed in 8.2.0)

Published 2019-09-11. Last modified 2026-06-17.