{"id":"CVE-2021-44647","aliases":["AZL-41327","AZL-41797","AZL-9317","BELL-CVE-2021-44647","BIT-lua-2021-44647","DEBIAN-CVE-2021-44647","EUVD-2021-31468","GHSA-wvx9-9phh-9j3h","JLSEC-2026-557","OESA-2022-1632","UBUNTU-CVE-2021-44647","openSUSE-SU-2024:12156-1","openSUSE-SU-2025:15401-1"],"status":"published","title":"Lua 5.4.4 and 5.4.2 are affected by SEGV by type confusion in funcnamefromcode function in ldebug...","description":"Lua v5.4.3 and above are affected by SEGV by type confusion in funcnamefromcode function in ldebug.c which can cause a local denial of service.","severity":{"version":"3.1","score":5.5,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","level":"medium","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-12","score":0.0045,"percentile":0.39596,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-843"],"published":"2022-01-11T00:00:00Z","modified":"2026-11-05T05:40:51Z","fixes":[{"ecosystem":"Azure Linux:3","package":"memcached","fixed_in":["1.6.27-3"],"sources":["osv"]},{"ecosystem":"Azure Linux:3","package":"ntopng","fixed_in":["5.2.1-5"],"sources":["osv"]},{"ecosystem":"Azure Linux:2","package":"lua","fixed_in":["5.4.3-3"],"sources":["osv"]},{"ecosystem":"Bitnami","package":"lua","fixed_in":["5.4.4"],"sources":["osv"]},{"ecosystem":"Debian:12","package":"lua5.4","fixed_in":["5.4.4-1"],"sources":["osv"]},{"ecosystem":"Debian:13","package":"lua5.4","fixed_in":["5.4.4-1"],"sources":["osv"]},{"ecosystem":"Debian:14","package":"lua5.4","fixed_in":["5.4.4-1"],"sources":["osv"]},{"ecosystem":"Julia","package":"Lua_jll","fixed_in":["5.4.4+0"],"sources":["osv"]}],"affected":[{"source":"osv","ecosystem":"Azure Linux:3","package":"memcached","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.6.27-3"}]}]},{"source":"osv","ecosystem":"Azure Linux:3","package":"ntopng","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"5.2.1-5"}]}]},{"source":"osv","ecosystem":"Azure Linux:2","package":"lua","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"5.4.3-3"}]}]},{"source":"osv","ecosystem":"Bitnami","package":"lua","ranges":[{"type":"SEMVER","events":[{"introduced":"5.4.3"},{"fixed":"5.4.4"}]}]},{"source":"osv","ecosystem":"Debian:12","package":"lua5.4","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"5.4.4-1"}]}]},{"source":"osv","ecosystem":"Debian:13","package":"lua5.4","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"5.4.4-1"}]}]},{"source":"osv","ecosystem":"Debian:14","package":"lua5.4","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"5.4.4-1"}]}]},{"source":"osv","ecosystem":"Julia","package":"Lua_jll","ranges":[{"type":"SEMVER","events":[{"introduced":"5.4.3+0"},{"fixed":"5.4.4+0"}]}]},{"source":"osv","ecosystem":"openEuler:22.03-LTS","package":"lua","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"5.4.3-6.oe2203"}]}],"bundled":2},{"source":"osv","ecosystem":"openSUSE:Tumbleweed","package":"lua55","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"5.5.0~beta1-1.1"}]}],"bundled":9}],"products":[{"vendor":"fedoraproject","product":"fedora"},{"vendor":"lua","product":"lua"}],"references":[{"url":"http://lua-users.org/lists/lua-l/2021-11/msg00195.html","tags":["x_transferred","Exploit","Mailing List","Vendor Advisory","advisory","evidence","web","report"]},{"url":"http://lua-users.org/lists/lua-l/2021-11/msg00204.html","tags":["x_transferred","Mailing List","Patch","Vendor Advisory","advisory","fix","web","report"]},{"url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/P3EMGAQ5Y6GXJLY4K5DUOOEQT4MZ4J4F/","tags":["vendor-advisory","x_transferred","web"]},{"url":"https://access.redhat.com/security/cve/cve-2021-44647","tags":["x_transferred","Third Party Advisory","advisory","web"]},{"url":"https://security.gentoo.org/glsa/202305-23","tags":["vendor-advisory","x_transferred","web","advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-44647","tags":["web","advisory"]},{"url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/P3EMGAQ5Y6GXJLY4K5DUOOEQT4MZ4J4F/"},{"url":"https://github.com/advisories/GHSA-wvx9-9phh-9j3h"},{"url":"https://docs.bell-sw.com/security/cves/CVE-2021-44647","tags":["advisory"]},{"url":"https://security-tracker.debian.org/tracker/CVE-2021-44647","tags":["advisory"]},{"url":"https://www.openeuler.org/en/security/safety-bulletin/detail.html?id=openEuler-SA-2022-1632","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2022-28805","tags":["advisory"]},{"url":"https://ubuntu.com/security/CVE-2021-44647","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2021-44647","tags":["report"]},{"url":"","tags":["advisory"]},{"url":"https://www.suse.com/security/cve/CVE-2021-43519","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2021-44647","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2020-15888","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2020-15945","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2020-24342","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2020-24369","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2020-24370","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2020-24371","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2022-33099","tags":["web"]}],"sources":{"cve":[{"id":"CVE-2021-44647","description":"Lua v5.4.3 and above are affected by SEGV by type confusion in funcnamefromcode function in ldebug.c which can cause a local denial of service.","status":"published","published":"2022-01-11T00:00:00Z","modified":"2024-08-04T04:25:16.894Z","updated_at":"2026-11-02T14:33:01.495293Z"}],"euvd":[{"id":"EUVD-2021-31468","description":"Lua v5.4.3 and above are affected by SEGV by type confusion in funcnamefromcode function in ldebug.c which can cause a local denial of service.","status":"published","published":"2022-01-11T00:00:00Z","modified":"2024-08-04T04:25:16Z","updated_at":"2026-11-03T03:08:28.560815Z"}],"ghsa":[{"id":"GHSA-wvx9-9phh-9j3h","title":"Lua 5.4.4 and 5.4.2 are affected by SEGV by type confusion in funcnamefromcode function in ldebug...","description":"Lua 5.4.4 and 5.4.2 are affected by SEGV by type confusion in funcnamefromcode function in ldebug.c which can cause a local denial of service.","status":"published","published":"2022-01-12T00:01:22Z","modified":"2023-05-12T05:00:18Z","cvss":[{"version":"3.1","score":5.5,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","level":"medium"}],"cwes":["CWE-843"],"updated_at":"2026-11-02T14:54:35.04449Z"}],"nvd":[{"id":"CVE-2021-44647","description":"Lua v5.4.3 and above are affected by SEGV by type confusion in funcnamefromcode function in ldebug.c which can cause a local denial of service.","status":"published","published":"2022-01-11T13:15:07.833Z","modified":"2026-06-17T04:12:38.127Z","cvss":[{"version":"3.1","score":5.5,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","level":"medium","assessor":"primary"},{"version":"2.0","score":2.1,"vector":"AV:L/AC:L/Au:N/C:N/I:N/A:P","level":"low","assessor":"primary"}],"cwes":["CWE-843"],"updated_at":"2026-11-02T14:07:03.418194Z"}],"osv":[{"id":"AZL-41327","title":"CVE-2021-44647 affecting package memcached for versions less than 1.6.27-3","description":"Lua v5.4.3 and above are affected by SEGV by type confusion in funcnamefromcode function in ldebug.c which can cause a local denial of service.","status":"published","published":"2022-01-11T13:15:07Z","modified":"2026-11-05T05:40:51Z","cvss":[{"version":"3.1","score":5.5,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","level":"medium"}],"updated_at":"2026-11-05T16:41:19.893001Z"},{"id":"AZL-41797","title":"CVE-2021-44647 affecting package ntopng for versions less than 5.2.1-5","description":"Lua v5.4.3 and above are affected by SEGV by type confusion in funcnamefromcode function in ldebug.c which can cause a local denial of service.","status":"published","published":"2022-01-11T13:15:07Z","modified":"2026-11-05T05:40:51Z","cvss":[{"version":"3.1","score":5.5,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","level":"medium"}],"updated_at":"2026-11-05T16:41:19.893001Z"},{"id":"AZL-9317","title":"CVE-2021-44647 affecting package lua for versions less than 5.4.3-3","description":"Lua v5.4.3 and above are affected by SEGV by type confusion in funcnamefromcode function in ldebug.c which can cause a local denial of service.","status":"published","published":"2022-01-11T13:15:07Z","modified":"2026-04-21T04:35:00.613398Z","cvss":[{"version":"3.1","score":5.5,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","level":"medium"}],"updated_at":"2026-11-02T15:28:11.723718Z"},{"id":"BELL-CVE-2021-44647","title":"CVE-2021-44647 does not affect BellSoft software","status":"withdrawn","published":"2022-01-11T13:15:00Z","modified":"2026-01-26T10:04:54.852469Z","cvss":[{"version":"3.1","score":5.5,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","level":"medium"}],"updated_at":"2026-11-02T15:28:16.5265Z"},{"id":"CVE-2021-44647","description":"Lua v5.4.3 and above are affected by SEGV by type confusion in funcnamefromcode function in ldebug.c which can cause a local denial of service.","status":"published","published":"2022-01-11T13:15:07.833Z","modified":"2026-10-24T10:30:56.695216277Z","cvss":[{"version":"3.1","score":5.5,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","level":"medium"}],"updated_at":"2026-11-02T15:44:21.877444Z"},{"id":"DEBIAN-CVE-2021-44647","description":"Lua v5.4.3 and above are affected by SEGV by type confusion in funcnamefromcode function in ldebug.c which can cause a local denial of service.","status":"published","published":"2022-01-11T13:15:07.833Z","modified":"2026-10-23T18:04:17.080300428Z","cvss":[{"version":"3.1","score":5.5,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","level":"medium"}],"updated_at":"2026-11-02T15:45:35.799676Z"},{"id":"JLSEC-2026-557","description":"Lua v5.4.3 and above are affected by SEGV by type confusion in funcnamefromcode function in ldebug.c which can cause a local denial of service.","status":"published","published":"2026-05-26T19:45:06.761Z","modified":"2026-07-18T00:02:10.824963362Z","cvss":[{"version":"2.0","score":2.1,"vector":"AV:L/AC:L/Au:N/C:N/I:N/A:P","level":"low"},{"version":"3.1","score":5.5,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","level":"medium"}],"updated_at":"2026-11-02T15:47:18.573531Z"},{"id":"OESA-2022-1632","title":"lua security update","description":"Lua is a powerful, efficient, lightweight, embeddable scripting language. 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