{"id":"CVE-2021-33455","aliases":["AZL-10325","AZL-35365","DEBIAN-CVE-2021-33455","EUVD-2021-20159","GHSA-g6p9-cjgh-r556","JLSEC-2026-585","UBUNTU-CVE-2021-33455"],"status":"published","title":"An issue was discovered in yasm version 1.3.0. There is a NULL pointer dereference in...","description":"An issue was discovered in yasm version 1.3.0. There is a NULL pointer dereference in do_directive() in modules/preprocs/nasm/nasm-pp.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":"2026-11-10","score":0.00325,"percentile":0.25758,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-476"],"published":"2022-07-26T12:36:34Z","modified":"2026-11-05T05:40:51Z","affected":[{"source":"osv","ecosystem":"Azure Linux:2","package":"yasm","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"last_affected":"1.3.0-17"}]}]},{"source":"osv","ecosystem":"Azure Linux:3","package":"yasm","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"last_affected":"1.3.0-17"}]}]},{"source":"osv","ecosystem":"Debian:12","package":"yasm","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.3.0-4","1.3.0-5","1.3.0-6","1.3.0-7","1.3.0-8"]},{"source":"osv","ecosystem":"Debian:13","package":"yasm","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.3.0-7","1.3.0-8"]},{"source":"osv","ecosystem":"Debian:14","package":"yasm","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.3.0-7","1.3.0-8"]},{"source":"osv","ecosystem":"Julia","package":"YASM_jll","ranges":[{"type":"SEMVER","events":[{"introduced":"0"}]}]},{"source":"osv","ecosystem":"Ubuntu:16.04:LTS","package":"yasm","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.3.0-2"]},{"source":"osv","ecosystem":"Ubuntu:18.04:LTS","package":"yasm","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.3.0-2","1.3.0-2build1"]},{"source":"osv","ecosystem":"Ubuntu:20.04:LTS","package":"yasm","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.3.0-2build1","1.3.0-2ubuntu1"]},{"source":"osv","ecosystem":"Ubuntu:22.04:LTS","package":"yasm","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.3.0-2.1"]},{"source":"osv","ecosystem":"Ubuntu:24.04:LTS","package":"yasm","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.3.0-4"]},{"source":"osv","ecosystem":"Ubuntu:25.10","package":"yasm","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.3.0-5","1.3.0-7"]},{"source":"osv","ecosystem":"Ubuntu:26.10","package":"yasm","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.3.0-8"]},{"source":"osv","ecosystem":"Ubuntu:26.04:LTS","package":"yasm","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.3.0-7","1.3.0-8"]}],"products":[{"vendor":"tortall","product":"yasm"}],"references":[{"url":"https://github.com/yasm/yasm/issues/169","tags":["x_refsource_MISC","x_transferred","Exploit","Issue Tracking","Third Party Advisory","report","web"]},{"url":"https://gist.github.com/Clingto/bb632c0c463f4b2c97e4f65f751c5e6d","tags":["x_refsource_MISC","x_transferred","Third Party Advisory","advisory","web","report"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-33455","tags":["web"]},{"url":"https://github.com/advisories/GHSA-g6p9-cjgh-r556"},{"url":"https://security-tracker.debian.org/tracker/CVE-2021-33455","tags":["advisory"]},{"url":"https://ubuntu.com/security/CVE-2021-33455","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2021-33455","tags":["report"]}],"sources":{"cve":[{"id":"CVE-2021-33455","description":"An issue was discovered in yasm version 1.3.0. There is a NULL pointer dereference in do_directive() in modules/preprocs/nasm/nasm-pp.c.","status":"published","published":"2022-07-26T12:36:34Z","modified":"2024-08-03T23:50:42.988Z","updated_at":"2026-11-02T14:33:10.204494Z"}],"euvd":[{"id":"EUVD-2021-20159","description":"An issue was discovered in yasm version 1.3.0. There is a NULL pointer dereference in do_directive() in modules/preprocs/nasm/nasm-pp.c.","status":"published","published":"2022-07-26T12:36:34Z","modified":"2024-08-03T23:50:42Z","updated_at":"2026-11-03T03:24:34.304953Z"}],"ghsa":[{"id":"GHSA-g6p9-cjgh-r556","title":"An issue was discovered in yasm version 1.3.0. There is a NULL pointer dereference in...","description":"An issue was discovered in yasm version 1.3.0. There is a NULL pointer dereference in do_directive() in modules/preprocs/nasm/nasm-pp.c.","status":"published","published":"2022-07-27T00:00:46Z","modified":"2023-01-27T05:06:39Z","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"}],"cwes":["CWE-476"],"updated_at":"2026-11-02T14:42:57.782632Z"}],"nvd":[{"id":"CVE-2021-33455","description":"An issue was discovered in yasm version 1.3.0. There is a NULL pointer dereference in do_directive() in modules/preprocs/nasm/nasm-pp.c.","status":"published","published":"2022-07-26T13:15:09.337Z","modified":"2026-06-17T03:54:34.963Z","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"}],"cwes":["CWE-476"],"updated_at":"2026-11-02T14:07:06.501652Z"}],"osv":[{"id":"AZL-10325","title":"CVE-2021-33455 affecting package yasm 1.3.0-17","description":"An issue was discovered in yasm version 1.3.0. There is a NULL pointer dereference in do_directive() in modules/preprocs/nasm/nasm-pp.c.","status":"published","published":"2022-07-26T13:15:09Z","modified":"2026-04-21T04:18:55.082299Z","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":"2026-11-02T15:28:00.794214Z"},{"id":"AZL-35365","title":"CVE-2021-33455 affecting package yasm 1.3.0-17","description":"An issue was discovered in yasm version 1.3.0. There is a NULL pointer dereference in do_directive() in modules/preprocs/nasm/nasm-pp.c.","status":"published","published":"2022-07-26T13:15:09Z","modified":"2026-11-05T05:40:51Z","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":"2026-11-05T16:41:19.554273Z"},{"id":"CVE-2021-33455","description":"An issue was discovered in yasm version 1.3.0. There is a NULL pointer dereference in do_directive() in modules/preprocs/nasm/nasm-pp.c.","status":"published","published":"2022-07-26T13:15:09.337Z","modified":"2026-10-20T10:54:43.896127041Z","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":"2026-11-02T15:44:19.793849Z"},{"id":"DEBIAN-CVE-2021-33455","description":"An issue was discovered in yasm version 1.3.0. There is a NULL pointer dereference in do_directive() in modules/preprocs/nasm/nasm-pp.c.","status":"published","published":"2022-07-26T13:15:09.337Z","modified":"2026-10-23T18:03:14.721996533Z","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":"2026-11-02T15:45:35.233346Z"},{"id":"JLSEC-2026-585","description":"An issue was discovered in yasm version 1.3.0. There is a NULL pointer dereference in `do_directive()` in `modules/preprocs/nasm/nasm-pp.c`.","status":"published","published":"2026-06-08T13:43:52.905Z","modified":"2026-07-25T18:24:39.737819093Z","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":"2026-11-02T15:47:18.573531Z"},{"id":"UBUNTU-CVE-2021-33455","description":"An issue was discovered in yasm version 1.3.0. There is a NULL pointer dereference in do_directive() in modules/preprocs/nasm/nasm-pp.c.","status":"published","published":"2022-07-26T13:15:00Z","modified":"2026-10-17T12:56:19.941328115Z","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":"2026-11-02T15:54:27.870979Z"}]}}