{"id":"CVE-2021-45256","aliases":["DEBIAN-CVE-2021-45256","EUVD-2021-32036","GHSA-vc9p-94q9-qg8c","UBUNTU-CVE-2021-45256"],"status":"published","title":"A Null Pointer Dereference vulnerability existfs in nasm 2.16rc0 via asm/preproc.c.","description":"A Null Pointer Dereference vulnerability existfs in nasm 2.16rc0 via asm/preproc.c.","severity":{"version":"3.1","score":5.5,"vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H","level":"medium","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-09","score":0.0069,"percentile":0.53075,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-476"],"published":"2021-12-22T16:30:59Z","modified":"2026-10-23T18:04:50Z","affected":[{"source":"osv","ecosystem":"Debian:12","package":"nasm","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.16.01-1","2.16.03-1","3.01-1"]},{"source":"osv","ecosystem":"Debian:13","package":"nasm","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.16.03-1","3.01-1"]},{"source":"osv","ecosystem":"Debian:14","package":"nasm","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.16.03-1","3.01-1"]},{"source":"osv","ecosystem":"Ubuntu:16.04:LTS","package":"nasm","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.11.06-1really2.11.05-1","2.11.08-1","2.11.08-1ubuntu0.1"]},{"source":"osv","ecosystem":"Ubuntu:18.04:LTS","package":"nasm","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.13.01-2","2.13.02-0.1"]},{"source":"osv","ecosystem":"Ubuntu:20.04:LTS","package":"nasm","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.14.02-1"]},{"source":"osv","ecosystem":"Ubuntu:Pro:22.04:LTS","package":"nasm","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.15.05-1","2.15.05-1ubuntu0.1~esm1","2.15.05-1ubuntu0.1~esm2"]},{"source":"osv","ecosystem":"Ubuntu:Pro:24.04:LTS","package":"nasm","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.16.01-1","2.16.01-1build1","2.16.01-1ubuntu0.1~esm1","2.16.01-1ubuntu0.1~esm2"]},{"source":"osv","ecosystem":"Ubuntu:25.10","package":"nasm","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.16.03-1"]},{"source":"osv","ecosystem":"Ubuntu:26.10","package":"nasm","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["3.01-1"]},{"source":"osv","ecosystem":"Ubuntu:26.04:LTS","package":"nasm","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.16.03-1","3.01-1"]}],"products":[{"vendor":"nasm","product":"netwide_assembler"}],"references":[{"url":"https://bugzilla.nasm.us/show_bug.cgi?id=3392789","tags":["x_refsource_MISC","x_transferred","Broken Link","Issue Tracking","report"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-45256"},{"url":"https://github.com/advisories/GHSA-vc9p-94q9-qg8c"},{"url":"https://security-tracker.debian.org/tracker/CVE-2021-45256","tags":["advisory"]},{"url":"https://ubuntu.com/security/CVE-2021-45256","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2021-45256","tags":["report"]}],"sources":{"cve":[{"id":"CVE-2021-45256","description":"A Null Pointer Dereference vulnerability existfs in nasm 2.16rc0 via asm/preproc.c.","status":"published","published":"2021-12-22T16:30:59Z","modified":"2024-08-04T04:39:20.325Z","updated_at":"2026-11-02T14:33:02.580561Z"}],"euvd":[{"id":"EUVD-2021-32036","description":"A Null Pointer Dereference vulnerability existfs in nasm 2.16rc0 via asm/preproc.c.","status":"published","published":"2021-12-22T16:30:59Z","modified":"2024-08-04T04:39:20Z","updated_at":"2026-11-03T03:08:27.448176Z"}],"ghsa":[{"id":"GHSA-vc9p-94q9-qg8c","title":"A Null Pointer Dereference vulnerability existfs in nasm 2.16rc0 via asm/preproc.c.","description":"A Null Pointer Dereference vulnerability existfs in nasm 2.16rc0 via asm/preproc.c.","status":"published","published":"2021-12-23T00:01:30Z","modified":"2023-02-03T05:03:14Z","cwes":["CWE-476"],"updated_at":"2026-11-02T14:53:19.085994Z"}],"nvd":[{"id":"CVE-2021-45256","description":"A Null Pointer Dereference vulnerability existfs in nasm 2.16rc0 via asm/preproc.c.","status":"published","published":"2021-12-22T17:15:09.17Z","modified":"2026-06-17T04:13:13.533Z","cvss":[{"version":"3.1","score":5.5,"vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H","level":"medium","assessor":"primary"},{"version":"2.0","score":4.3,"vector":"AV:N/AC:M/Au:N/C:N/I:N/A:P","level":"medium","assessor":"primary"}],"cwes":["CWE-476"],"updated_at":"2026-11-02T14:07:02.566991Z"}],"osv":[{"id":"CVE-2021-45256","description":"A Null Pointer Dereference vulnerability existfs in nasm 2.16rc0 via asm/preproc.c.","status":"published","published":"2021-12-22T17:15:09.17Z","modified":"2026-03-14T01:39:29.903165Z","cvss":[{"version":"3.1","score":5.5,"vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H","level":"medium"}],"updated_at":"2026-11-02T15:44:21.877444Z"},{"id":"DEBIAN-CVE-2021-45256","description":"A Null Pointer Dereference vulnerability existfs in nasm 2.16rc0 via asm/preproc.c.","status":"published","published":"2021-12-22T17:15:09.17Z","modified":"2026-10-23T18:04:50.839371771Z","cvss":[{"version":"3.1","score":5.5,"vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H","level":"medium"}],"updated_at":"2026-11-02T15:45:35.799676Z"},{"id":"UBUNTU-CVE-2021-45256","description":"A Null Pointer Dereference vulnerability existfs in nasm 2.16rc0 via asm/preproc.c.","status":"published","published":"2021-12-22T17:15:00Z","modified":"2026-10-17T12:55:47.841220429Z","cvss":[{"version":"3.1","score":5.5,"vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H","level":"medium"}],"updated_at":"2026-11-02T15:54:30.277322Z"}]}}
