Which products and versions are affected by CVE-2021-30661?

Affected: Safari (Apple) versions >= unspecified; Ipados (Apple); Iphone OS (Apple), among others. The full list is in the CVE brief.

Is CVE-2021-30661 being exploited in the wild?

It is exploited in the wild, listed in CISA KEV, Industry KEV feed, CIRCL KEV, ENISA EUVD since Apr 26, 2021.

Is CVE-2021-30661 in the CISA KEV catalog?

Yes. It was added on Nov 3, 2021 with a federal remediation due date of Nov 17, 2021.

Is there a public exploit for CVE-2021-30661?

Public exploit code is available.

Is there a fix for CVE-2021-30661?

Fixed versions are available, including accountsservice 0.6.55-1.el8, Ipados 14.5, Iphone OS 12.5.3.

How urgently should CVE-2021-30661 be patched?

Brandefense priority: patch immediately, because it is listed as exploited in the wild.

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Vulnerability Intelligence

CVE-2021-30661

HighExploitedPublic exploit

webkitgtk: Use-after-free leading to arbitrary code execution

Published Oct 13, 2021 · Updated Aug 4, 2026 · Also known as DEBIAN-CVE-2021-30661, UBUNTU-CVE-2021-30661

Key Facts

Patch immediately

CVE-2021-30661 is a high-severity vulnerability (CVSS 8.8 v3.1) affecting Safari (Apple), Ipados (Apple), Iphone OS (Apple) and 22 more products.
It is exploited in the wild, listed in CISA KEV, Industry KEV feed, CIRCL KEV, ENISA EUVD since Apr 26, 2021. Public exploit code is available.
EPSS estimates a 4.5% probability of exploitation in the next 30 days.
Fixed versions are available, including accountsservice 0.6.55-1.el8, Ipados 14.5, Iphone OS 12.5.3.
Brandefense priority: patch immediately, because it is listed as exploited in the wild.

CVSS v3.1

8.8

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

EPSS (30-day exploit likelihood)

4.5%

Higher than 91.3% of all scored CVEs

Exploited in the wild

Yes

4 catalog listings

Public exploit code

Available

Proof-of-concept or weaponized module

Get the full CVE-2021-30661 brief as a PDF

Every affected product and fixed release, exploitation status and a first 24 hours response checklist, emailed within minutes.

Description

A use after free issue was addressed with improved memory management. This issue is fixed in Safari 14.1, iOS 12.5.3, iOS 14.5 and iPadOS 14.5, watchOS 7.4, tvOS 14.5, macOS Big Sur 11.3. Processing maliciously crafted web content may lead to arbitrary code execution. Apple is aware of a report that this issue may have been actively exploited..

Known-Exploited Catalog Listings

Catalog	Added	Remediation due	Ransomware use
CISA KEV	Nov 3, 2021	Nov 17, 2021	Not reported
Industry KEV feed	Apr 26, 2021	Nov 17, 2021	Not reported
CIRCL KEV	Nov 3, 2021	Nov 17, 2021	Not reported
ENISA EUVD	Nov 3, 2021	n/a	Not reported

Required action: Apply updates per vendor instructions.

Affected Products

455 affected entries in total

Product	Affected versions	Fixed in
SafariApple	>= unspecified	14.1
IpadosApple	See advisory	14.5
Iphone OSApple	See advisory	12.5.3
macOSApple	>= unspecified	11.3
tvOSApple	>= unspecified	14.5

20 more affected products in the full CVE brief

Patched Releases

accountsservice

0.6.55-1.el8

Ipados

14.5

Iphone OS

12.5.3

macOS

11.3, 12.5

Safari

14.1

tvOS

14.5

watchOS

7.4

atkmm

2.24.2-7.el8

cairomm

1.12.0-8.el8

chrome-gnome-shell

10.1-7.el8

dleyna-core

0.6.0-3.el8

dleyna-server

0.6.0-3.el8

enchant2

2.2.3-3.el8

gamin

0.1.10-32.el8

gdm

1:3.28.3-39.el8

geoclue2

2.5.5-2.el8

geocode-glib

3.26.0-3.el8

gjs

1.56.2-5.el8

glib2

2.28.8-11.el6_10+sp999, 2.56.1-7.el7+sp999, 2.56.4-9.el8

glibmm24

2.56.0-2.el8

gnome-boxes

3.36.5-8.el8, 3.36.5-8.el8.rocky.0.1

gnome-control-center

3.28.2-27.el8

gnome-online-accounts

3.28.2-2.el8

gnome-photos

3.28.1-4.el8

gnome-settings-daemon

3.32.0-14.el8

Timeline

Added to Industry KEV feed
Apr 26, 2021
Publicly disclosed
Oct 13, 2021
Added to CISA KEV
Nov 3, 2021
Added to CIRCL KEV
Nov 3, 2021
Added to ENISA EUVD
Nov 3, 2021
Last updated
Aug 4, 2026

Weakness Type

CWE-20 Improper Input Validation
CWE-416 Use After Free

References

advisoryhttp://feedproxy.google.com/~r/TheHackersNews/~3/elwYiDkfEBM/apple-releases-urgent-iphone-and-ipad.html
advisoryhttps://access.redhat.com/errata/RHEA-2021:3139
advisoryRHSA-2021:1586
advisoryRHSA-2025:10364
advisoryhttps://bugzilla.suse.com/1194019

15 more references in the full CVE brief

FAQ

Common Questions.

A use after free issue was addressed with improved memory management.
Affected: Safari (Apple) versions >= unspecified; Ipados (Apple); Iphone OS (Apple), among others. The full list is in the CVE brief.
It is exploited in the wild, listed in CISA KEV, Industry KEV feed, CIRCL KEV, ENISA EUVD since Apr 26, 2021.
Yes. It was added on Nov 3, 2021 with a federal remediation due date of Nov 17, 2021.
Public exploit code is available.
Fixed versions are available, including accountsservice 0.6.55-1.el8, Ipados 14.5, Iphone OS 12.5.3.
Brandefense priority: patch immediately, because it is listed as exploited in the wild.

Is CVE-2021-30661 Running On Your Attack Surface?

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