CVE-2021-30849

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.

Published: 2021-10-19 Last update: 2024-11-21 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2021-30849 is rated Moderate Risk (48.3/100): CVSS High severity, with low exploitation likelihood (EPSS 0.26%). Review affected assets and schedule remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2021-30849

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-01-23 0.23% 0.26% +0.03%
2 2026-01-20 0.26% 0.23% -0.03%
3 2026-01-19 — 0.26% —

Full EPSS history (24 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2021-30849

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
7.8 3.1 HIGH
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H Click to expand
Attack vector (AV:L)
They already need access on the box, or another person has to do something wrong; it’s not a remote drive-by.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:R)
A real person has to do something—click, install, enable—otherwise it doesn’t land.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 1.8 5.9 [email protected]
6.8 2.0 MEDIUM
AV:N/AC:M/Au:N/C:P/I:P/A:P Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:M)
Exploitation needs some favorable conditions, but not exceptional ones.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:P)
Partial confidentiality impact.
Integrity impact (I:P)
Partial integrity impact.
Availability impact (A:P)
Partial availability impact.
 8.6 6.4 [email protected]

Weakness enumeration for CVE-2021-30849

OS Trackers for CVE-2021-30849

vendor priority summary link
alpine high CVE-2021-30849: 1 source package rows (webkit2gtk); 5 state rows across 5 repos (3.17-community, 3.18-community, 3.19-community, 3.20-community, edge-community); fixed 5, open 0. https://security.alpinelinux.org/vuln/CVE-2021-30849
debian not yet assigned CVE-2021-30849 not yet assigned priority: Debian including 2 source packages (webkit2gtk, wpewebkit), 10 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 10. https://security-tracker.debian.org/tracker/CVE-2021-30849
gentoo high CVE-2021-30849: 1 GLSA(s) (202202-01), 1 atom(s) (net-libs/webkit-gtk); latest impact high. https://bugs.gentoo.org/buglist.cgi?quicksearch=CVE-2021-30849
redhat medium — https://access.redhat.com/security/cve/CVE-2021-30849
suse high CVE-2021-30849 severity important: SUSE including 139 source package names (WebKit2GTK-4.1-lang-2.36.0-150400.2.13, WebKit2GTK-5.0-lang-2.36.0-150400.2.12, …), 430 product×package rows across 60 product lines (HPE Helion OpenStack 8, SUSE CaaS Platform 4.0, … (60 product lines)): Fixed 427, Known Not Affected 3. https://www.suse.com/security/cve/CVE-2021-30849/
ubuntu medium CVE-2021-30849 medium priority: Ubuntu including 5 source packages (qtwebkit-opensource-src, qtwebkit-source, webkit2gtk, webkitgtk, wpewebkit), 60 status rows across 12 suites (bionic, focal, hirsute, impish, jammy, kinetic, lunar, mantic, noble, trusty, upstream, xenial): DNE 27, ignored 20, not-affected 6, released 4, needs-triage 3. https://ubuntu.com/security/CVE-2021-30849

Affected software / configurations for CVE-2021-30849

Vendor Product Version Raw CPE
apple itunes < 12.12 cpe:2.3:a:apple:itunes:*:*:*:*:*:windows:*:*
apple safari < 15.0 cpe:2.3:a:apple:safari:*:*:*:*:*:*:*:*
apple ipados < 14.8 cpe:2.3:o:apple:ipados:*:*:*:*:*:*:*:*
apple iphone_os < 14.8 cpe:2.3:o:apple:iphone_os:*:*:*:*:*:*:*:*
apple macos < 12.0.1 cpe:2.3:o:apple:macos:*:*:*:*:*:*:*:*
apple tvos < 15.0 cpe:2.3:o:apple:tvos:*:*:*:*:*:*:*:*
apple watchos < 8.0 cpe:2.3:o:apple:watchos:*:*:*:*:*:*:*:*

References for CVE-2021-30849

URL Tags
http://seclists.org/fulldisclosure/2021/Oct/60 Mailing List Third Party Advisory
http://seclists.org/fulldisclosure/2021/Oct/61 Mailing List Third Party Advisory
http://seclists.org/fulldisclosure/2021/Oct/62 Mailing List Third Party Advisory
http://seclists.org/fulldisclosure/2021/Oct/63 Mailing List Third Party Advisory
http://www.openwall.com/lists/oss-security/2021/10/26/9 Mailing List
http://www.openwall.com/lists/oss-security/2021/10/27/1 Mailing List
http://www.openwall.com/lists/oss-security/2021/10/27/2 Mailing List
http://www.openwall.com/lists/oss-security/2021/10/27/4 Mailing List
https://support.apple.com/en-us/HT212807 Vendor Advisory
https://support.apple.com/en-us/HT212814 Vendor Advisory
https://support.apple.com/en-us/HT212815 Vendor Advisory
https://support.apple.com/en-us/HT212816 Vendor Advisory
https://support.apple.com/en-us/HT212817 Vendor Advisory
https://support.apple.com/en-us/HT212819 Vendor Advisory
https://support.apple.com/kb/HT212869 Vendor Advisory
https://support.apple.com/kb/HT212953 Vendor Advisory
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