{"id":"CVE-2025-43921","aliases":["EUVD-2025-12590","GHSA-ch5j-3wwr-pjvh","UBUNTU-CVE-2025-43921"],"status":"disputed","title":"GNU Mailman 2.1.39, as bundled in cPanel (and WHM), allows unauthenticated attackers to create...","description":"GNU Mailman 2.1.39, as bundled in cPanel (and WHM), allows unauthenticated attackers to create lists via the /mailman/create endpoint. NOTE: multiple third parties report that they are unable to reproduce this, regardless of whether cPanel or WHM is used.","severity":{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-12","score":0.00482,"percentile":0.4204,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":true,"fix_available":false},"cwes":["CWE-863"],"published":"2025-04-20T00:00:00Z","modified":"2026-06-17T09:24:44Z","exploits":[{"source":"pocgithub","id":"0NYX-MY7H/CVE-2025-43921","title":"0NYX-MY7H/CVE-2025-43921","date":"2025-04-20","url":"https://github.com/0NYX-MY7H/CVE-2025-43921"}],"products":[{"vendor":"gnu","product":"mailman"}],"references":[{"url":"https://code.launchpad.net/~mailman-coders/mailman/2.1","tags":["Product","report"]},{"url":"https://github.com/0NYX-MY7H/CVE-2025-43921","tags":["Exploit","Third Party Advisory","report"]},{"url":"https://github.com/cpanel/mailman2-python3"},{"url":"https://www.openwall.com/lists/oss-security/2025/04/21/6"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2025-43921"},{"url":"https://github.com/advisories/GHSA-ch5j-3wwr-pjvh"},{"url":"https://ubuntu.com/security/CVE-2025-43921","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2025-43921","tags":["report"]}],"sources":{"cve":[{"id":"CVE-2025-43921","description":"GNU Mailman 2.1.39, as bundled in cPanel (and WHM), allows unauthenticated attackers to create lists via the /mailman/create endpoint. NOTE: multiple third parties report that they are unable to reproduce this, regardless of whether cPanel or WHM is used.","status":"disputed","published":"2025-04-20T00:00:00Z","modified":"2025-04-28T13:45:41.386Z","cvss":[{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N","level":"medium","assessor":"cna"}],"cwes":["CWE-863"],"updated_at":"2026-11-02T14:32:26.964524Z"}],"euvd":[{"id":"EUVD-2025-12590","description":"GNU Mailman 2.1.39, as bundled in cPanel (and WHM), allows unauthenticated attackers to create lists via the /mailman/create endpoint. NOTE: multiple third parties report that they are unable to reproduce this, regardless of whether cPanel or WHM is used.","status":"published","published":"2025-04-20T00:00:00Z","modified":"2025-04-28T13:45:41Z","cvss":[{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N","level":"medium"}],"updated_at":"2026-11-02T20:52:02.061871Z"}],"ghsa":[{"id":"GHSA-ch5j-3wwr-pjvh","title":"GNU Mailman 2.1.39, as bundled in cPanel (and WHM), allows unauthenticated attackers to create...","description":"GNU Mailman 2.1.39, as bundled in cPanel (and WHM), allows unauthenticated attackers to create lists via the /mailman/create endpoint.","status":"published","published":"2025-04-20T03:50:41Z","modified":"2025-04-28T15:32:43Z","cvss":[{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N","level":"medium"}],"cwes":["CWE-863"],"updated_at":"2026-11-02T15:02:02.838203Z"}],"nvd":[{"id":"CVE-2025-43921","description":"GNU Mailman 2.1.39, as bundled in cPanel (and WHM), allows unauthenticated attackers to create lists via the /mailman/create endpoint. NOTE: multiple third parties report that they are unable to reproduce this, regardless of whether cPanel or WHM is used.","status":"disputed","published":"2025-04-20T01:15:46.043Z","modified":"2026-06-17T09:24:44.82Z","cvss":[{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N","level":"medium","assessor":"secondary"},{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N","level":"medium","assessor":"primary"}],"cwes":["CWE-863"],"updated_at":"2026-11-02T14:11:01.507281Z"}],"osv":[{"id":"UBUNTU-CVE-2025-43921","description":"GNU Mailman 2.1.39, as bundled in cPanel (and WHM), allows unauthenticated attackers to create lists via the /mailman/create endpoint. NOTE: multiple third parties report that they are unable to reproduce this, regardless of whether cPanel or WHM is used.","status":"withdrawn","published":"2025-04-20T01:15:00Z","modified":"2026-03-03T06:09:43.427132Z","cvss":[{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N","level":"medium"},{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N","level":"medium"}],"updated_at":"2026-11-02T16:55:50.31802Z"}]}}