CVE-2021-30761highunder attackCWE-787

CVE-2021-30761: high-severity vulnerability in Apple iOS

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56Vexday Risk Score

Prioritize patching. It under exploitation confirmed by CISA.

ssvc Actcvss 8.8epss 11%
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 flaw in how iOS 12.5.4 handles web content allows attackers to corrupt memory and run arbitrary code on your device. Simply visiting a malicious website can trigger this vulnerability, which Apple has confirmed is being actively exploited in the wild.

Technical detail

Memory corruption vulnerability (CWE-787 buffer overflow) in web content processing on iOS 12.5.4. Attack vector is remote via maliciously crafted web content; no user interaction beyond normal browsing is required. Successful exploitation leads to arbitrary code execution with device privileges.

Summary generated and translated by AI from the official description.

The full analysis of this CVE is available in Portuguese →

A memory corruption issue was addressed with improved state management. This issue is fixed in iOS 12.5.4. 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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