High severity · published Aug 24, 2021
CVE-2021-30952
Apple Multiple Products Integer Overflow or Wraparound Vulnerability
In wildKEV
7.8
CVSS
7%
EPSS
Yes
On KEV
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.
CVSS vector
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Attack vector
Local
Complexity
Low
Privileges
None
User interaction
Required
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)7.0% · higher than 94% of CVEs
Exploited in the wildYes
CISA KEVListed Mar 5, 2026
Federal remediation dueMar 26, 2026
Ransomware campaign useNot known
Affected products
Which versions
MA
macOS · Apple
before 12.1; before 15.2; before 15.2 · source: vendor, NVD
IO
iOS · Apple
before 15.2 · source: NVD
IA
iOS and iPadOS · Apple
before 15.2 · source: vendor
WA
watchOS · Apple
before 8.3 · source: vendor, NVD
DL
Debian Linux · Debian
10.0; 11.0 · source: NVD
FE
Fedora · Fedoraproject
34; 35 · source: NVD
SA
Safari · Apple
before 15.2 · source: NVD
TV
Tvos · Apple
before 15.2 · source: NVD
WE
Webkitgtk · Webkitgtk
before 2.34.4 · source: NVD
WW
Wpe Webkit · Wpewebkit
before 2.34.4 · source: NVD
MP
Multiple Products · Apple
All versions, or not specified · source: KEV
In the news
VulnerabilityHigh
CISA Adds Five Known Exploited Vulnerabilities to Catalog
CISA has added five new vulnerabilities to its Known Exploited Vulnerabilities (KEV) Catalog , based on evidence of active exploitation.
CVE-2017-7921 Hikvision Multiple Products Improper Authentication Vulnerability
CVE-2021-22681 Rockwell Multiple Products Insufficient Protected Credentials Vulnerability
CVE-2021-30952 Apple Multiple Products Integer Overflow or Wraparound Vulnerability
CVE-2023-41974 Apple iOS and iPadOS Use-After-Free Vulnerability
CVE-2023-43000 Apple Multiple products Use-After-Free Vulnerability
These types of vulnerabilities are frequent attack vectors for malicious cyber actors and pose significant risks to the federal enterprise.
Binding Operational Directive (BOD) 22-01: Reducing the Significant Risk of Known Exploited Vulnerabilities established the KEV Catalog as a living list of known Common Vulnerabilities and Exposures (CVEs) that carry significant risk to the federal enterprise. BOD 22-01 requires Federal Civilian Executive Branch (FCEB) agencies to remediate identified vulnerabilities by the due date to protect FCEB networks against active threats. See the BOD 22-01 Fact Sheet for more information.
Although BOD 22-01 only applies to FCEB agencies, CISA strongly urges all organizations to reduce their exposure to cyberattacks by prioritizing timely remediation of KEV Catalog vulnerabilities as part of their vulnerability management practice. CISA will continue to add vulnerabilities to the catalog that mee...
Mar 5, 2026·CISA Advisories
VulnerabilityHigh
[CISA KEV] CVE-2021-30952: Apple Multiple Products - Apple Multiple Products Integer Overflow or Wraparound Vulnerability
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.
MPMultiple ProductsCVE-2021-30952
Mar 5, 2026·CISA KEV
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2021-30952
CVE.org
https://www.cve.org/CVERecord?id=CVE-2021-30952
CISA KEV catalogue
https://www.cisa.gov/known-exploited-vulnerabilities-catalog
x_refsource_MISC
https://support.apple.com/en-us/HT212975
x_refsource_MISC
https://support.apple.com/en-us/HT212976
x_refsource_MISC
https://support.apple.com/en-us/HT212978
x_refsource_MISC
https://support.apple.com/en-us/HT212980
x_refsource_MISC
https://support.apple.com/en-us/HT212982
mailing-list
http://www.openwall.com/lists/oss-security/2022/01/21/2
More from macOS
10.0
CVE-2025-43300
Apple iOS, iPadOS, and macOS Out-of-Bounds Write Vulnerability
10.0
CVE-2025-24201
Apple Multiple Products WebKit Out-of-Bounds Write Vulnerability
10.0
CVE-2025-24085
Apple Multiple Products Use-After-Free Vulnerability
9.8
CVE-2026-65400
Apple macOS Improper Authentication Vulnerability
9.8
CVE-2025-31200
Apple Multiple Products Memory Corruption Vulnerability
