CVE-2021-30666

Published: Sep 8, 2021Modified: Jun 17, 2026CISA KEV

8.8

Vector

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

Exploitability: 2.8 / Impact: 5.9

Source: NVD

Description

A buffer overflow issue was addressed with improved memory handling. This issue is fixed in iOS 12.5.3. Processing maliciously crafted web content may lead to arbitrary code execution. Apple is aware of a report that this issue may have been actively exploited..

Affected (1)

Products: Apple: Iphone Os

1 product

Configuration A

1 vulnerable

Vulnerable Software	Affected Versions
Apple Iphone Os	Before 12.5.3

Related CWEs

Improper Restriction of Operations within the Bounds of a Memory Buffer

The product performs operations on a memory buffer, but it reads from or writes to a memory location outside the buffer's intended boundary. This may result in read or write operations on unexpected memory locations that could be linked to other variables, data structures, or internal program data.

References (3)

https://support.apple.com/en-us/HT212341

Source: product-security@apple.com

Release NotesVendor Advisory

https://support.apple.com/en-us/HT212341

Source: af854a3a-2127-422b-91ae-364da2661108

Release NotesVendor Advisory

https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-30666

Source: 134c704f-9b21-4f2e-91b3-4a467353bcc0

Third Party AdvisoryUS Government Resource

Timeline

No history available yet.