CVE-2021-44273

HIGH

e2guardian 5.4.0-5.4.3r - Missing SSL Certificate Validation in MITM Engine

Title source: llm
STIX 2.1

Description

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.

References (4)

Core 4
Core References
Mailing List, Third Party Advisory mailing-list
http://www.openwall.com/lists/oss-security/2021/12/23/2
Exploit, Issue Tracking, Patch, Third Party Advisory
https://github.com/e2guardian/e2guardian/issues/707

Scores

CVSS v3 7.4
EPSS 0.0096
EPSS Percentile 57.0%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N

Details

CWE
CWE-295
Status published
Products (1)
e2bn/e2guardian 5.4.0 - 5.4.3r
Published Dec 23, 2021
Tracked Since Feb 18, 2026