{"id":"CVE-2021-35525","aliases":["DEBIAN-CVE-2021-35525","EUVD-2021-22161","GHSA-w799-rf9r-4rqc","UBUNTU-CVE-2021-35525"],"status":"published","title":"PostSRSd before 1.11 allows a denial of service (subprocess hang) if Postfix sends certain long...","description":"PostSRSd before 1.11 allows a denial of service (subprocess hang) if Postfix sends certain long data fields such as multiple concatenated email addresses. NOTE: the PostSRSd maintainer acknowledges \"theoretically, this error should never occur ... I'm not sure if there's a reliable way to trigger this condition by an external attacker, but it is a security bug in PostSRSd nevertheless.\"","severity":{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","level":"medium","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-11","score":0.01654,"percentile":0.7688,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"published":"2021-06-28T17:38:24Z","modified":"2026-10-23T18:03:30Z","fixes":[{"ecosystem":"Debian:12","package":"postsrsd","fixed_in":["1.10-2"],"sources":["osv"]},{"ecosystem":"Debian:13","package":"postsrsd","fixed_in":["1.10-2"],"sources":["osv"]},{"ecosystem":"Debian:14","package":"postsrsd","fixed_in":["1.10-2"],"sources":["osv"]}],"affected":[{"source":"osv","ecosystem":"Debian:12","package":"postsrsd","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.10-2"}]}]},{"source":"osv","ecosystem":"Debian:13","package":"postsrsd","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.10-2"}]}]},{"source":"osv","ecosystem":"Debian:14","package":"postsrsd","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.10-2"}]}]},{"source":"osv","ecosystem":"Ubuntu:16.04:LTS","package":"postsrsd","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.2-1"]},{"source":"osv","ecosystem":"Ubuntu:18.04:LTS","package":"postsrsd","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.4-1","1.4-1ubuntu0.1"]},{"source":"osv","ecosystem":"Ubuntu:20.04:LTS","package":"postsrsd","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.5-2"]},{"source":"osv","ecosystem":"Ubuntu:22.04:LTS","package":"postsrsd","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.10-2"]},{"source":"osv","ecosystem":"Ubuntu:24.04:LTS","package":"postsrsd","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.10-2","1.10-2.1build1"]},{"source":"osv","ecosystem":"Ubuntu:25.10","package":"postsrsd","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.10-2.2"]},{"source":"osv","ecosystem":"Ubuntu:26.04:LTS","package":"postsrsd","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.10-2.2","2.0.11-1"]}],"products":[{"vendor":"postsrsd_project","product":"postsrsd"}],"references":[{"url":"https://github.com/roehling/postsrsd/releases/tag/1.11","tags":["x_refsource_MISC","x_transferred","Release Notes","Third Party Advisory","advisory","report"]},{"url":"https://github.com/roehling/postsrsd/commit/077be98d8c8a9847e4ae0c7dc09e7474cbe27db2","tags":["x_refsource_MISC","x_transferred","Patch","Third Party Advisory","fix","report"]},{"url":"https://bugs.gentoo.org/793674","tags":["x_refsource_MISC","x_transferred","Issue Tracking","Patch","Release Notes","Third Party Advisory","fix","report"]},{"url":"https://security.gentoo.org/glsa/202107-08","tags":["vendor-advisory","x_refsource_GENTOO","x_transferred","Third Party Advisory","advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-35525"},{"url":"https://github.com/advisories/GHSA-w799-rf9r-4rqc"},{"url":"https://security-tracker.debian.org/tracker/CVE-2021-35525","tags":["advisory"]},{"url":"https://ubuntu.com/security/CVE-2021-35525","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2021-35525","tags":["report"]}],"sources":{"cve":[{"id":"CVE-2021-35525","description":"PostSRSd before 1.11 allows a denial of service (subprocess hang) if Postfix sends certain long data fields such as multiple concatenated email addresses. NOTE: the PostSRSd maintainer acknowledges \"theoretically, this error should never occur ... I'm not sure if there's a reliable way to trigger this condition by an external attacker, but it is a security bug in PostSRSd nevertheless.\"","status":"published","published":"2021-06-28T17:38:24Z","modified":"2024-08-04T00:40:46.38Z","updated_at":"2026-11-02T14:33:09.864034Z"}],"euvd":[{"id":"EUVD-2021-22161","description":"PostSRSd before 1.11 allows a denial of service (subprocess hang) if Postfix sends certain long data fields such as multiple concatenated email addresses. NOTE: the PostSRSd maintainer acknowledges \"theoretically, this error should never occur ... I'm not sure if there's a reliable way to trigger this condition by an external attacker, but it is a security bug in PostSRSd nevertheless.\"","status":"published","published":"2021-06-28T17:38:24Z","modified":"2024-08-04T00:40:46Z","updated_at":"2026-11-03T03:24:30.441845Z"}],"ghsa":[{"id":"GHSA-w799-rf9r-4rqc","title":"PostSRSd before 1.11 allows a denial of service (subprocess hang) if Postfix sends certain long...","description":"PostSRSd before 1.11 allows a denial of service (subprocess hang) if Postfix sends certain long data fields such as multiple concatenated email addresses. NOTE: the PostSRSd maintainer acknowledges \"theoretically, this error should never occur ... I'm not sure if there's a reliable way to trigger this condition by an external attacker, but it is a security bug in PostSRSd nevertheless.\"","status":"published","published":"2022-05-24T19:06:22Z","modified":"2023-01-30T05:00:34Z","updated_at":"2026-11-02T14:46:13.539888Z"}],"nvd":[{"id":"CVE-2021-35525","description":"PostSRSd before 1.11 allows a denial of service (subprocess hang) if Postfix sends certain long data fields such as multiple concatenated email addresses. NOTE: the PostSRSd maintainer acknowledges \"theoretically, this error should never occur ... I'm not sure if there's a reliable way to trigger this condition by an external attacker, but it is a security bug in PostSRSd nevertheless.\"","status":"published","published":"2021-06-28T18:15:08.03Z","modified":"2026-06-17T03:57:38.213Z","cvss":[{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","level":"medium","assessor":"primary"},{"version":"2.0","score":5,"vector":"AV:N/AC:L/Au:N/C:N/I:N/A:P","level":"medium","assessor":"primary"}],"updated_at":"2026-11-02T14:06:55.259633Z"}],"osv":[{"id":"CVE-2021-35525","description":"PostSRSd before 1.11 allows a denial of service (subprocess hang) if Postfix sends certain long data fields such as multiple concatenated email addresses. NOTE: the PostSRSd maintainer acknowledges \"theoretically, this error should never occur ... I'm not sure if there's a reliable way to trigger this condition by an external attacker, but it is a security bug in PostSRSd nevertheless.\"","status":"published","published":"2021-06-28T18:15:08.03Z","modified":"2026-10-20T14:25:22.397095438Z","cvss":[{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","level":"medium"}],"updated_at":"2026-11-02T15:44:20.13324Z"},{"id":"DEBIAN-CVE-2021-35525","description":"PostSRSd before 1.11 allows a denial of service (subprocess hang) if Postfix sends certain long data fields such as multiple concatenated email addresses. NOTE: the PostSRSd maintainer acknowledges \"theoretically, this error should never occur ... I'm not sure if there's a reliable way to trigger this condition by an external attacker, but it is a security bug in PostSRSd nevertheless.\"","status":"published","published":"2021-06-28T18:15:08.03Z","modified":"2026-10-23T18:03:30.06255553Z","cvss":[{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","level":"medium"}],"updated_at":"2026-11-02T15:45:35.233346Z"},{"id":"UBUNTU-CVE-2021-35525","description":"PostSRSd before 1.11 allows a denial of service (subprocess hang) if Postfix sends certain long data fields such as multiple concatenated email addresses. NOTE: the PostSRSd maintainer acknowledges \"theoretically, this error should never occur ... I'm not sure if there's a reliable way to trigger this condition by an external attacker, but it is a security bug in PostSRSd nevertheless.\"","status":"published","published":"2021-06-28T18:15:00Z","modified":"2026-05-20T16:05:04.677179516Z","cvss":[{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","level":"medium"}],"updated_at":"2026-11-02T15:54:27.870979Z"}]}}