{"id":"CVE-2017-2669","details":"Dovecot before version 2.2.29 is vulnerable to a denial of service. When 'dict' passdb and userdb were used for user authentication, the username sent by the IMAP/POP3 client was sent through var_expand() to perform %variable expansion. Sending specially crafted %variable fields could result in excessive memory usage causing the process to crash (and restart), or excessive CPU usage causing all authentications to hang.","modified":"2026-04-11T04:38:19.816730Z","published":"2018-06-21T13:29:00.317Z","related":["SUSE-SU-2017:1250-1"],"references":[{"type":"ADVISORY","url":"https://www.debian.org/security/2017/dsa-3828"},{"type":"ADVISORY","url":"http://www.openwall.com/lists/oss-security/2017/04/11/1"},{"type":"ADVISORY","url":"http://www.securityfocus.com/bid/97536"},{"type":"ADVISORY","url":"https://dovecot.org/pipermail/dovecot-news/2017-April/000341.html"},{"type":"ADVISORY","url":"https://github.com/dovecot/core/commit/000030feb7a30f193197f1aab8a7b04a26b42735.patch"},{"type":"REPORT","url":"https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2017-2669"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/dovecot/core","events":[{"introduced":"54d654098032d96975b70749b505fae538e97f7a"},{"last_affected":"bed84341d457ca12b3ffc2789f5ce5a50f473c17"},{"fixed":"000030feb7a30f193197f1aab8a7b04a26b42735"}],"database_specific":{"versions":[{"introduced":"2.2.26"},{"last_affected":"2.2.28"}]}}],"database_specific":{"vanir_signatures":[{"signature_type":"Line","source":"https://github.com/dovecot/core/commit/000030feb7a30f193197f1aab8a7b04a26b42735","id":"CVE-2017-2669-8b3a137b","deprecated":false,"target":{"file":"src/auth/db-dict.c"},"digest":{"line_hashes":["267636158964568098863636960298466532724","2352569610556384996954443346264017109","93946251500024901057239984742115296506","24637658557778190796647398033891828969","211611469493583939446357562940970616992","278277978705547623851111021639629407269","124382171383543376698073773677944138094","187087530198002650493950430766339868348","162450648597069746051999601511029220517"],"threshold":0.9},"signature_version":"v1"},{"signature_type":"Function","source":"https://github.com/dovecot/core/commit/000030feb7a30f193197f1aab8a7b04a26b42735","id":"CVE-2017-2669-a636a152","deprecated":false,"target":{"file":"src/auth/db-dict.c","function":"db_dict_iter_lookup_key_values"},"digest":{"function_hash":"258390715530272175125914701927623207390","length":1242},"signature_version":"v1"}],"unresolved_ranges":[{"events":[{"introduced":"0"},{"last_affected":"8.0"}]}],"vanir_signatures_modified":"2026-04-11T04:38:19Z","source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2017-2669.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"}]}