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CVE-2021-30809

29
FAUCET Score

CVE-2021-30809 is a use-after-free vulnerability affecting Apple's Safari, iOS, iPadOS, tvOS, and watchOS, fixed in versions 15 and 8 respectively. This high-severity flaw (CVSS 8.8) allows remote attackers to achieve arbitrary code execution by tricking users into processing maliciously crafted web content. While no public exploits or active exploitation have been observed, and community discussion is minimal, the potential for significant impact remains due to the nature of the vulnerability.

Impacted Technologies

VendorProductVersion(s)CPE
< 15.0CPE matchmatch criteria
cpe:2.3:a:apple:safari:*:*:*:*:*:*:*:*
< 15.0CPE matchmatch criteria
cpe:2.3:o:apple:ipados:*:*:*:*:*:*:*:*
< 15.0CPE matchmatch criteria
cpe:2.3:o:apple:iphone_os:*:*:*:*:*:*:*:*
< 12.0.1CPE matchmatch criteria
cpe:2.3:o:apple:macos:*:*:*:*:*:*:*:*
< 15.0CPE matchmatch criteria
cpe:2.3:o:apple:tvos:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

8.8HIGH

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
2.8
Impact Score
5.9
CvssVersion
3.1

Exploit Intelligence

EPSS Score
1.41%
Probability of exploitation in next 30 days
EPSS Percentile
69.8%
Percentile rank of EPSS score among Peer Group
As of 2026-07-28
Model: v2026.06.15
This CVE's current EPSS score of 0.0140 is in the 68th percentile among its peer group of 14,875 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.2 Bluesky, 0.1 Mastodon, and 0.2 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.1 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (3)

redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 7 Extended Lifecycle SupportFixed in: webkitgtk4-0:2.48.3-2.el7_9
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 8Fixed in: webkit2gtk3-0:2.34.6-1.el8
View patch
applevendor investigatingvia nvd_reference
View patch

Vendor Advisories (1)

redhatCVE-2021-30809Moderate

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

Dec 20, 2021

References

support.apple.com / en-us/HT212814
Release NotesVendor Advisory
support.apple.com / en-us/HT212815
Release NotesVendor Advisory
support.apple.com / en-us/HT212816
Release NotesVendor Advisory
support.apple.com / en-us/HT212819
Release NotesVendor Advisory
support.apple.com / kb/HT212869
Vendor Advisory
openwall.com / lists/oss-security/2021/12/20/6
Mailing ListThird Party Advisory