CVE-2021-44273

HIGH 7.4CVE-2021-44273 · Published 23/12/2021 · updated 17/06/2026

In short

CVE-2021-44273 is a HIGH (CVSS 7.4) vulnerability affecting e2guardian (e2bn).
Chance of exploitation in the next 30 days (EPSS): 1.0%, higher than 63.1% of all vulnerabilities.
No patched version is listed yet: follow the vendor's advisory in References.

Package	Affected versions	Patched versions
e2guardian e2bn	`≥ 5.4.0, ≤ 5.4.3r`	No fix yet

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

openwall.com/lists/oss-security/2021/12/23/2 · Mailing List
e2guardian/e2guardian commit eae46a7 · Patch
e2guardian/e2guardian · Exploit
lists.debian.org/debian-lts-announce/2023/09/msg00010.html

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