CVE-2021-44273

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.

• CWE-295

• http://www.openwall.com/lists/oss-security/2021/12/23/2Mailing List, Third Party Advisory
• https://github.com/e2guardian/e2guardian/commit/eae46a7e2a57103aadca903c4a24cca94dc502a2Patch, Third Party Advisory
• https://github.com/e2guardian/e2guardian/issues/707Exploit, Issue Tracking, Patch, Third Party Advisory
• https://lists.debian.org/debian-lts-announce/2023/09/msg00010.html
• http://www.openwall.com/lists/oss-security/2021/12/23/2Mailing List, Third Party Advisory
• https://github.com/e2guardian/e2guardian/commit/eae46a7e2a57103aadca903c4a24cca94dc502a2Patch, Third Party Advisory
• https://github.com/e2guardian/e2guardian/issues/707Exploit, Issue Tracking, Patch, Third Party Advisory
• https://lists.debian.org/debian-lts-announce/2023/09/msg00010.html

Published

Dec 23, 2021

Last Modified

Jun 17, 2026

Status

Modified

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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