{"id":"CVE-2020-15955","aliases":["EUVD-2020-7926","GHSA-3hf7-p43g-vpv6"],"status":"published","title":"In s/qmail through 4.0.07, an active MitM can inject arbitrary plaintext commands into a STARTTLS...","description":"In s/qmail through 4.0.07, an active MitM can inject arbitrary plaintext commands into a STARTTLS encrypted session between an SMTP client and s/qmail. This allows e-mail messages and user credentials to be sent to the MitM attacker.","severity":{"version":"3.1","score":5.9,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N","level":"medium","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-10","score":0.0095,"percentile":0.61531,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-77"],"published":"2021-08-17T17:12:09Z","modified":"2026-06-17T02:57:29Z","products":[{"vendor":"fehcom","product":"s\\/qmail"}],"references":[{"url":"https://www.fehcom.de/sqmail/sqmail.html","tags":["x_refsource_MISC","x_transferred","Patch","Release Notes","Vendor Advisory"]},{"url":"https://nostarttls.secvuln.info/","tags":["x_refsource_MISC","x_transferred","Technical Description","Third Party Advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2020-15955"},{"url":"https://github.com/advisories/GHSA-3hf7-p43g-vpv6"}],"sources":{"cve":[{"id":"CVE-2020-15955","description":"In s/qmail through 4.0.07, an active MitM can inject arbitrary plaintext commands into a STARTTLS encrypted session between an SMTP client and s/qmail. This allows e-mail messages and user credentials to be sent to the MitM attacker.","status":"published","published":"2021-08-17T17:12:09Z","modified":"2024-08-04T13:30:23.461Z","updated_at":"2026-11-02T14:35:50.228781Z"}],"euvd":[{"id":"EUVD-2020-7926","description":"In s/qmail through 4.0.07, an active MitM can inject arbitrary plaintext commands into a STARTTLS encrypted session between an SMTP client and s/qmail. This allows e-mail messages and user credentials to be sent to the MitM attacker.","status":"published","published":"2021-08-17T17:12:09Z","modified":"2024-08-04T13:30:23Z","updated_at":"2026-11-03T03:07:29.843843Z"}],"ghsa":[{"id":"GHSA-3hf7-p43g-vpv6","title":"In s/qmail through 4.0.07, an active MitM can inject arbitrary plaintext commands into a STARTTLS...","description":"In s/qmail through 4.0.07, an active MitM can inject arbitrary plaintext commands into a STARTTLS encrypted session between an SMTP client and s/qmail. This allows e-mail messages and user credentials to be sent to the MitM attacker.","status":"published","published":"2022-05-24T19:11:25Z","modified":"2023-01-30T05:01:36Z","cwes":["CWE-77"],"updated_at":"2026-11-02T14:46:26.905827Z"}],"nvd":[{"id":"CVE-2020-15955","description":"In s/qmail through 4.0.07, an active MitM can inject arbitrary plaintext commands into a STARTTLS encrypted session between an SMTP client and s/qmail. This allows e-mail messages and user credentials to be sent to the MitM attacker.","status":"published","published":"2021-08-17T18:15:06.99Z","modified":"2026-06-17T02:57:29.223Z","cvss":[{"version":"3.1","score":5.9,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N","level":"medium","assessor":"primary"},{"version":"2.0","score":4.3,"vector":"AV:N/AC:M/Au:N/C:P/I:N/A:N","level":"medium","assessor":"primary"}],"cwes":["CWE-77"],"updated_at":"2026-11-02T14:06:44.292752Z"}]}}