CVE-2021-30666highunder attackCWE-119

CVE-2021-30666: high-severity vulnerability in Apple iOS

Published · Updated

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51Vexday Risk Score

Prioritize patching. It under exploitation confirmed by CISA.

ssvc Actcvss 8.8epss 3.0%
from disclosure to weapon
Published on NVDSep 8
CISA KEV+56d
What the vendors declare (VEX)

Official vendor statements in CSAF/VEX format: whether their product is affected, already fixed, or ruled out — and why. These are the vendor's assertions, not Vexday's judgment.

Red HatVEX document ↗
Affected
2 products (9 components)
Red Hat Enterprise Linux 7 · Red Hat Enterprise Linux 6
none_available: Affected
Fixed
11 products (366 components)
Red Hat Enterprise Linux AppStream (v. 8) · Red Hat Enterprise Linux Client (v. 7) · Red Hat Enterprise Linux Client Optional (v. 7) · Red Hat Enterprise Linux ComputeNode (v. 7) · Red Hat Enterprise Linux ComputeNode Optional (v. 7) · and others 6
fix ↗
Not affected
4 products (1,153 components) — because the vulnerable code is not present in the product
Red Hat Enterprise Linux AppStream (v. 8) · Red Hat CodeReady Linux Builder (v. 8) · Red Hat Enterprise Linux BaseOS (v. 8) · Red Hat Enterprise Linux 9
Action required by CISAfederal deadline: 2021-11-17

Apply updates per vendor instructions.

In short

A memory error in web content processing allowed attackers to run malicious code on iPhones and iPads. This flaw was actively being exploited before Apple fixed it in iOS 12.5.3.

Technical detail

Buffer overflow vulnerability in web content handler with CWE-119 (improper memory restriction) enabling arbitrary code execution. Attack vector is remote via maliciously crafted web content; pre-condition requires user to visit attacker-controlled or compromised website. Fixed through improved memory handling in iOS 12.5.3.

Summary generated and translated by AI from the official description.

The full analysis of this CVE is available in Portuguese →

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..
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Affected products
Apple · iOS
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