CVE-2021-30952

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

Apple · watchOS · iOS and iPadOS · macOS

CVSS v3.1 NVD

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

CVSS v3.1 CNA

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

CVSS v2.0 NVD

6.8 MEDIUMAV:N/AC:M/Au:N/C:P/I:P/A:P

EPSS

6.96% chance of exploitation in the next 30 days, 94th percentile

CISA KEV

added 2026-03-05

Published

2021-08-24

Updated

2026-03-06

Proof-of-concept exploits (1)

• https://cloud.google.com/blog/topics/threat-intelligence/coruna-powerful-ios-exploit-kit

Security advisories

• 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
• http://www.openwall.com/lists/oss-security/2022/01/21/2
• https://www.debian.org/security/2022/dsa-5060
• https://www.debian.org/security/2022/dsa-5061

References

• CVE Record
• NVD entry