{"id":"CVE-2020-28018","details":"Exim 4 before 4.94.2 allows Use After Free in smtp_reset in certain situations that may be common for builds with OpenSSL.","modified":"2026-05-30T16:35:11.628340Z","published":"2021-05-06T13:15:09.560Z","related":["openSUSE-SU-2021:0677-1","openSUSE-SU-2021:0753-1","openSUSE-SU-2021:0754-1","openSUSE-SU-2024:10746-1"],"references":[{"type":"ADVISORY","url":"http://www.openwall.com/lists/oss-security/2021/05/11/14"},{"type":"ADVISORY","url":"http://www.openwall.com/lists/oss-security/2021/05/11/15"},{"type":"ADVISORY","url":"http://www.openwall.com/lists/oss-security/2021/05/11/17"},{"type":"ADVISORY","url":"http://www.openwall.com/lists/oss-security/2021/05/11/5"},{"type":"ADVISORY","url":"http://www.openwall.com/lists/oss-security/2021/05/11/6"},{"type":"ADVISORY","url":"http://www.openwall.com/lists/oss-security/2021/05/12/2"},{"type":"ADVISORY","url":"http://www.openwall.com/lists/oss-security/2021/05/12/3"},{"type":"ADVISORY","url":"https://www.exim.org/static/doc/security/CVE-2020-qualys/CVE-2020-28018-OCORK.txt"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/exim/exim","events":[{"introduced":"d21bf202dbce10f259310dffcc6993f4d9886e56"},{"fixed":"919111edac911ba9c15422eafd7c5bf14d416d26"}],"database_specific":{"source":"CPE_RANGE","extracted_events":[{"introduced":"4.90"},{"fixed":"4.94.2"}],"cpe":"cpe:2.3:a:exim:exim:*:*:*:*:*:*:*:*"}}],"versions":["exim-4.94.1","exim-4.94","exim-4.94-RC2","exim-4.94-RC1","exim-4_94_RC0","exim-4.93","exim-4.93-RC7","exim-4.93-RC6","exim-4.93-RC5","exim-4.93-RC4","exim-4.93-RC3","exim-4.93-RC2","exim-4.93-RC1","exim-4.93-RC0","exim-4.92-jgh","exim-4.92-RC6","exim-4.92","exim-4.92-RC5","exim-4.92-RC4","exim-4.92-RC3","exim-4.92-RC2","exim-4.92-RC1","exim-4_91","exim-4_91_RC4","exim-4_91_RC3","exim-4_91_RC2","exim-4_91_RC1","exim-4_90_RC4","exim-4_90"],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2020-28018.json","vanir_signatures_modified":"2026-05-30T16:35:11Z","vanir_signatures":[{"id":"CVE-2020-28018-a5b97121","digest":{"length":86,"function_hash":"85807556721849417698167290800033609961"},"target":{"function":"bdat_ungetc","file":"src/src/smtp_in.c"},"deprecated":false,"source":"https://github.com/exim/exim/commit/919111edac911ba9c15422eafd7c5bf14d416d26","signature_version":"v1","signature_type":"Function"},{"id":"CVE-2020-28018-f33c15e3","digest":{"line_hashes":["2970847905863908930961351479348962244","259127508678304675853565838131490768076","16856440449629165604374376294870505588","21031574626938302228709321949938569854","66694532801356984293692391694813765468","228435147706632689035739186300622821874","137018139142916213668559470023354199721","262955889687131153967951266340364206508","122233694988885115887188843215612136724","55546132595750780137850156557040648213","178043897109541241882122479475000937559","311496951671523793228361465075141960070"],"threshold":0.9},"target":{"file":"src/src/smtp_in.c"},"deprecated":false,"source":"https://github.com/exim/exim/commit/919111edac911ba9c15422eafd7c5bf14d416d26","signature_version":"v1","signature_type":"Line"}]}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"}]}