ubuntu-cve-2025-43920
Vulnerability from osv_ubuntu
Published
2025-04-20 01:15
Modified
2025-10-24 05:23
Summary
Details

GNU Mailman 2.1.39, as bundled in cPanel (and WHM), in certain external archiver configurations, allows unauthenticated attackers to execute arbitrary OS commands via shell metacharacters in an email Subject line. NOTE: multiple third parties report that they are unable to reproduce this, regardless of whether cPanel or WHM is used.

Severity
5.4 (Medium)
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:N
8.1 (High)
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
N/A (UNKNOWN)
medium
References
To clipboard 

{
  "affected": [
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "mailman",
            "binary_version": "1:2.1.20-1ubuntu0.6+esm2"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:16.04:LTS",
        "name": "mailman",
        "purl": "pkg:deb/ubuntu/mailman@1:2.1.20-1ubuntu0.6+esm2?arch=source\u0026distro=esm-infra/xenial"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1:2.1.20-1",
        "1:2.1.20-1ubuntu0.1",
        "1:2.1.20-1ubuntu0.3",
        "1:2.1.20-1ubuntu0.4",
        "1:2.1.20-1ubuntu0.5",
        "1:2.1.20-1ubuntu0.6",
        "1:2.1.20-1ubuntu0.6+esm1",
        "1:2.1.20-1ubuntu0.6+esm2"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "mailman",
            "binary_version": "1:2.1.26-1ubuntu0.6"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:18.04:LTS",
        "name": "mailman",
        "purl": "pkg:deb/ubuntu/mailman@1:2.1.26-1ubuntu0.6?arch=source\u0026distro=bionic"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1:2.1.23-1",
        "1:2.1.24-1",
        "1:2.1.25-1",
        "1:2.1.26-1",
        "1:2.1.26-1ubuntu0.1",
        "1:2.1.26-1ubuntu0.2",
        "1:2.1.26-1ubuntu0.3",
        "1:2.1.26-1ubuntu0.4",
        "1:2.1.26-1ubuntu0.5",
        "1:2.1.26-1ubuntu0.6"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "mailman",
            "binary_version": "1:2.1.29-1ubuntu3.1+esm1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:20.04:LTS",
        "name": "mailman",
        "purl": "pkg:deb/ubuntu/mailman@1:2.1.29-1ubuntu3.1+esm1?arch=source\u0026distro=esm-apps/focal"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1:2.1.29-1",
        "1:2.1.29-1build1",
        "1:2.1.29-1ubuntu3",
        "1:2.1.29-1ubuntu3.1",
        "1:2.1.29-1ubuntu3.1+esm1"
      ]
    }
  ],
  "aliases": [],
  "details": "GNU Mailman 2.1.39, as bundled in cPanel (and WHM), in certain external archiver configurations, allows unauthenticated attackers to execute arbitrary OS commands via shell metacharacters in an email Subject line. NOTE: multiple third parties report that they are unable to reproduce this, regardless of whether cPanel or WHM is used.",
  "id": "UBUNTU-CVE-2025-43920",
  "modified": "2025-10-24T05:23:32Z",
  "published": "2025-04-20T01:15:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2025-43920"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2025-43920"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/0NYX-MY7H/CVE-2025-43920"
    },
    {
      "type": "REPORT",
      "url": "https://code.launchpad.net/~mailman-coders/mailman/2.1"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:N",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2025-43920"
  ],
  "withdrawn": "2026-03-03T05:33:15Z"
}



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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
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  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


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