CVE-2019-3569: Facebook Hhvm

High severity, CVSS 7.5. EPSS: 1.5% chance of exploitation in the next 30 days.

HHVM, when used with FastCGI, would bind by default to all available interfaces. This behavior could allow a malicious individual unintended direct access to the application, which could result in information disclosure. This issue affects versions 4.3.0, 4.4.0, 4.5.0, 4.6.0, 4.7.0, 4.8.0, versions 3.30.5 and below, and all versions in the 4.0, 4.1, and 4.2 series.

Affected products

• Facebook Hhvm: up to and including 3.30.5; version 4.0.0 only; version 4.0.1 only; version 4.0.2 only; version 4.0.3 only; version 4.0.4 only; …

Published 2019-06-26. Last modified 2026-06-17.