{"id":"CVE-2021-46853","aliases":["DEBIAN-CVE-2021-46853","EUVD-2021-33507","GHSA-v9q2-jxcm-rm4c","UBUNTU-CVE-2021-46853","USN-7360-1"],"status":"published","title":"Alpine before 2.25 allows remote attackers to cause a denial of service (daemon crash) when LIST...","description":"Alpine before 2.25 allows remote attackers to cause a denial of service (application crash) when LIST or LSUB is sent before STARTTLS.","severity":{"version":"3.1","score":5.9,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"medium","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-11","score":0.01147,"percentile":0.67194,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-367"],"published":"2022-11-03T00:00:00Z","modified":"2026-10-23T18:04:17Z","fixes":[{"ecosystem":"Debian:12","package":"alpine","fixed_in":["2.25+dfsg1-1"],"sources":["osv"]},{"ecosystem":"Debian:13","package":"alpine","fixed_in":["2.25+dfsg1-1"],"sources":["osv"]},{"ecosystem":"Debian:14","package":"alpine","fixed_in":["2.25+dfsg1-1"],"sources":["osv"]},{"ecosystem":"Ubuntu:Pro:16.04:LTS","package":"alpine","fixed_in":["2.20+dfsg1-2ubuntu0.1~esm1"],"sources":["osv"]},{"ecosystem":"Ubuntu:Pro:18.04:LTS","package":"alpine","fixed_in":["2.21+dfsg1-1ubuntu0.1~esm1"],"sources":["osv"]},{"ecosystem":"Ubuntu:Pro:20.04:LTS","package":"alpine","fixed_in":["2.22+dfsg1-1ubuntu0.1~esm1"],"sources":["osv"]}],"affected":[{"source":"osv","ecosystem":"Debian:12","package":"alpine","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.25+dfsg1-1"}]}]},{"source":"osv","ecosystem":"Debian:13","package":"alpine","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.25+dfsg1-1"}]}]},{"source":"osv","ecosystem":"Debian:14","package":"alpine","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.25+dfsg1-1"}]}]},{"source":"osv","ecosystem":"Ubuntu:Pro:16.04:LTS","package":"alpine","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.20+dfsg1-2ubuntu0.1~esm1"}]}],"versions":["2.20+dfsg1-1","2.20+dfsg1-2"]},{"source":"osv","ecosystem":"Ubuntu:Pro:18.04:LTS","package":"alpine","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.21+dfsg1-1ubuntu0.1~esm1"}]}],"versions":["2.20+dfsg1-7","2.21+dfsg1-1","2.21+dfsg1-1build1"]},{"source":"osv","ecosystem":"Ubuntu:Pro:20.04:LTS","package":"alpine","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.22+dfsg1-1ubuntu0.1~esm1"}]}],"versions":["2.21+dfsg1-1.1build1","2.22+dfsg1-1"]},{"source":"osv","ecosystem":"Ubuntu:Pro:16.04:LTS","package":"alpine","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.20+dfsg1-2ubuntu0.1~esm1"}]}],"versions":["2.20+dfsg1-1","2.20+dfsg1-2"],"bundled":3},{"source":"osv","ecosystem":"Ubuntu:Pro:18.04:LTS","package":"alpine","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.21+dfsg1-1ubuntu0.1~esm1"}]}],"versions":["2.20+dfsg1-7","2.21+dfsg1-1","2.21+dfsg1-1build1"],"bundled":3},{"source":"osv","ecosystem":"Ubuntu:Pro:20.04:LTS","package":"alpine","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.22+dfsg1-1ubuntu0.1~esm1"}]}],"versions":["2.21+dfsg1-1.1build1","2.22+dfsg1-1"],"bundled":3}],"products":[{"vendor":"alpine_project","product":"alpine"}],"references":[{"url":"https://nostarttls.secvuln.info/","tags":["x_transferred","Technical Description","Third Party Advisory","advisory","report"]},{"url":"https://bugs.gentoo.org/807613","tags":["x_transferred","Issue Tracking","Third Party Advisory","report"]},{"url":"https://security.gentoo.org/glsa/202301-07","tags":["vendor-advisory","x_transferred","Third Party Advisory","advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-46853"},{"url":"https://nostarttls.secvuln.info","tags":["report"]},{"url":"https://github.com/advisories/GHSA-v9q2-jxcm-rm4c"},{"url":"https://security-tracker.debian.org/tracker/CVE-2021-46853","tags":["advisory"]},{"url":"https://ubuntu.com/security/CVE-2021-46853","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2021-46853","tags":["report"]},{"url":"https://ubuntu.com/security/notices/USN-7360-1","tags":["advisory"]},{"url":"https://ubuntu.com/security/CVE-2020-14929","tags":["report"]},{"url":"https://ubuntu.com/security/CVE-2021-38370","tags":["report"]}],"sources":{"cve":[{"id":"CVE-2021-46853","description":"Alpine before 2.25 allows remote attackers to cause a denial of service (application crash) when LIST or LSUB is sent before STARTTLS.","status":"published","published":"2022-11-03T00:00:00Z","modified":"2025-05-05T13:38:19.086Z","cvss":[{"version":"3.1","score":5.9,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"medium","assessor":"adp"}],"cwes":["CWE-367"],"updated_at":"2026-11-02T14:33:03.320536Z"}],"euvd":[{"id":"EUVD-2021-33507","description":"Alpine before 2.25 allows remote attackers to cause a denial of service (application crash) when LIST or LSUB is sent before STARTTLS.","status":"published","published":"2022-11-03T00:00:00Z","modified":"2025-05-05T13:38:19Z","cvss":[{"version":"3.1","score":5.9,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"medium"}],"updated_at":"2026-11-02T20:51:53.049769Z"}],"ghsa":[{"id":"GHSA-v9q2-jxcm-rm4c","title":"Alpine before 2.25 allows remote attackers to cause a denial of service (daemon crash) when LIST...","description":"Alpine before 2.25 allows remote attackers to cause a denial of service (daemon crash) when LIST or LSUB is sent before STARTTLS.","status":"published","published":"2022-11-03T12:00:26Z","modified":"2025-05-05T15:31:45Z","cvss":[{"version":"3.1","score":5.9,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"medium"}],"cwes":["CWE-367"],"updated_at":"2026-11-02T15:02:06.913728Z"}],"nvd":[{"id":"CVE-2021-46853","description":"Alpine before 2.25 allows remote attackers to cause a denial of service (application crash) when LIST or LSUB is sent before STARTTLS.","status":"published","published":"2022-11-03T06:15:09.76Z","modified":"2026-06-17T04:15:40.5Z","cvss":[{"version":"3.1","score":5.9,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"medium","assessor":"primary"},{"version":"3.1","score":5.9,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"medium","assessor":"secondary"}],"cwes":["CWE-367"],"updated_at":"2026-11-02T14:07:06.906968Z"}],"osv":[{"id":"CVE-2021-46853","description":"Alpine before 2.25 allows remote attackers to cause a denial of service (application crash) when LIST or LSUB is sent before STARTTLS.","status":"published","published":"2022-11-03T06:15:09.76Z","modified":"2026-03-15T22:42:39.697126Z","cvss":[{"version":"3.1","score":5.9,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"medium"}],"updated_at":"2026-11-02T15:44:22.18434Z"},{"id":"DEBIAN-CVE-2021-46853","description":"Alpine before 2.25 allows remote attackers to cause a denial of service (application crash) when LIST or LSUB is sent before STARTTLS.","status":"published","published":"2022-11-03T06:15:09.76Z","modified":"2026-10-23T18:04:17.621532308Z","cvss":[{"version":"3.1","score":5.9,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"medium"}],"updated_at":"2026-11-02T15:45:35.799676Z"},{"id":"UBUNTU-CVE-2021-46853","description":"Alpine before 2.25 allows remote attackers to cause a denial of service (application crash) when LIST or LSUB is sent before STARTTLS.","status":"published","published":"2022-11-03T06:15:00Z","modified":"2026-02-04T03:00:43.688085Z","cvss":[{"version":"3.1","score":5.9,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"medium"},{"version":"3.1","score":5.9,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"medium"}],"updated_at":"2026-11-02T15:54:30.277322Z"},{"id":"USN-7360-1","title":"alpine vulnerabilities","description":"It was discovered that Alpine did not use a secure connection under\ncertain circumstances. A remote attacker could possibly use this issue to\nleak sensitive information. (CVE-2020-14929)\n\nIt was discovered that Alpine could allow untagged responses from an\nIMAP server before upgrading to a TLS connection. A remote attacker could\npossibly use this issue to leak sensitive information. (CVE-2021-38370)\n\nIt was discovered that Alpine could crash when receiving certain SMTP\ncommands. A remote attacker could possibly use this issue to cause a denial\nof service. (CVE-2021-46853)\n","status":"published","published":"2025-03-20T00:37:09Z","modified":"2026-06-25T13:32:19.393957414Z","updated_at":"2026-11-02T16:58:19.988474Z"}]}}