VULNERABILITY INTELLIGENCE

CVE-2017-17821

CVSS score9.8 CRITICAL

EPSS probability1.38%

CISA KEVNot currently listed

Published2017-12-21

Last modified2026-06-17

CVSS vectorCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

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.

Weakness classification

CWE-119: Improper Restriction of Operations within the Bounds of a Memory Buffer

Primary references

cve@mitre.org — Permissions Required
cve@mitre.org — Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108 — Permissions Required
af854a3a-2127-422b-91ae-364da2661108 — Third Party Advisory