CVE-2021-30858

medium KEV

Published 2021-11-03 · Modified 2021-11-03

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CVSS v3

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CVSS v4 NEW

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not yet in upstream

VIR risk

7.0

Description

Apple iOS, iPadOS, and macOS WebKit contain a use-after-free vulnerability that leads to code execution when processing maliciously crafted web content. This vulnerability could impact HTML parsers that use WebKit, including but not limited to Apple Safari and non-Apple products which rely on WebKit for HTML processing.

CISA KEV

Vendor: Apple
Product: iOS, iPadOS, and macOS
Due date: 2021-11-17

Predictions

Exploit likelihood

99%

Patch ETA

—

Heuristic predictions, AS-IS, for prioritization only.

Mitigations

No mitigations published for this CVE yet.

The vendor-content worker queues fetches as references arrive (check back in a few minutes). Or — if you've already worked around this in production — publish your fix to the community-verified tier.

✚ Propose a mitigation on Community → Mitigations published via the community go through AI scoring + 2 human reviewers + 7-day silent objection window before landing here with source_tier=community-verified.

Exploits

Public proof-of-concept code below. AS-IS, for defenders and authorised testing only.

OS impact

SUSE Affected 1 release

Version	Status	Fixed in
—	Affected	—

Arch Fixed 1 release

Version	Status	Fixed in
—	Fixed	`2.32.4-1`

Debian Fixed 5 releases

Version	Status	Fixed in
trixie	Fixed	`2.32.4-1`
sid	Fixed	`2.32.4-1`
forky	Fixed	`2.32.4-1`
bullseye	Fixed	`2.32.4-1~deb11u1`
bookworm	Fixed	`2.32.4-1`

Red Hat Fixed 1 release

Version	Status	Fixed in
8	Fixed	—

Rocky Linux Fixed 1 release

Version	Status	Fixed in
8	Fixed	—

References

Community-verified mitigations for this CVE will appear above when contributors publish them.

Verify integrity in audit chain (admin only). AS-IS.