CVE-2017-17821

CRITICAL 9.8CVE-2017-17821 · Published 21/12/2017 · updated 17/06/2026

In short

CVE-2017-17821 is a CRITICAL (CVSS 9.8) vulnerability affecting safari (apple).
Chance of exploitation in the next 30 days (EPSS): 1.4%, higher than 72.2% of all vulnerabilities.
No patched version is listed yet: follow the vendor's advisory in References.

Package	Affected versions	Patched versions
safari apple	`= 46`	No fix yet

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

bugs.webkit.org/show_bug.cgi · Permissions Required
dwfault/PoCs · Third Party Advisory

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Package

Affected versions

Patched versions

safari

apple

= 46

No fix yet

Description

More vulnerabilities in safari

See all →