CVE-2021-30809

A use after free issue was addressed with improved memory management. This issue is fixed in Safari 15, tvOS 15, watchOS 8, iOS 15 and iPadOS 15. Processing maliciously crafted web content may lead to arbitrary code execution.

Affected

Apple · iOS and iPadOS · tvOS · Safari · watchOS

CVSS v3.1 NVD

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

1.51% chance of exploitation in the next 30 days, 74th percentile

Published

2021-10-28

Updated

2024-08-03

Proof-of-concept exploits (2)

• seregonwar/CVE-2021-30809-UAF4★ · 2025-08-10
• seregonwar/CVE-2021-30809-OOM4★ · 2025-08-10

Security advisories

• https://support.apple.com/en-us/HT212814
• https://support.apple.com/en-us/HT212815
• https://support.apple.com/en-us/HT212816
• https://support.apple.com/en-us/HT212819
• https://support.apple.com/kb/HT212869
• http://www.openwall.com/lists/oss-security/2021/12/20/6

References

• CVE Record
• NVD entry

Related

• CVE-2023-28205