{"id":"CVE-2021-4043","aliases":["DEBIAN-CVE-2021-4043","DSA-5411-1","EUVD-2021-33941","GHSA-jm63-cmh5-jrcj","UBUNTU-CVE-2021-4043"],"status":"published","title":"NULL Pointer Dereference in gpac/gpac","description":"NULL Pointer Dereference in GitHub repository gpac/gpac prior to 1.1.0.","severity":{"version":"3.0","score":5.8,"vector":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:L","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-09","score":0.04615,"percentile":0.91751,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":true,"fix_available":true},"cwes":["CWE-476"],"published":"2022-02-04T00:00:00Z","modified":"2026-11-05T08:07:05Z","exploits":[{"source":"pocgithub","id":"cyberark/PwnKit-Hunter","title":"cyberark/PwnKit-Hunter","date":"2022-01-30","url":"https://github.com/cyberark/PwnKit-Hunter"}],"fixes":[{"ecosystem":"Debian:11","package":"gpac","fixed_in":["1.0.1+dfsg1-4+deb11u2"],"sources":["osv"]}],"affected":[{"source":"osv","ecosystem":"Debian:11","package":"gpac","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.0.1+dfsg1-4+deb11u2"}]}],"versions":["1.0.1+dfsg1-4","1.0.1+dfsg1-4+deb11u1"]},{"source":"osv","ecosystem":"Debian:11","package":"gpac","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.0.1+dfsg1-4+deb11u2"}]}],"versions":["1.0.1+dfsg1-4","1.0.1+dfsg1-4+deb11u1"],"bundled":106}],"products":[{"vendor":"debian","product":"debian_linux"},{"vendor":"gpac","product":"gpac"},{"vendor":"gpac","product":"gpac/gpac"}],"references":[{"url":"https://huntr.dev/bounties/d7a534cb-df7a-48ba-8ce3-46b1551a9c47","tags":["x_transferred","Exploit","Issue 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