{"id":"CVE-2017-17821","aliases":["DEBIAN-CVE-2017-17821","EUVD-2017-8972","GHSA-353g-x49j-hjg7","UBUNTU-CVE-2017-17821"],"status":"published","title":"WTF/wtf/FastBitVector.h in WebKit, as distributed in Safari Technology Preview Release 46, allows...","description":"WTF/wtf/FastBitVector.h in WebKit, as distributed in Safari Technology Preview Release 46, allows remote attackers to cause a denial of service (buffer overflow) or possibly have unspecified other impact because it calls the FastBitVectorWordOwner::resizeSlow function (in WTF/wtf/FastBitVector.cpp) for a purpose other than initializing a bitvector size, and resizeSlow mishandles cases where the old array length is greater than the new array length.","severity":{"version":"3.0","score":9.8,"vector":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-08","score":0.01379,"percentile":0.72283,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-119"],"published":"2017-12-21T03:00:00Z","modified":"2026-09-01T20:03:45Z","fixes":[{"ecosystem":"Debian:12","package":"webkit2gtk","fixed_in":["2.22.0-2"],"sources":["osv"]},{"ecosystem":"Debian:13","package":"webkit2gtk","fixed_in":["2.22.0-2"],"sources":["osv"]},{"ecosystem":"Debian:14","package":"webkit2gtk","fixed_in":["2.22.0-2"],"sources":["osv"]}],"affected":[{"source":"osv","ecosystem":"Debian:12","package":"webkit2gtk","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.22.0-2"}]}]},{"source":"osv","ecosystem":"Debian:13","package":"webkit2gtk","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.22.0-2"}]}]},{"source":"osv","ecosystem":"Debian:14","package":"webkit2gtk","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.22.0-2"}]}]},{"source":"osv","ecosystem":"Ubuntu:16.04:LTS","package":"qtwebkit-opensource-src","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["5.4.2+dfsg-1ubuntu2.1","5.5.1+dfsg-2ubuntu1"]},{"source":"osv","ecosystem":"Ubuntu:16.04:LTS","package":"qtwebkit-source","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.3.2-0ubuntu10","2.3.2-0ubuntu11"]},{"source":"osv","ecosystem":"Ubuntu:16.04:LTS","package":"webkitgtk","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.4.9-2ubuntu2","2.4.10-0ubuntu1","2.4.11-0ubuntu0.1"]},{"source":"osv","ecosystem":"Ubuntu:18.04:LTS","package":"qtwebkit-opensource-src","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["5.9.1+dfsg-5ubuntu1","5.9.1+dfsg-5ubuntu3","5.212.0~alpha2-5build2","5.212.0~alpha2-5build4","5.212.0~alpha2-7","5.212.0~alpha2-7build2","5.212.0~alpha2-7ubuntu1"]},{"source":"osv","ecosystem":"Ubuntu:18.04:LTS","package":"qtwebkit-source","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.3.2-0ubuntu13"]},{"source":"osv","ecosystem":"Ubuntu:18.04:LTS","package":"webkitgtk","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.4.11-3","2.4.11-3ubuntu2","2.4.11-3ubuntu3"]},{"source":"osv","ecosystem":"Ubuntu:20.04:LTS","package":"qtwebkit-opensource-src","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["5.212.0~alpha3-3","5.212.0~alpha3-5","5.212.0~alpha3-6","5.212.0~alpha3-7","5.212.0~alpha4-1","5.212.0~alpha4-1ubuntu1","5.212.0~alpha4-1ubuntu2","5.212.0~alpha4-1ubuntu2.1"]},{"source":"osv","ecosystem":"Ubuntu:22.04:LTS","package":"qtwebkit-opensource-src","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["5.212.0~alpha4-12","5.212.0~alpha4-13","5.212.0~alpha4-14","5.212.0~alpha4-14build1","5.212.0~alpha4-14ubuntu2","5.212.0~alpha4-15ubuntu1"]},{"source":"osv","ecosystem":"Ubuntu:24.04:LTS","package":"qtwebkit-opensource-src","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["5.212.0~alpha4-33","5.212.0~alpha4-33build1","5.212.0~alpha4-34","5.212.0~alpha4-34ubuntu3","5.212.0~alpha4-34ubuntu4","5.212.0~alpha4-36"]}],"products":[{"vendor":"apple","product":"safari"}],"references":[{"url":"https://bugs.webkit.org/show_bug.cgi?id=181020","tags":["x_refsource_MISC","x_transferred","Permissions Required","report"]},{"url":"https://github.com/dwfault/PoCs/blob/master/WebKit%20Misuse%20of%20WTF:wtf:FastBitVector%20result%20in%20potential%20BOF/WebKit%20Misuse%20of%20WTF:wtf:FastBitVector%20result%20in%20potential%20BOF.md","tags":["x_refsource_MISC","x_transferred","Third Party Advisory","advisory","report"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2017-17821"},{"url":"https://github.com/advisories/GHSA-353g-x49j-hjg7"},{"url":"https://security-tracker.debian.org/tracker/CVE-2017-17821","tags":["advisory"]},{"url":"https://ubuntu.com/security/CVE-2017-17821","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2017-17821","tags":["report"]}],"sources":{"cve":[{"id":"CVE-2017-17821","description":"WTF/wtf/FastBitVector.h in WebKit, as distributed in Safari Technology Preview Release 46, allows remote attackers to cause a denial of service (buffer overflow) or possibly have unspecified other impact because it calls the FastBitVectorWordOwner::resizeSlow function (in WTF/wtf/FastBitVector.cpp) for a purpose other than initializing a bitvector size, and resizeSlow mishandles cases where the old array length is greater than the new array length.","status":"published","published":"2017-12-21T03:00:00Z","modified":"2024-08-05T20:59:18Z","updated_at":"2026-11-02T14:33:18.556155Z"}],"euvd":[{"id":"EUVD-2017-8972","description":"WTF/wtf/FastBitVector.h in WebKit, as distributed in Safari Technology Preview Release 46, allows remote attackers to cause a denial of service (buffer overflow) or possibly have unspecified other impact because it calls the FastBitVectorWordOwner::resizeSlow function (in WTF/wtf/FastBitVector.cpp) for a purpose other than initializing a bitvector size, and resizeSlow mishandles cases where the old array length is greater than the new array length.","status":"published","published":"2017-12-21T03:00:00Z","modified":"2024-08-05T20:59:18Z","updated_at":"2026-11-03T02:23:08.488418Z"}],"ghsa":[{"id":"GHSA-353g-x49j-hjg7","title":"WTF/wtf/FastBitVector.h in WebKit, as distributed in Safari Technology Preview Release 46, allows...","description":"WTF/wtf/FastBitVector.h in WebKit, as distributed in Safari Technology Preview Release 46, allows remote attackers to cause a denial of service (buffer overflow) or possibly have unspecified other impact because it calls the FastBitVectorWordOwner::resizeSlow function (in WTF/wtf/FastBitVector.cpp) for a purpose other than initializing a bitvector size, and resizeSlow mishandles cases where the old array length is greater than the new array length.","status":"published","published":"2022-05-14T03:51:06Z","modified":"2023-02-03T05:00:43Z","cvss":[{"version":"3.0","score":9.8,"vector":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical"}],"cwes":["CWE-119"],"updated_at":"2026-11-02T14:52:50.947535Z"}],"nvd":[{"id":"CVE-2017-17821","description":"WTF/wtf/FastBitVector.h in WebKit, as distributed in Safari Technology Preview Release 46, allows remote attackers to cause a denial of service (buffer overflow) or possibly have unspecified other impact because it calls the FastBitVectorWordOwner::resizeSlow function (in WTF/wtf/FastBitVector.cpp) for a purpose other than initializing a bitvector size, and resizeSlow mishandles cases where the old array length is greater than the new array length.","status":"published","published":"2017-12-21T03:29:00.63Z","modified":"2026-06-17T01:11:42.767Z","cvss":[{"version":"3.0","score":9.8,"vector":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical","assessor":"primary"},{"version":"2.0","score":7.5,"vector":"AV:N/AC:L/Au:N/C:P/I:P/A:P","level":"high","assessor":"primary"}],"cwes":["CWE-119"],"updated_at":"2026-11-02T14:04:11.215487Z"}],"osv":[{"id":"CVE-2017-17821","description":"WTF/wtf/FastBitVector.h in WebKit, as distributed in Safari Technology Preview Release 46, allows remote attackers to cause a denial of service (buffer overflow) or possibly have unspecified other impact because it calls the FastBitVectorWordOwner::resizeSlow function (in WTF/wtf/FastBitVector.cpp) for a purpose other than initializing a bitvector size, and resizeSlow mishandles cases where the old array length is greater than the new array length.","status":"published","published":"2017-12-21T03:29:00.63Z","modified":"2026-03-14T09:22:35.791572Z","cvss":[{"version":"3.0","score":9.8,"vector":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical"}],"updated_at":"2026-11-02T15:44:04.853379Z"},{"id":"DEBIAN-CVE-2017-17821","description":"WTF/wtf/FastBitVector.h in WebKit, as distributed in Safari Technology Preview Release 46, allows remote attackers to cause a denial of service (buffer overflow) or possibly have unspecified other impact because it calls the FastBitVectorWordOwner::resizeSlow function (in WTF/wtf/FastBitVector.cpp) for a purpose other than initializing a bitvector size, and resizeSlow mishandles cases where the old array length is greater than the new array 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