{"id":"CVE-2016-9963","aliases":["DEBIAN-CVE-2016-9963","DLA-762-1","DSA-3747-1","EUVD-2016-10748","GHSA-qf64-f8r5-29m4","UBUNTU-CVE-2016-9963","USN-3164-1","openSUSE-SU-2024:10746-1"],"status":"published","title":"Exim before 4.87.1 might allow remote attackers to obtain the private DKIM signing key via...","description":"Exim before 4.87.1 might allow remote attackers to obtain the private DKIM signing key via vectors related to log files and bounce messages.","severity":{"version":"3.0","score":5.9,"vector":"CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N","level":"medium","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-07","score":0.03098,"percentile":0.87822,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-320"],"published":"2016-12-16T00:00:00Z","modified":"2026-10-24T10:30:58Z","fixes":[{"ecosystem":"Debian:12","package":"exim4","fixed_in":["4.88~RC6-2"],"sources":["osv"]},{"ecosystem":"Debian:13","package":"exim4","fixed_in":["4.88~RC6-2"],"sources":["osv"]},{"ecosystem":"Debian:14","package":"exim4","fixed_in":["4.88~RC6-2"],"sources":["osv"]},{"ecosystem":"Debian:7","package":"exim4","fixed_in":["4.80-7+deb7u4"],"sources":["osv"]},{"ecosystem":"Debian:8","package":"exim4","fixed_in":["4.84.2-2+deb8u2"],"sources":["osv"]},{"ecosystem":"Ubuntu:14.04:LTS","package":"exim4","fixed_in":["4.82-3ubuntu2.2"],"sources":["osv"]},{"ecosystem":"Ubuntu:16.04:LTS","package":"exim4","fixed_in":["4.86.2-2ubuntu2.1"],"sources":["osv"]}],"affected":[{"source":"osv","ecosystem":"Debian:12","package":"exim4","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"4.88~RC6-2"}]}]},{"source":"osv","ecosystem":"Debian:13","package":"exim4","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"4.88~RC6-2"}]}]},{"source":"osv","ecosystem":"Debian:14","package":"exim4","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"4.88~RC6-2"}]}]},{"source":"osv","ecosystem":"Debian:7","package":"exim4","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"4.80-7+deb7u4"}]}],"versions":["4.80-7","4.80-7+deb7u1","4.80-7+deb7u2","4.80-7+deb7u3"]},{"source":"osv","ecosystem":"Debian:8","package":"exim4","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"4.84.2-2+deb8u2"}]}],"versions":["4.84-8","4.84-8+deb8u1","4.84-8+deb8u2","4.84.2-1","4.84.2-1+deb8u1","4.84.2-2","4.84.2-2+deb8u1"]},{"source":"osv","ecosystem":"Ubuntu:14.04:LTS","package":"exim4","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"4.82-3ubuntu2.2"}]}],"versions":["4.80-7ubuntu3","4.80-7ubuntu4","4.80-9ubuntu1","4.80-9ubuntu2","4.82-3ubuntu1","4.82-3ubuntu2","4.82-3ubuntu2.1"]},{"source":"osv","ecosystem":"Ubuntu:16.04:LTS","package":"exim4","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"4.86.2-2ubuntu2.1"}]}],"versions":["4.86-3ubuntu1","4.86-7ubuntu1","4.86-7ubuntu2","4.86-7ubuntu3","4.86.2-2ubuntu1","4.86.2-2ubuntu2"]},{"source":"osv","ecosystem":"Ubuntu:14.04:LTS","package":"exim4","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"4.82-3ubuntu2.2"}]}],"versions":["4.80-7ubuntu3","4.80-7ubuntu4","4.80-9ubuntu1","4.80-9ubuntu2","4.82-3ubuntu1","4.82-3ubuntu2","4.82-3ubuntu2.1"]},{"source":"osv","ecosystem":"Ubuntu:16.04:LTS","package":"exim4","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"4.86.2-2ubuntu2.1"}]}],"versions":["4.86-3ubuntu1","4.86-7ubuntu1","4.86-7ubuntu2","4.86-7ubuntu3","4.86.2-2ubuntu1","4.86.2-2ubuntu2"]},{"source":"osv","ecosystem":"openSUSE:Tumbleweed","package":"exim","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"4.94.2-4.2"}]}],"bundled":31}],"products":[{"vendor":"canonical","product":"ubuntu_linux"},{"vendor":"debian","product":"debian_linux"},{"vendor":"exim","product":"exim"}],"references":[{"url":"http://www.debian.org/security/2016/dsa-3747","tags":["vendor-advisory","x_refsource_DEBIAN","x_transferred","Third Party Advisory","advisory"]},{"url":"http://www.exim.org/static/doc/CVE-2016-9963.txt","tags":["x_refsource_CONFIRM","x_transferred","Mitigation","Vendor Advisory","advisory"]},{"url":"http://www.ubuntu.com/usn/USN-3164-1","tags":["vendor-advisory","x_refsource_UBUNTU","x_transferred","Third Party Advisory","advisory"]},{"url":"https://bugs.exim.org/show_bug.cgi?id=1996","tags":["x_refsource_CONFIRM","x_transferred","Issue Tracking","Mitigation","Vendor Advisory","report"]},{"url":"http://www.securitytracker.com/id/1037484","tags":["vdb-entry","x_refsource_SECTRACK","x_transferred","Third Party Advisory","VDB Entry","advisory"]},{"url":"http://www.securityfocus.com/bid/94947","tags":["vdb-entry","x_refsource_BID","x_transferred","Third Party Advisory","VDB Entry","advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2016-9963"},{"url":"https://github.com/advisories/GHSA-qf64-f8r5-29m4"},{"url":"https://security-tracker.debian.org/tracker/CVE-2016-9963","tags":["advisory"]},{"url":"https://ubuntu.com/security/CVE-2016-9963","tags":["report"]},{"url":"http://www.openwall.com/lists/oss-security/2016/12/16/1","tags":["report"]},{"url":"https://www.exim.org/static/doc/CVE-2016-9963.txt","tags":["report"]},{"url":"https://ubuntu.com/security/notices/USN-3164-1","tags":["advisory"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2016-9963","tags":["report"]},{"url":"","tags":["advisory"]},{"url":"https://www.suse.com/security/cve/CVE-2016-9963","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2017-1000369","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2017-16943","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2017-16944","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2018-6789","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2019-10149","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2019-13917","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2019-15846","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2019-16928","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2020-12783","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2020-28007","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2020-28008","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2020-28009","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2020-28010","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2020-28011","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2020-28012","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2020-28013","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2020-28014","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2020-28015","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2020-28016","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2020-28017","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2020-28018","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2020-28019","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2020-28020","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2020-28021","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2020-28022","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2020-28023","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2020-28024","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2020-28025","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2020-28026","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2020-8015","tags":["web"]}],"sources":{"cve":[{"id":"CVE-2016-9963","description":"Exim before 4.87.1 might allow remote attackers to obtain the private DKIM signing key via vectors related to log files and bounce messages.","status":"published","published":"2017-02-01T15:00:00Z","modified":"2024-08-06T03:07:31.347Z","updated_at":"2026-11-02T14:33:31.764001Z"}],"euvd":[{"id":"EUVD-2016-10748","description":"Exim before 4.87.1 might allow remote attackers to obtain the private DKIM signing key via vectors related to log files and bounce messages.","status":"published","published":"2017-02-01T15:00:00Z","modified":"2024-08-06T03:07:31Z","updated_at":"2026-11-03T02:22:25.833438Z"}],"ghsa":[{"id":"GHSA-qf64-f8r5-29m4","title":"Exim before 4.87.1 might allow remote attackers to obtain the private DKIM signing key via...","description":"Exim before 4.87.1 might allow remote attackers to obtain the private DKIM signing key via vectors related to log files and bounce 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