CVE-2017-17821

CRITICAL

Apple Safari - Memory Corruption

Title source: rule

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.

References (2)

Core 2

Core References

Permissions Required x_refsource_misc

https://bugs.webkit.org/show_bug.cgi?id=181020

Third Party Advisory x_refsource_misc

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

View Writeup ZIP pw:eip

Scores

CVSS v3 9.8

EPSS 0.0068

EPSS Percentile 71.6%

Attack Vector NETWORK

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

Details

CWE

CWE-119

Status published

Products (1)

apple/safari 46

Published Dec 21, 2017

Tracked Since Feb 18, 2026