{"id":"CVE-2020-7957","aliases":["ALPINE-CVE-2020-7957","EUVD-2020-28877","GHSA-vg8f-j3m8-7g9v","openSUSE-SU-2024:10726-1","openSUSE-SU-2025:14715-1"],"status":"published","title":"The IMAP and LMTP components in Dovecot 2.3.9 before 2.3.9.3 mishandle snippet generation when...","description":"The IMAP and LMTP components in Dovecot 2.3.9 before 2.3.9.3 mishandle snippet generation when many characters must be read to compute the snippet and a trailing \u003e character exists. This causes a denial of service in which the recipient cannot read all of their messages.","severity":{"version":"3.0","score":3.1,"vector":"CVSS:3.0/AC:H/AV:N/A:L/C:N/I:N/PR:N/S:U/UI:R","level":"low","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-11","score":0.01877,"percentile":0.79698,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-20"],"published":"2020-02-12T16:50:56Z","modified":"2026-10-26T11:17:55Z","fixes":[{"ecosystem":"Alpine:v3.10","package":"dovecot","fixed_in":["2.3.10.1-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.11","package":"dovecot","fixed_in":["2.3.9.3-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.12","package":"dovecot","fixed_in":["2.3.9.3-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.13","package":"dovecot","fixed_in":["2.3.9.3-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.14","package":"dovecot","fixed_in":["2.3.9.3-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.15","package":"dovecot","fixed_in":["2.3.9.3-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.16","package":"dovecot","fixed_in":["2.3.9.3-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.17","package":"dovecot","fixed_in":["2.3.9.3-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.18","package":"dovecot","fixed_in":["2.3.9.3-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.19","package":"dovecot","fixed_in":["2.3.9.3-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.20","package":"dovecot","fixed_in":["2.3.9.3-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.21","package":"dovecot","fixed_in":["2.3.9.3-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.22","package":"dovecot","fixed_in":["2.3.9.3-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.23","package":"dovecot","fixed_in":["2.3.9.3-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.24","package":"dovecot","fixed_in":["2.3.9.3-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.8","package":"dovecot","fixed_in":["2.3.10.1-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.9","package":"dovecot","fixed_in":["2.3.10.1-r0"],"sources":["osv"]}],"affected":[{"source":"osv","ecosystem":"Alpine:v3.10","package":"dovecot","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"2.3.9"},{"fixed":"2.3.10.1-r0"}]}]},{"source":"osv","ecosystem":"Alpine:v3.11","package":"dovecot","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"2.3.9"},{"fixed":"2.3.9.3-r0"}]}]},{"source":"osv","ecosystem":"Alpine:v3.12","package":"dovecot","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"2.3.9"},{"fixed":"2.3.9.3-r0"}]}]},{"source":"osv","ecosystem":"Alpine:v3.13","package":"dovecot","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"2.3.9"},{"fixed":"2.3.9.3-r0"}]}]},{"source":"osv","ecosystem":"Alpine:v3.14","package":"dovecot","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"2.3.9"},{"fixed":"2.3.9.3-r0"}]}]},{"source":"osv","ecosystem":"Alpine:v3.15","package":"dovecot","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"2.3.9"},{"fixed":"2.3.9.3-r0"}]}]},{"source":"osv","ecosystem":"Alpine:v3.16","package":"dovecot","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"2.3.9"},{"fixed":"2.3.9.3-r0"}]}]},{"source":"osv","ecosystem":"Alpine:v3.17","package":"dovecot","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"2.3.9"},{"fixed":"2.3.9.3-r0"}]}]},{"source":"osv","ecosystem":"Alpine:v3.18","package":"dovecot","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"2.3.9"},{"fixed":"2.3.9.3-r0"}]}]},{"source":"osv","ecosystem":"Alpine:v3.19","package":"dovecot","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"2.3.9"},{"fixed":"2.3.9.3-r0"}]}]},{"source":"osv","ecosystem":"Alpine:v3.20","package":"dovecot","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"2.3.9"},{"fixed":"2.3.9.3-r0"}]}]},{"source":"osv","ecosystem":"Alpine:v3.21","package":"dovecot","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"2.3.9"},{"fixed":"2.3.9.3-r0"}]}]},{"source":"osv","ecosystem":"Alpine:v3.22","package":"dovecot","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"2.3.9"},{"fixed":"2.3.9.3-r0"}]}]},{"source":"osv","ecosystem":"Alpine:v3.23","package":"dovecot","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"2.3.9"},{"fixed":"2.3.9.3-r0"}]}]},{"source":"osv","ecosystem":"Alpine:v3.24","package":"dovecot","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"2.3.9"},{"fixed":"2.3.9.3-r0"}]}]},{"source":"osv","ecosystem":"Alpine:v3.8","package":"dovecot","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"2.3.9"},{"fixed":"2.3.10.1-r0"}]}]},{"source":"osv","ecosystem":"Alpine:v3.9","package":"dovecot","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"2.3.9"},{"fixed":"2.3.10.1-r0"}]}]},{"source":"osv","ecosystem":"openSUSE:Tumbleweed","package":"dovecot23","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.3.16-1.6"}]}],"bundled":22},{"source":"osv","ecosystem":"openSUSE:Tumbleweed","package":"dovecot24","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.4.0-1.1"}]}],"bundled":24}],"products":[{"vendor":"dovecot","product":"dovecot"},{"vendor":"fedoraproject","product":"fedora"}],"references":[{"url":"https://dovecot.org/security","tags":["x_refsource_MISC","x_transferred","Vendor Advisory","advisory"]},{"url":"http://www.openwall.com/lists/oss-security/2020/02/12/2","tags":["x_refsource_CONFIRM","x_transferred","Exploit","Mailing List","Third Party Advisory","evidence"]},{"url":"https://dovecot.org/pipermail/dovecot-news/2020-February/000430.html","tags":["x_refsource_CONFIRM","x_transferred","Exploit","Mailing List","Vendor Advisory","evidence"]},{"url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/6XYT55WH372BJOXCJRKBDIFGBMPVOIDT/","tags":["vendor-advisory","x_refsource_FEDORA","x_transferred","web"]},{"url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/NJXHOUT3FH2DJNMACSX4GHPP4MUV4UKA/","tags":["vendor-advisory","x_refsource_FEDORA","x_transferred","web"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2020-7957"},{"url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/6XYT55WH372BJOXCJRKBDIFGBMPVOIDT/"},{"url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/NJXHOUT3FH2DJNMACSX4GHPP4MUV4UKA/"},{"url":"https://github.com/advisories/GHSA-vg8f-j3m8-7g9v"},{"url":"https://security.alpinelinux.org/vuln/CVE-2020-7957","tags":["advisory"]},{"url":"","tags":["advisory"]},{"url":"https://www.suse.com/security/cve/CVE-2017-14461","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2017-15130","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2017-15132","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2019-10691","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2019-11494","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2019-11499","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2019-11500","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2019-19722","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2019-3814","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2019-7524","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2020-10957","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2020-10958","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2020-10967","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2020-12100","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2020-12673","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2020-12674","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2020-24386","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2020-28200","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2020-7046","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2020-7957","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2021-29157","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2021-33515","tags":["web"]},{"url":"https://lists.opensuse.org/archives/list/security-announce@lists.opensuse.org/thread/KZSDCZ5LA6IHY7KXVSL6ULAJVP6OFT2M/","tags":["advisory"]},{"url":"https://www.suse.com/security/cve/CVE-2024-23184","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2024-23185","tags":["web"]}],"sources":{"cve":[{"id":"CVE-2020-7957","description":"The IMAP and LMTP components in Dovecot 2.3.9 before 2.3.9.3 mishandle snippet generation when many characters must be read to compute the snippet and a trailing \u003e character exists. This causes a denial of service in which the recipient cannot read all of their messages.","status":"published","published":"2020-02-12T16:50:56Z","modified":"2024-08-04T09:48:24.611Z","cvss":[{"version":"3.0","score":3.1,"vector":"CVSS:3.0/AC:H/AV:N/A:L/C:N/I:N/PR:N/S:U/UI:R","level":"low","assessor":"cna"}],"updated_at":"2026-11-02T14:35:58.787905Z"}],"euvd":[{"id":"EUVD-2020-28877","description":"The IMAP and LMTP components in Dovecot 2.3.9 before 2.3.9.3 mishandle snippet generation when many characters must be read to compute the snippet and a trailing \u003e character exists. 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This causes a denial of service in which the recipient cannot read all of their messages.","status":"published","published":"2022-05-24T17:08:50Z","modified":"2023-01-29T05:01:40Z","cwes":["CWE-20"],"updated_at":"2026-11-02T14:44:53.095202Z"}],"nvd":[{"id":"CVE-2020-7957","description":"The IMAP and LMTP components in Dovecot 2.3.9 before 2.3.9.3 mishandle snippet generation when many characters must be read to compute the snippet and a trailing \u003e character exists. 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