{"id":"CVE-2021-39554","aliases":["EUVD-2021-25911","GHSA-rh42-ggpq-295x","UBUNTU-CVE-2021-39554"],"status":"published","title":"An issue was discovered in swftools through 20200710. A NULL pointer dereference exists in the...","description":"An issue was discovered in swftools through 20200710. A NULL pointer dereference exists in the function Lexer::Lexer() located in Lexer.cc. It allows an attacker to cause Denial of Service.","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":"2026-11-12","score":0.00635,"percentile":0.50915,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-476"],"published":"2021-09-20T15:27:06Z","modified":"2026-06-17T04:03:48Z","affected":[{"source":"osv","ecosystem":"Ubuntu:16.04:LTS","package":"swftools","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.9.2+git20130725-2","0.9.2+git20130725-2ubuntu1","0.9.2+git20130725-4","0.9.2+git20130725-4.1~build0.16.04.1"]},{"source":"osv","ecosystem":"Ubuntu:18.04:LTS","package":"swftools","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.9.2+git20130725-4.1"]}],"products":[{"vendor":"swftools","product":"swftools"}],"references":[{"url":"https://github.com/matthiaskramm/swftools/issues/100","tags":["x_refsource_MISC","x_transferred","Exploit","Issue Tracking","Third Party Advisory","report"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-39554"},{"url":"https://github.com/advisories/GHSA-rh42-ggpq-295x"},{"url":"https://ubuntu.com/security/CVE-2021-39554","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2021-39554","tags":["report"]}],"sources":{"cve":[{"id":"CVE-2021-39554","description":"An issue was discovered in swftools through 20200710. A NULL pointer dereference exists in the function Lexer::Lexer() located in Lexer.cc. It allows an attacker to cause Denial of Service.","status":"published","published":"2021-09-20T15:27:06Z","modified":"2024-08-04T02:06:42.643Z","updated_at":"2026-11-02T14:33:09.540052Z"}],"euvd":[{"id":"EUVD-2021-25911","description":"An issue was discovered in swftools through 20200710. A NULL pointer dereference exists in the function Lexer::Lexer() located in Lexer.cc. It allows an attacker to cause Denial of Service.","status":"published","published":"2021-09-20T15:27:06Z","modified":"2024-08-04T02:06:42Z","updated_at":"2026-11-03T03:24:23.166742Z"}],"ghsa":[{"id":"GHSA-rh42-ggpq-295x","title":"An issue was discovered in swftools through 20200710. A NULL pointer dereference exists in the...","description":"An issue was discovered in swftools through 20200710. A NULL pointer dereference exists in the function Lexer::Lexer() located in Lexer.cc. It allows an attacker to cause Denial of Service.","status":"published","published":"2022-05-24T19:15:07Z","modified":"2023-01-30T05:02:17Z","cwes":["CWE-476"],"updated_at":"2026-11-02T14:46:36.123786Z"}],"nvd":[{"id":"CVE-2021-39554","description":"An issue was discovered in swftools through 20200710. A NULL pointer dereference exists in the function Lexer::Lexer() located in Lexer.cc. It allows an attacker to cause Denial of Service.","status":"published","published":"2021-09-20T16:15:13.227Z","modified":"2026-06-17T04:03:48.72Z","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":"2026-11-02T14:06:58.933037Z"}],"osv":[{"id":"UBUNTU-CVE-2021-39554","description":"An issue was discovered in swftools through 20200710. A NULL pointer dereference exists in the function Lexer::Lexer() located in Lexer.cc. It allows an attacker to cause Denial of Service.","status":"published","published":"2021-09-20T16:15:00Z","modified":"2025-10-24T04:50:30Z","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":"2026-11-02T15:54:28.526929Z"}]}}