CVE-2021-44273

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Source
https://cve.org/CVERecord?id=CVE-2021-44273
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-44273.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2021-44273
Downstream
Published
2021-12-23T12:15:07Z
Modified
2026-07-09T02:36:09Z
Severity
  • 7.4 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N CVSS Calculator
Summary
[none]
Details

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

Affected packages

Git / github.com/e2guardian/e2guardian

Affected ranges

Type
GIT
Repo
https://github.com/e2guardian/e2guardian
Events
Introduced
0 Unknown introduced commit / All previous commits are affected
Last Affected
3ce57b50c9754bca39fabd1eaa1b69f0bbe223f9
Fixed
eae46a7e2a57103aadca903c4a24cca94dc502a2
Database specific
Show details 
{
    "cpe": "cpe:2.3:a:e2bn:e2guardian:*:*:*:*:*:*:*:*",
    "extracted_events": [
        {
            "introduced": "5.4.0"
        },
        {
            "last_affected": "5.4.3r"
        }
    ],
    "source": [
        "CPE_RANGE",
        "REFERENCES"
    ]
}

Affected versions

v3.*
v3.0.1
v3.0.2
v3.1.0
v3.1.1
v4.*
v4.0-beta0
v5.*
v5.0.0beta
v5.2.0
v5.3.2
v5.4.1-pre1
v5.4.2r-pre2
v5.4.3r

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-44273.json"
vanir_signatures 
[
    {
        "deprecated": false,
        "digest": {
            "function_hash": "225020943847239974401407156376740454469",
            "length": 2340
        },
        "id": "CVE-2021-44273-79006267",
        "signature_type": "Function",
        "signature_version": "v1",
        "source": "https://github.com/e2guardian/e2guardian/commit/eae46a7e2a57103aadca903c4a24cca94dc502a2",
        "target": {
            "file": "src/Socket.cpp",
            "function": "Socket::startSslClient"
        }
    },
    {
        "deprecated": false,
        "digest": {
            "line_hashes": [
                "51099355436612688877461331241952407539",
                "84869958030245548021741248928003404760",
                "311604252843514328573653834232659919309",
                "245098895109109632988598352585023675897"
            ],
            "threshold": 0.9
        },
        "id": "CVE-2021-44273-a848bf47",
        "signature_type": "Line",
        "signature_version": "v1",
        "source": "https://github.com/e2guardian/e2guardian/commit/eae46a7e2a57103aadca903c4a24cca94dc502a2",
        "target": {
            "file": "src/Socket.cpp"
        }
    }
]
vanir_signatures_modified 
"2026-07-09T02:36:09Z"