CVE-2021-30849 json
Multiple memory corruption issues were addressed with improved memory handling.
published 2021-10-19 5 y ago modified 2026-06-17 4 mo ago also EUVD-2021-17766
- cvss
- 7.8
- version 3.1, NVD
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 1.9%
- EPSS 1.9% chance of exploitation in 30 days, percentile 79%
- public exploits
- 0
- none known
Summary
Multiple memory corruption issues were addressed with improved memory handling. This issue is fixed in iOS 14.8 and iPadOS 14.8, watchOS 8, Safari 15, tvOS 15, iOS 15 and iPadOS 15, iTunes 12.12 for Windows. Processing maliciously crafted web content may lead to arbitrary code execution.
Patch / fix
- Apple iOS and iPadOS 14.8, 15
- Apple tvOS 15
- Apple Safari 15
- Apple iTunes for Windows 12.12
- Apple watchOS 8
- wpewebkit Debian 14, Debian 13, Debian 12 2.32.4-1
- webkit2gtk Debian 14, Debian 13, Debian 12 2.32.4-1
debian advisories DEBIAN-CVE-2021-30849
- webkit2gtk Ubuntu 18.04 LTS 2.32.4-0ubuntu0.18.04.1
- webkit2gtk Ubuntu 20.04 LTS 2.32.4-0ubuntu0.20.04.1
ubuntu advisories UBUNTU-CVE-2021-30849
Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0
- webkit2gtk3 RHEL 8 2.34.6-1.el8
- webkit2gtk3-jsc RHEL 8 2.34.6-1.el8
- webkitgtk4 RHEL 7 ELS 2.48.3-2.el7_9
- webkitgtk4-jsc RHEL 7 ELS 2.48.3-2.el7_9
red hat advisories RHSA-2025:10364RHSA-2022:1777
- webkit2gtk3 SLES 15 SP2-BCL, SLE Real Time 15 SP2, SLE Module for Desktop Applications 15 SP3 +9 more 2.34.3-23.3
- webkit2gtk3 SLES for SAP 15 SP1, SLES for SAP 15, SLES 15-LTSS +7 more 2.34.3-3.92.1
- webkit2gtk3 SLES for SAP 12 SP5, SLES for SAP 12 SP4, SLES for SAP 12 SP3 +11 more 2.34.3-2.82.1
suse advisories SUSE-SU-2022:0182-2SUSE-SU-2022:0183-1SUSE-SU-2022:0182-1SUSE-SU-2022:0142-1
- webkit2gtk3 openSUSE Leap 15.3 2.34.3-23.3
opensuse advisories openSUSE-SU-2022:0182-1
- webkit2gtk3 AlmaLinux 8 2.34.6-1.el8
- webkit2gtk3-jsc AlmaLinux 8 2.34.6-1.el8
almalinux advisories ALSA-2022:1777
- webkit2gtk3 Rocky Linux 8 2.34.6-1.el8
rocky linux advisories RLSA-2022:1777
- webkit2gtk Alpine 3.20, Alpine 3.19, Alpine 3.18 +3 more 2.32.4-r0
alpine advisories ALPINE-CVE-2021-30849
Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0
- wpewebkit Arch Linux 2.32.4-1
arch linux advisories AVG-2400
Vendor advisories
What the vendors themselves say about their products: affected, fixed or not affected, and what to do.
red hat product security vex CVE-2021-30849 updated cvss 7.8
webkitgtk: Multiple memory corruption issue leading to arbitrary code execution
-
Red Hat Enterprise Linux 6 webkitgtk Red Hat Enterprise Linux 7 webkitgtk3, libwebkit2gtkaffected: no fix planned “Out of support scope”
-
Red Hat Enterprise Linux AppStream (v. 8) webkit2gtk3 2.34.6-1.el8, webkit2gtk3-jsc 2.34.6-1.el8fixed: vendor fix RHSA-2022:1777
-
Red Hat Enterprise Linux Server (v. 7 ELS) webkitgtk4 2.48.3-2.el7_9, webkitgtk4-jsc 2.48.3-2.el7_9 Red Hat Enterprise Linux Server Optional (v. 7 ELS) webkitgtk4-doc 2.48.3-2.el7_9, webkitgtk4-devel 2.48.3-2.el7_9, webkitgtk4-debuginfo 2.48.3-2.el7_9, webkitgtk4-jsc-devel 2.48.3-2.el7_9fixed: vendor fix RHSA-2025:10364
-
Red Hat Enterprise Linux 9 webkit2gtk3, webkit2gtk3-jscnot affected: vulnerable code not present
Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf
Exploit prediction
1.90% chance of exploitation in the next 30 days, higher than 79% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| NVD | 3.1 | 7.8 | CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H |
| NVD | 2.0 | 6.8 | AV:N/AC:M/Au:N/C:P/I:P/A:P |
Affected products
- Apple iOS and iPadOS
- Apple tvOS
- Apple Safari
- Apple iTunes for Windows
- Apple watchOS
Classification
- Weakness
-
- CWE-787 Out-of-bounds Write
References
-
support.apple.com
/en-us/HT212807
vendor-advisory
-
support.apple.com
/en-us/HT212814
vendor-advisory
-
support.apple.com
/en-us/HT212819
vendor-advisory
-
support.apple.com
/en-us/HT212815
vendor-advisory
-
support.apple.com
/en-us/HT212817
vendor-advisory
-
support.apple.com
/en-us/HT212816
vendor-advisory
-
support.apple.com
/kb/HT212869
vendor-advisory
-
support.apple.com
/kb/HT212953
vendor-advisory
-
openwall.com
/lists/oss-security/2021/10/26/9
mailing-list
-
openwall.com
/lists/oss-security/2021/10/27/1
mailing-list
-
openwall.com
/lists/oss-security/2021/10/27/2
mailing-list
-
seclists.org
/fulldisclosure/2021/Oct/60
mailing-list, third-party-advisory
-
seclists.org
/fulldisclosure/2021/Oct/62
mailing-list, third-party-advisory
-
seclists.org
/fulldisclosure/2021/Oct/63
mailing-list, third-party-advisory
-
seclists.org
/fulldisclosure/2021/Oct/61
mailing-list, third-party-advisory
-
openwall.com
/lists/oss-security/2021/10/27/4
mailing-list
Sources
- CVE List CVE-2021-30849
- NVD CVE-2021-30849
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.