CVE-2017-17821

Critical

Published: 21/12/2017(UTC)Translated: 14/06/2026(UTC)NVD NIST

Summary

WTF/wtf/FastBitVector.h in WebKit, distributed in Safari Technology Preview Release 46, allows remote attackers to cause a denial of service (buffer overflow) or possibly have unspecified other impact. The issue arises from an improper call to the resizeSlow function, which mishandles cases where the old array length is greater than the new array length.

Risk Assessment

The organization may be exposed to attacks leading to denial of service, potentially resulting in service availability interruptions. Additionally, unspecified impacts may lead to further security issues.

Recommendation

It is recommended to update Safari to the latest version to mitigate this vulnerability. Also, monitor systems for unauthorized access attempts.

Original NVD description (English source)

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.