{"id":"CVE-2018-12550","aliases":["ALPINE-CVE-2018-12550","BELL-CVE-2018-12550","DEBIAN-CVE-2018-12550","DLA-1972-1","DSA-4388-1","EUVD-2018-4510","GHSA-5cgw-j2m3-gxhw","UBUNTU-CVE-2018-12550","openSUSE-SU-2019:0233-1","openSUSE-SU-2019:0237-1","openSUSE-SU-2024:11057-1"],"status":"published","title":"When Eclipse Mosquitto version 1.0 to 1.5.5 (inclusive) is configured to use an ACL file, and...","description":"When Eclipse Mosquitto version 1.0 to 1.5.5 (inclusive) is configured to use an ACL file, and that ACL file is empty, or contains only comments or blank lines, then Mosquitto will treat this as though no ACL file has been defined and use a default allow policy. The new behaviour is to have an empty ACL file mean that all access is denied, which is not a useful configuration but is not unexpected.","severity":{"version":"3.0","score":8.1,"vector":"CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"high","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-08","score":0.01353,"percentile":0.71764,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-440"],"published":"2019-02-10T00:00:00Z","modified":"2026-10-24T10:30:48Z","fixes":[{"ecosystem":"Alpine:v3.10","package":"mosquitto","fixed_in":["1.5.6-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.11","package":"mosquitto","fixed_in":["1.5.6-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.12","package":"mosquitto","fixed_in":["1.5.6-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.13","package":"mosquitto","fixed_in":["1.5.6-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.14","package":"mosquitto","fixed_in":["1.5.6-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.15","package":"mosquitto","fixed_in":["1.5.6-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.16","package":"mosquitto","fixed_in":["1.5.6-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.17","package":"mosquitto","fixed_in":["1.5.6-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.18","package":"mosquitto","fixed_in":["1.5.6-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.19","package":"mosquitto","fixed_in":["1.5.6-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.20","package":"mosquitto","fixed_in":["1.5.6-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.21","package":"mosquitto","fixed_in":["1.5.6-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.22","package":"mosquitto","fixed_in":["1.5.6-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.23","package":"mosquitto","fixed_in":["1.5.6-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.24","package":"mosquitto","fixed_in":["1.5.6-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.7","package":"mosquitto","fixed_in":["1.4.15-r1"],"sources":["osv"]},{"ecosystem":"Alpine:v3.8","package":"mosquitto","fixed_in":["1.4.15-r4"],"sources":["osv"]},{"ecosystem":"Alpine:v3.9","package":"mosquitto","fixed_in":["1.5.6-r0"],"sources":["osv"]},{"ecosystem":"Debian:12","package":"mosquitto","fixed_in":["1.5.6-1"],"sources":["osv"]},{"ecosystem":"Debian:13","package":"mosquitto","fixed_in":["1.5.6-1"],"sources":["osv"]},{"ecosystem":"Debian:14","package":"mosquitto","fixed_in":["1.5.6-1"],"sources":["osv"]},{"ecosystem":"Ubuntu:16.04:LTS","package":"mosquitto","fixed_in":["1.4.8-1ubuntu0.16.04.5"],"sources":["osv"]},{"ecosystem":"Ubuntu:18.04:LTS","package":"mosquitto","fixed_in":["1.4.15-2ubuntu0.18.04.1"],"sources":["osv"]}],"affected":[{"source":"osv","ecosystem":"Alpine:v3.10","package":"mosquitto","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"1.0"},{"fixed":"1.5.6-r0"}]}]},{"source":"osv","ecosystem":"Alpine:v3.11","package":"mosquitto","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"1.0"},{"fixed":"1.5.6-r0"}]}]},{"source":"osv","ecosystem":"Alpine:v3.12","package":"mosquitto","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"1.0"},{"fixed":"1.5.6-r0"}]}]},{"source":"osv","ecosystem":"Alpine:v3.13","package":"mosquitto","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"1.0"},{"fixed":"1.5.6-r0"}]}]},{"source":"osv","ecosystem":"Alpine:v3.14","package":"mosquitto","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"1.0"},{"fixed":"1.5.6-r0"}]}]},{"source":"osv","ecosystem":"Alpine:v3.15","package":"mosquitto","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"1.0"},{"fixed":"1.5.6-r0"}]}]},{"source":"osv","ecosystem":"Alpine:v3.16","package":"mosquitto","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"1.0"},{"fixed":"1.5.6-r0"}]}]},{"source":"osv","ecosystem":"Alpine:v3.17","package":"mosquitto","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"1.0"},{"fixed":"1.5.6-r0"}]}]},{"source":"osv","ecosystem":"Alpine:v3.18","package":"mosquitto","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"1.0"},{"fixed":"1.5.6-r0"}]}]},{"source":"osv","ecosystem":"Alpine:v3.19","package":"mosquitto","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"1.0"},{"fixed":"1.5.6-r0"}]}]},{"source":"osv","ecosystem":"Alpine:v3.20","package":"mosquitto","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"1.0"},{"fixed":"1.5.6-r0"}]}]},{"source":"osv","ecosystem":"Alpine:v3.21","package":"mosquitto","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"1.0"},{"fixed":"1.5.6-r0"}]}]},{"source":"osv","ecosystem":"Alpine:v3.22","package":"mosquitto","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"1.0"},{"fixed":"1.5.6-r0"}]}]},{"source":"osv","ecosystem":"Alpine:v3.23","package":"mosquitto","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"1.0"},{"fixed":"1.5.6-r0"}]}]},{"source":"osv","ecosystem":"Alpine:v3.24","package":"mosquitto","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"1.0"},{"fixed":"1.5.6-r0"}]}]},{"source":"osv","ecosystem":"Alpine:v3.7","package":"mosquitto","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"1.0"},{"fixed":"1.4.15-r1"}]}]},{"source":"osv","ecosystem":"Alpine:v3.8","package":"mosquitto","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"1.0"},{"fixed":"1.4.15-r4"}]}]},{"source":"osv","ecosystem":"Alpine:v3.9","package":"mosquitto","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"1.0"},{"fixed":"1.5.6-r0"}]}]},{"source":"osv","ecosystem":"Debian:12","package":"mosquitto","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.5.6-1"}]}]},{"source":"osv","ecosystem":"Debian:13","package":"mosquitto","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.5.6-1"}]}]},{"source":"osv","ecosystem":"Debian:14","package":"mosquitto","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.5.6-1"}]}]},{"source":"osv","ecosystem":"Debian:8","package":"mosquitto","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.3.4-2+deb8u4"}]}],"versions":["1.3.4-2","1.3.4-2+deb8u1","1.3.4-2+deb8u2","1.3.4-2+deb8u3"],"bundled":4},{"source":"osv","ecosystem":"Debian:9","package":"mosquitto","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.4.10-3+deb9u3"}]}],"versions":["1.4.10-3","1.4.10-3+deb9u1","1.4.10-3+deb9u2"],"bundled":3},{"source":"osv","ecosystem":"Ubuntu:Pro:14.04:LTS","package":"mosquitto","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.15-2ubuntu1","0.15-2ubuntu1.1","0.15-2ubuntu1.2","0.15-2+deb7u3ubuntu0.1","0.15-2+deb7u3ubuntu0.1+esm1"]},{"source":"osv","ecosystem":"Ubuntu:16.04:LTS","package":"mosquitto","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.4.8-1ubuntu0.16.04.5"}]}],"versions":["1.4.3-1","1.4.4-1","1.4.7-1","1.4.8-1","1.4.8-1build1","1.4.8-1ubuntu0.16.04.1","1.4.8-1ubuntu0.16.04.2","1.4.8-1ubuntu0.16.04.3","1.4.8-1ubuntu0.16.04.4"]},{"source":"osv","ecosystem":"Ubuntu:18.04:LTS","package":"mosquitto","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.4.15-2ubuntu0.18.04.1"}]}],"versions":["1.4.12-1","1.4.14-1","1.4.14-2","1.4.14-2build1","1.4.15-1","1.4.15-2"]},{"source":"osv","ecosystem":"SUSE:Package Hub 15","package":"mosquitto","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.4.15-bp150.3.3.1"}]}],"bundled":3}],"products":[{"vendor":"eclipse","product":"mosquitto"},{"vendor":"the eclipse foundation","product":"eclipse mosquitto"}],"references":[{"url":"https://bugs.eclipse.org/bugs/show_bug.cgi?id=541870","tags":["x_refsource_CONFIRM","x_transferred","Issue Tracking","Vendor Advisory","report"]},{"url":"https://lists.debian.org/debian-lts-announce/2019/10/msg00035.html","tags":["mailing-list","x_refsource_MLIST","x_transferred","web"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2018-12550"},{"url":"https://github.com/advisories/GHSA-5cgw-j2m3-gxhw"},{"url":"https://security.alpinelinux.org/vuln/CVE-2018-12550","tags":["advisory"]},{"url":"https://docs.bell-sw.com/security/cves/CVE-2018-12550","tags":["advisory"]},{"url":"https://security-tracker.debian.org/tracker/CVE-2018-12550","tags":["advisory"]},{"url":"https://ubuntu.com/security/CVE-2018-12550","tags":["report"]},{"url":"https://mosquitto.org/blog/2019/02/version-1-5-6-released/","tags":["report"]},{"url":"https://mosquitto.org/files/cve/2018-12550","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2018-12550","tags":["report"]},{"url":"https://lists.opensuse.org/archives/list/security-announce@lists.opensuse.org/thread/SRF6WPNSL7W2K6AHOK3GYIPB4F2ISYFN/#SRF6WPNSL7W2K6AHOK3GYIPB4F2ISYFN","tags":["advisory"]},{"url":"https://bugzilla.suse.com/1125019","tags":["report"]},{"url":"https://bugzilla.suse.com/1125020","tags":["report"]},{"url":"https://bugzilla.suse.com/1125021","tags":["report"]},{"url":"https://www.suse.com/security/cve/CVE-2018-12546","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2018-12550","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2018-12551","tags":["web"]},{"url":"https://lists.opensuse.org/archives/list/security-announce@lists.opensuse.org/thread/YSX4D64TRLDVQNQZHRPNZIOVDOBKHJEA/#YSX4D64TRLDVQNQZHRPNZIOVDOBKHJEA","tags":["advisory"]},{"url":"","tags":["advisory"]},{"url":"https://www.suse.com/security/cve/CVE-2017-7650","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2017-7651","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2017-7652","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2017-9868","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2018-12543","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2018-20145","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2019-11778","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2019-11779","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2021-28166","tags":["web"]}],"sources":{"cve":[{"id":"CVE-2018-12550","description":"When Eclipse Mosquitto version 1.0 to 1.5.5 (inclusive) is configured to use an ACL file, and that ACL file is empty, or contains only comments or blank lines, then Mosquitto will treat this as though no ACL file has been defined and use a default allow policy. The new behaviour is to have an empty ACL file mean that all access is denied, which is not a useful configuration but is not unexpected.","status":"published","published":"2019-03-27T17:26:20Z","modified":"2024-08-05T08:38:06.29Z","cwes":["CWE-440"],"updated_at":"2026-11-02T14:35:06.679212Z"}],"euvd":[{"id":"EUVD-2018-4510","description":"When Eclipse Mosquitto version 1.0 to 1.5.5 (inclusive) is configured to use an ACL file, and that ACL file is empty, or contains only comments or blank lines, then Mosquitto will treat this as though no ACL file has been defined and use a default allow policy. The new behaviour is to have an empty ACL file mean that all access is denied, which is not a useful configuration but is not unexpected.","status":"published","published":"2019-03-27T17:26:20Z","modified":"2024-08-05T08:38:06Z","updated_at":"2026-11-03T02:39:52.61924Z"}],"ghsa":[{"id":"GHSA-5cgw-j2m3-gxhw","title":"When Eclipse Mosquitto version 1.0 to 1.5.5 (inclusive) is configured to use an ACL file, and...","description":"When Eclipse Mosquitto version 1.0 to 1.5.5 (inclusive) is configured to use an ACL file, and that ACL file is empty, or contains only comments or blank lines, then Mosquitto will treat this as though no ACL file has been defined and use a default allow policy. The new behaviour is to have an empty ACL file mean that all access is denied, which is not a useful configuration but is not unexpected.","status":"published","published":"2022-05-13T01:34:45Z","modified":"2023-02-01T05:08:31Z","cvss":[{"version":"3.0","score":8.1,"vector":"CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"high"}],"updated_at":"2026-11-02T14:50:47.326034Z"}],"nvd":[{"id":"CVE-2018-12550","description":"When Eclipse Mosquitto version 1.0 to 1.5.5 (inclusive) is configured to use an ACL file, and that ACL file is empty, or contains only comments or blank lines, then Mosquitto will treat this as though no ACL file has been defined and use a default allow policy. The new behaviour is to have an empty ACL file mean that all access is denied, which is not a useful configuration but is not unexpected.","status":"published","published":"2019-03-27T18:29:00.303Z","modified":"2026-06-17T01:37:57.7Z","cvss":[{"version":"3.0","score":8.1,"vector":"CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"high","assessor":"primary"},{"version":"2.0","score":6.8,"vector":"AV:N/AC:M/Au:N/C:P/I:P/A:P","level":"medium","assessor":"primary"}],"cwes":["CWE-440"],"updated_at":"2026-11-02T14:04:55.136632Z"}],"osv":[{"id":"ALPINE-CVE-2018-12550","description":"When Eclipse Mosquitto version 1.0 to 1.5.5 (inclusive) is configured to use an ACL file, and that ACL file is empty, or contains only comments or blank lines, then Mosquitto will treat this as though no ACL file has been defined and use a default allow policy. The new behaviour is to have an empty ACL file mean that all access is denied, which is not a useful configuration but is not unexpected.","status":"published","published":"2019-03-27T18:29:00.303Z","modified":"2026-10-23T17:17:55.209256579Z","cvss":[{"version":"3.0","score":8.1,"vector":"CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"high"}],"updated_at":"2026-11-02T15:27:47.187336Z"},{"id":"BELL-CVE-2018-12550","title":"CVE-2018-12550 does not affect BellSoft software","status":"withdrawn","published":"2023-08-31T12:13:55.834271Z","modified":"2026-01-26T09:46:48.813605Z","cvss":[{"version":"3.0","score":8.1,"vector":"CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"high"}],"updated_at":"2026-11-02T15:28:14.701973Z"},{"id":"CVE-2018-12550","description":"When Eclipse Mosquitto version 1.0 to 1.5.5 (inclusive) is configured to use an ACL file, and that ACL file is empty, or contains only comments or blank lines, then Mosquitto will treat this as though no ACL file has been defined and use a default allow policy. The new behaviour is to have an empty ACL file mean that all access is denied, which is not a useful configuration but is not unexpected.","status":"published","published":"2019-03-27T18:29:00.303Z","modified":"2026-10-24T10:30:48.130078897Z","cvss":[{"version":"3.0","score":8.1,"vector":"CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"high"}],"updated_at":"2026-11-02T15:44:07.934182Z"},{"id":"DEBIAN-CVE-2018-12550","description":"When Eclipse Mosquitto version 1.0 to 1.5.5 (inclusive) is configured to use an ACL file, and that ACL file is empty, or contains only comments or blank lines, then Mosquitto will treat this as though no ACL file has been defined and use a default allow policy. The new behaviour is to have an empty ACL file mean that all access is denied, which is not a useful configuration but is not unexpected.","status":"published","published":"2019-03-27T18:29:00.303Z","modified":"2026-10-23T18:03:36.428360808Z","cvss":[{"version":"3.0","score":8.1,"vector":"CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"high"}],"updated_at":"2026-11-02T15:45:30.290351Z"},{"id":"UBUNTU-CVE-2018-12550","description":"When Eclipse Mosquitto version 1.0 to 1.5.5 (inclusive) is configured to use an ACL file, and that ACL file is empty, or contains only comments or blank lines, then Mosquitto will treat this as though no ACL file has been defined and use a default allow policy. The new behaviour is to have an empty ACL file mean that all access is denied, which is not a useful configuration but is not unexpected.","status":"published","published":"2019-03-27T18:29:00Z","modified":"2026-04-22T11:44:13.076412Z","cvss":[{"version":"3.0","score":8.1,"vector":"CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"high"}],"updated_at":"2026-11-02T15:54:17.014176Z"},{"id":"DLA-1972-1","title":"mosquitto - security update","status":"published","published":"2019-10-26T00:00:00Z","modified":"2026-03-09T01:20:27.623062Z","updated_at":"2026-11-02T15:46:10.227108Z"},{"id":"DSA-4388-1","title":"mosquitto - security update","status":"published","published":"2019-02-10T00:00:00Z","modified":"2026-03-09T02:10:07.740572Z","updated_at":"2026-11-02T15:46:16.862196Z"},{"id":"openSUSE-SU-2019:0233-1","title":"Security update for mosquitto","description":"This update for mosquitto fixes the following issues:\n\nSecurity issues fixed: \n\n- CVE-2018-12546: Fixed an issue with revoked access to topics (bsc#1125019).\n- CVE-2018-12551: Fixed an issue which allowed malformed data in the password file to be treated as valid (bsc#1125020).\n- CVE-2018-12550: Fixed an an issue which treats an empty ACL file  wrongly (bsc#1125021).\n","status":"published","published":"2019-03-23T11:06:23Z","modified":"2026-02-04T03:16:32.85422Z","updated_at":"2026-11-02T16:58:30.39372Z"},{"id":"openSUSE-SU-2019:0237-1","title":"Security update for mosquitto","description":"This update for mosquitto fixes the following issues:\n\nSecurity issues fixed: \n\n- CVE-2018-12546: Fixed an issue with revoked access to topics (bsc#1125019).\n- CVE-2018-12551: Fixed an issue which allowed malformed data in the password file to be treated as valid (bsc#1125020).\n- CVE-2018-12550: Fixed an an issue which treats an empty ACL file  wrongly (bsc#1125021).\n\nThis update was imported from the openSUSE:Leap:15.0:Update update project.","status":"published","published":"2019-02-23T08:03:59Z","modified":"2026-02-04T04:05:12.029622Z","updated_at":"2026-11-02T16:58:30.39372Z"},{"id":"openSUSE-SU-2024:11057-1","title":"libmosquitto1-2.0.11-1.2 on GA media","description":"These are all security issues fixed in the libmosquitto1-2.0.11-1.2 package on the GA media of openSUSE Tumbleweed.","status":"published","published":"2024-06-15T00:00:00Z","modified":"2026-02-04T02:24:30.951191Z","updated_at":"2026-11-02T16:58:34.894275Z"}]}}