{"id":"CVE-2021-45909","aliases":["DEBIAN-CVE-2021-45909","DLA-2937-1","EUVD-2021-32624","GHSA-c9fh-qp5h-24w7","UBUNTU-CVE-2021-45909","USN-5969-1"],"status":"published","title":"An issue was discovered in gif2apng 1.9. There is a heap-based buffer overflow vulnerability in...","description":"An issue was discovered in gif2apng 1.9. There is a heap-based buffer overflow vulnerability in the DecodeLZW function. It allows an attacker to write a large amount of arbitrary data outside the boundaries of a buffer.","severity":{"version":"3.1","score":7.8,"vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","level":"high","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-09","score":0.00896,"percentile":0.59805,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-787"],"published":"2021-12-28T00:02:17Z","modified":"2026-08-27T23:04:43Z","fixes":[{"ecosystem":"Debian:11","package":"gif2apng","fixed_in":["1.9+srconly-3+deb11u1"],"sources":["osv"]},{"ecosystem":"Ubuntu:Pro:16.04:LTS","package":"gif2apng","fixed_in":["1.7-3ubuntu0.1~esm1"],"sources":["osv"]},{"ecosystem":"Ubuntu:18.04:LTS","package":"gif2apng","fixed_in":["1.9+srconly-2ubuntu0.1"],"sources":["osv"]},{"ecosystem":"Ubuntu:20.04:LTS","package":"gif2apng","fixed_in":["1.9+srconly-3ubuntu0.1"],"sources":["osv"]}],"affected":[{"source":"osv","ecosystem":"Debian:11","package":"gif2apng","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.9+srconly-3+deb11u1"}]}],"versions":["1.9+srconly-3"]},{"source":"osv","ecosystem":"Debian:9","package":"gif2apng","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.9+srconly-2+deb9u2"}]}],"versions":["1.9+srconly-2","1.9+srconly-2+deb9u1"],"bundled":3},{"source":"osv","ecosystem":"Ubuntu:Pro:16.04:LTS","package":"gif2apng","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.7-3ubuntu0.1~esm1"}]}],"versions":["1.7-3"]},{"source":"osv","ecosystem":"Ubuntu:18.04:LTS","package":"gif2apng","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.9+srconly-2ubuntu0.1"}]}],"versions":["1.9+srconly-2"]},{"source":"osv","ecosystem":"Ubuntu:20.04:LTS","package":"gif2apng","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.9+srconly-3ubuntu0.1"}]}],"versions":["1.9+srconly-3","1.9+srconly-3build1"]},{"source":"osv","ecosystem":"Ubuntu:Pro:16.04:LTS","package":"gif2apng","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.7-3ubuntu0.1~esm1"}]}],"versions":["1.7-3"],"bundled":3},{"source":"osv","ecosystem":"Ubuntu:18.04:LTS","package":"gif2apng","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.9+srconly-2ubuntu0.1"}]}],"versions":["1.9+srconly-2"],"bundled":3},{"source":"osv","ecosystem":"Ubuntu:20.04:LTS","package":"gif2apng","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.9+srconly-3ubuntu0.1"}]}],"versions":["1.9+srconly-3","1.9+srconly-3build1"],"bundled":3}],"products":[{"vendor":"debian","product":"debian_linux"},{"vendor":"gif2apng_project","product":"gif2apng"}],"references":[{"url":"https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1002668","tags":["x_refsource_MISC","x_transferred","Exploit","Issue Tracking","Mailing List","Third Party Advisory","report"]},{"url":"https://lists.debian.org/debian-lts-announce/2022/03/msg00008.html","tags":["mailing-list","x_refsource_MLIST","x_transferred","Mailing List","Third Party Advisory","advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-45909"},{"url":"https://github.com/advisories/GHSA-c9fh-qp5h-24w7"},{"url":"https://security-tracker.debian.org/tracker/CVE-2021-45909","tags":["advisory"]},{"url":"https://ubuntu.com/security/CVE-2021-45909","tags":["report"]},{"url":"https://ubuntu.com/security/notices/USN-5969-1","tags":["advisory"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2021-45909","tags":["report"]},{"url":"https://ubuntu.com/security/CVE-2021-45910","tags":["report"]},{"url":"https://ubuntu.com/security/CVE-2021-45911","tags":["report"]}],"sources":{"cve":[{"id":"CVE-2021-45909","description":"An issue was discovered in gif2apng 1.9. There is a heap-based buffer overflow vulnerability in the DecodeLZW function. It allows an attacker to write a large amount of arbitrary data outside the boundaries of a buffer.","status":"published","published":"2021-12-28T00:02:17Z","modified":"2024-08-04T04:54:31.019Z","updated_at":"2026-11-02T14:33:02.20241Z"}],"euvd":[{"id":"EUVD-2021-32624","description":"An issue was discovered in gif2apng 1.9. There is a heap-based buffer overflow vulnerability in the DecodeLZW function. It allows an attacker to write a large amount of arbitrary data outside the boundaries of a buffer.","status":"published","published":"2021-12-28T00:02:17Z","modified":"2024-08-04T04:54:31Z","updated_at":"2026-11-03T03:08:25.222984Z"}],"ghsa":[{"id":"GHSA-c9fh-qp5h-24w7","title":"An issue was discovered in gif2apng 1.9. There is a heap-based buffer overflow vulnerability in...","description":"An issue was discovered in gif2apng 1.9. There is a heap-based buffer overflow vulnerability in the DecodeLZW function. It allows an attacker to write a large amount of arbitrary data outside the boundaries of a buffer.","status":"published","published":"2021-12-29T00:00:46Z","modified":"2023-02-03T05:03:38Z","cvss":[{"version":"3.1","score":7.8,"vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","level":"high"}],"cwes":["CWE-787"],"updated_at":"2026-11-02T14:53:23.659712Z"}],"nvd":[{"id":"CVE-2021-45909","description":"An issue was discovered in gif2apng 1.9. There is a heap-based buffer overflow vulnerability in the DecodeLZW function. It allows an attacker to write a large amount of arbitrary data outside the boundaries of a buffer.","status":"published","published":"2021-12-28T01:15:07.52Z","modified":"2026-06-17T04:14:14.217Z","cvss":[{"version":"3.1","score":7.8,"vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/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-787"],"updated_at":"2026-11-02T14:07:02.977492Z"}],"osv":[{"id":"CVE-2021-45909","description":"An issue was discovered in gif2apng 1.9. There is a heap-based buffer overflow vulnerability in the DecodeLZW function. It allows an attacker to write a large amount of arbitrary data outside the boundaries of a buffer.","status":"published","published":"2021-12-28T01:15:07.52Z","modified":"2026-03-14T11:17:24.485654Z","cvss":[{"version":"3.1","score":7.8,"vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","level":"high"}],"updated_at":"2026-11-02T15:44:22.18434Z"},{"id":"DEBIAN-CVE-2021-45909","description":"An issue was discovered in gif2apng 1.9. There is a heap-based buffer overflow vulnerability in the DecodeLZW function. It allows an attacker to write a large amount of arbitrary data outside the boundaries of a buffer.","status":"published","published":"2021-12-28T01:15:07.52Z","modified":"2026-08-27T23:04:43.241678687Z","cvss":[{"version":"3.1","score":7.8,"vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","level":"high"}],"updated_at":"2026-11-02T15:45:35.799676Z"},{"id":"UBUNTU-CVE-2021-45909","description":"An issue was discovered in gif2apng 1.9. There is a heap-based buffer overflow vulnerability in the DecodeLZW function. It allows an attacker to write a large amount of arbitrary data outside the boundaries of a buffer.","status":"published","published":"2021-12-28T01:15:00Z","modified":"2026-02-04T02:24:09.249657Z","cvss":[{"version":"3.1","score":7.8,"vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","level":"high"}],"updated_at":"2026-11-02T15:54:30.277322Z"},{"id":"DLA-2937-1","title":"gif2apng - security update","status":"published","published":"2022-03-07T00:00:00Z","modified":"2026-03-09T01:23:34.835088Z","updated_at":"2026-11-02T15:46:11.189256Z"},{"id":"USN-5969-1","title":"gif2apng vulnerabilities","description":"It was discovered that gif2apng contained multiple heap-base overflows. An\nattacker could potentially exploit this to cause a denial of service (system\ncrash). (CVE-2021-45909, CVE-2021-45910, CVE-2021-45911)\n","status":"published","published":"2023-03-23T22:53:29Z","modified":"2026-06-25T13:31:54.493149864Z","updated_at":"2026-11-02T16:58:16.738762Z"}]}}