CVE-2021-1789
HighExploitedPublic exploitA type confusion issue was addressed with improved state handling.
Published Apr 2, 2021 · Updated Aug 4, 2026 · Also known as DEBIAN-CVE-2021-1789, UBUNTU-CVE-2021-1789
Key Facts
Patch immediately- CVE-2021-1789 is a high-severity vulnerability (CVSS 8.8 v3.1) affecting Webkitgtk, 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 Oct 11, 2021. Public exploit code is available.
- EPSS estimates a 14% probability of exploitation in the next 30 days.
- Fixed versions are available, including accountsservice 0.6.55-2.el8, accountsservice-devel 0.6.55-2.el8, accountsservice-libs 0.6.55-2.el8.
- 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)
14%
Higher than 96.5% 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-2021-1789 brief as a PDF
Every affected product and fixed release, exploitation status and a first 24 hours response checklist, emailed within minutes.
Description
A type confusion issue was addressed with improved state handling. This issue is fixed in macOS Big Sur 11.2, Security Update 2021-001 Catalina, Security Update 2021-001 Mojave, tvOS 14.4, watchOS 7.3, iOS 14.4 and iPadOS 14.4, Safari 14.0.3. Processing maliciously crafted web content may lead to arbitrary code execution.
Known-Exploited Catalog Listings
| Catalog | Added | Remediation due | Ransomware use |
|---|---|---|---|
| CISA KEV | May 4, 2022 | May 25, 2022 | Not reported |
| Industry KEV feed | Oct 11, 2021 | May 25, 2022 | Not reported |
| CIRCL KEV | May 4, 2022 | May 25, 2022 | Not reported |
| ENISA EUVD | May 4, 2022 | n/a | Not reported |
Required action: Apply updates per vendor instructions.
Affected Products
427 affected entries in total| Product | Affected versions | Fixed in |
|---|---|---|
| WebkitgtkWebkitgtk | See advisory | 2.30.6 |
| IpadosApple | See advisory | 14.4 |
| Iphone OSApple | See advisory | 14.4 |
| macOSApple | >= unspecified | 11.2 |
| Mac OS XApple | 10.14.6, 10.14.6-security_update_2019-004, 10.14.6-security_update_2019-005, 10.14.6-security_update_2019-006, 10.14.6-security_update_2019-007, 10.14.6-security_update_2020-001, 10.14.6-security_update_2020-002, 10.14.6-security_update_2020-003 | 10.14.6 |
Patched Releases
accountsservice
0.6.55-2.el8
accountsservice-devel
0.6.55-2.el8
accountsservice-libs
0.6.55-2.el8
Ipados
14.4
Iphone OS
14.4
Mac OS X
10.14.6
macOS
11.2, 14.0, 14.4, 7.3
Tvos
14.4
Watchos
7.3
gdm
1:40.0-15.el8
gnome-autoar
0.2.3-2.el8
gnome-calculator
3.28.2-2.el8
gnome-classic-session
3.32.1-20.el8
gnome-control-center
3.28.2-28.el8
gnome-control-center-filesystem
3.28.2-28.el8
gnome-online-accounts
3.28.2-3.el8
gnome-online-accounts-devel
3.28.2-3.el8
gnome-session
3.28.1-13.0.1.el8, 3.28.1-13.el8
gnome-session-kiosk-session
3.28.1-13.0.1.el8
gnome-session-wayland-session
3.28.1-13.0.1.el8
gnome-session-xsession
3.28.1-13.0.1.el8
gnome-settings-daemon
3.32.0-16.el8, 3.32.0-16.el8_6.1, 3.32.0-16.el8.alma
gnome-shell
3.32.2-40.el8
gnome-shell-extension-apps-menu
3.32.1-20.el8
gnome-shell-extension-auto-move-windows
3.32.1-20.el8
Timeline
Publicly disclosed
Apr 2, 2021
Added to Industry KEV feed
Oct 11, 2021
Added to CISA KEV
May 4, 2022
Added to CIRCL KEV
May 4, 2022
Added to ENISA EUVD
May 4, 2022
Last updated
Aug 4, 2026
Weakness Type
- CWE-843 Access of Resource Using Incompatible Type ('Type Confusion')
References
- advisoryRHSA-2021:4381
- advisoryRHSA-2025:10364
- advisoryhttps://bugzilla.suse.com/1177087
- advisoryhttps://bugzilla.suse.com/1179122
- advisoryhttps://bugzilla.suse.com/1179451
FAQ
Common Questions.
A type confusion issue was addressed with improved state handling.
Affected: Webkitgtk; 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 Oct 11, 2021.
Yes. It was added on May 4, 2022 with a federal remediation due date of May 25, 2022.
Public exploit code is available.
Fixed versions are available, including accountsservice 0.6.55-2.el8, accountsservice-devel 0.6.55-2.el8, accountsservice-libs 0.6.55-2.el8.
Brandefense priority: patch immediately, because it is listed as exploited in the wild.
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