CVE-2021-44273: e2bn e2guardian

High severity, CVSS 7.4. EPSS: 1% chance of exploitation in the next 30 days.

e2guardian v5.4.x <= v5.4.3r is affected by missing SSL certificate validation in the SSL MITM engine. In standalone mode (i.e., acting as a proxy or a transparent proxy), with SSL MITM enabled, e2guardian, if built with OpenSSL v1.1.x, did not validate hostnames in certificates of the web servers that it connected to, and thus was itself vulnerable to MITM attacks.

Affected products

• e2bn e2guardian: from 5.4.0, up to and including 5.4.3r

Published 2021-12-23. Last modified 2026-06-17.