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CVE-2021-30952

HIGH
7.8
CVSS Score
Published: August 24, 2021 at 06:50 PM UTC
Updated: June 17, 2026 at 03:51 AM UTC
10 products affected across 5 vendorsmacOSDebian LinuxFedora

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Severity
HIGH7.8
Exploitation
CISA KEV
Exploit prediction
EPSS 7%
SSVC
Active

Actively Exploited

CISA Known Exploited Vulnerabilities (KEV) Catalog

EPSS Score7.0%

EPSS (Exploit Prediction Scoring System) estimates a 7.0% chance this CVE is exploited in the wild within the next 30 days — higher than 94% of all CVEs. It complements CVSS: a high EPSS on a mid-severity CVE can still be urgent.

Apple tvOS, macOS, Safari, iPadOS and watchOS contain an integer overflow or wraparound vulnerability due to the processing of maliciously crafted web content that may lead to arbitrary code execution.

Required Action
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
Ransomware Use
Unknown
Added to KEV
Mar 5, 2026
Remediation Due
Mar 26, 2026
217 days overdue
Notes
https://support.apple.com/en-us/HT212975
https://support.apple.com/en-us/HT212976
https://support.apple.com/en-us/HT212978
https://support.apple.com/en-us/HT212980
https://support.apple.com/en-us/HT212982
https://nvd.nist.gov/vuln/detail/CVE-2021-30952

Description

An integer overflow was addressed with improved input validation. This issue is fixed in tvOS 15.2, macOS Monterey 12.1, Safari 15.2, iOS 15.2 and iPadOS 15.2, watchOS 8.3. Processing maliciously crafted web content may lead to arbitrary code execution.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

iPadOS· Apple
95%
v < 15.2
Affected range stops below 15.2, so it looks safe — our inference, not a vendor statement
iPhone OS· Apple
95%
v < 15.2
Affected range stops below 15.2, so it looks safe — our inference, not a vendor statement
macOS· Apple
95%
v < 12.1v < 15.212.0 ≤ v < 12.1
Affected range stops below 12.1, so it looks safe — our inference, not a vendor statement
Affected range stops below 15.2, so it looks safe — our inference, not a vendor statement
Safari· Apple
95%
v < 15.2
Affected range stops below 15.2, so it looks safe — our inference, not a vendor statement
tvOS· Apple
95%
v < 15.2
Affected range stops below 15.2, so it looks safe — our inference, not a vendor statement
watchOS· Apple
95%
v < 8.3
Affected range stops below 8.3, so it looks safe — our inference, not a vendor statement
Debian Linux· Debiandrupal
95%
10.011.0
Fedora· Fedora Projectrpm
95%
3435
WebKitGTK· Webkitgtk
95%
v < 2.34.4
Wpewebkit· Wpewebkit
95%
v < 2.34.4

References (12)

Mailing Listx_refsource_MLISTThird Party Advisory
Source: [email protected]
http://www.openwall.com/lists/oss-security/2022/01/21/2
Vendor Advisoryx_refsource_FEDORABroken Link
Source: [email protected]
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/7EQVZ3CEMTINLBZ7PBC7WRXVEVCRHNSM/
Vendor Advisoryx_refsource_FEDORABroken Link
Source: [email protected]
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/HQKWD4BXRDD2YGR5AVU7H5J5PIQIEU6V/
x_refsource_MISCRelease NotesVendor Advisory
Source: [email protected]
https://support.apple.com/en-us/HT212975
x_refsource_MISCRelease NotesVendor Advisory
Source: [email protected]
https://support.apple.com/en-us/HT212976
x_refsource_MISCRelease NotesVendor Advisory
Source: [email protected]
https://support.apple.com/en-us/HT212978
x_refsource_MISCRelease NotesVendor Advisory
Source: [email protected]
https://support.apple.com/en-us/HT212980
x_refsource_MISCRelease NotesVendor Advisory
Source: [email protected]
https://support.apple.com/en-us/HT212982

SSVC — Action Prioritization

SSVCActiveNot automatableTotal impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

7.8HIGH[email protected]
Attack Vector
LOCAL
Complexity
LOW
Privileges
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
HIGH
Vector?

Quick Info

StatusANALYZED
CWE
CWE-190

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