CVE-2021-30666

HIGH KEV

iOS <12.5.3 - RCE

Title source: llm

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..

References (2)

[Release Notes, Vendor Advisory] https://support.apple.com/en-us/HT212341

[Third Party Advisory, US Government Resource] https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-30666

Scores

CVSS v3 8.8

EPSS 0.0147

EPSS Percentile 81.0%

Attack Vector NETWORK

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

Details

CISA KEV 2021-11-03

VulnCheck KEV 2021-05-03

InTheWild.io 2021-05-03

ENISA EUVD EUVD-2021-17583

CWE

CWE-119

Status published

Products (1)

apple/iphone_os < 12.5.3

Published Sep 08, 2021

KEV Added Nov 03, 2021

Tracked Since Feb 18, 2026