{"id":"CVE-2017-6420","details":"The wwunpack function in libclamav/wwunpack.c in ClamAV 0.99.2 allows remote attackers to cause a denial of service (use-after-free) via a crafted PE file with WWPack compression.","modified":"2026-04-16T06:20:00.952096200Z","published":"2017-08-07T03:29:00.307Z","related":["SUSE-SU-2018:0254-1","SUSE-SU-2018:0255-1","openSUSE-SU-2024:10685-1"],"references":[{"type":"ADVISORY","url":"https://github.com/varsleak/varsleak-vul/blob/master/clamav-vul/use-after-free/clamav-use-after-free-pe.md"},{"type":"ADVISORY","url":"https://security.gentoo.org/glsa/201804-16"},{"type":"REPORT","url":"https://bugzilla.clamav.net/show_bug.cgi?id=11798"},{"type":"FIX","url":"https://github.com/vrtadmin/clamav-devel/commit/dfc00cd3301a42b571454b51a6102eecf58407bc"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/cisco-talos/clamav","events":[{"introduced":"0"},{"last_affected":"5ceae552829ee65c9ecff8ff303b1f2ddfd11576"},{"fixed":"dfc00cd3301a42b571454b51a6102eecf58407bc"}],"database_specific":{"versions":[{"introduced":"0"},{"last_affected":"0.99.2"}]}}],"versions":["clamav-0.96","clamav-0.96.2","clamav-0.96.3","clamav-0.96.4","clamav-0.96.5","clamav-0.96rc1","clamav-0.96rc2","clamav-0.97","clamav-0.97rc","clamav-0.99.2","merge-llvm-97877","r5076"],"database_specific":{"vanir_signatures":[{"digest":{"function_hash":"139298605883294768074466177189333198170","length":3832},"deprecated":false,"signature_version":"v1","source":"https://github.com/cisco-talos/clamav/commit/dfc00cd3301a42b571454b51a6102eecf58407bc","id":"CVE-2017-6420-8db5ad48","target":{"function":"wwunpack","file":"libclamav/wwunpack.c"},"signature_type":"Function"},{"digest":{"threshold":0.9,"line_hashes":["35527508808006729459757378903195264297","136599601490254595440116583910458001390","213343516002541788284701737169634229176","38984029225980571671566102348353921465"]},"deprecated":false,"signature_version":"v1","source":"https://github.com/cisco-talos/clamav/commit/dfc00cd3301a42b571454b51a6102eecf58407bc","id":"CVE-2017-6420-c120f9f5","target":{"file":"libclamav/wwunpack.c"},"signature_type":"Line"}],"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2017-6420.json","vanir_signatures_modified":"2026-04-11T04:14:38Z"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H"}]}