CVE-2021-30762

2021-09-0800:00:00

attackerkb.com

6.8 Medium

CVSS2

Attack Vector

NETWORK

Attack Complexity

MEDIUM

Authentication

NONE

Confidentiality Impact

PARTIAL

Integrity Impact

PARTIAL

Availability Impact

PARTIAL

AV:N/AC:M/Au:N/C:P/I:P/A:P

8.8 High

CVSS3

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

REQUIRED

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

HIGH

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

0.005 Low

EPSS

Percentile

77.6%

JSON

A use after free issue was addressed with improved memory 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…

Recent assessments:

gwillcox-r7 at June 21, 2021 7:27pm UTC reported:

From what I can tell this is a UAF vulnerability in WebKit. WebKit vulns are commonly exploited in the wild and this one is no exception with <https://support.apple.com/en-us/HT212548> noting that active exploitation in the wild has been discovered. It is a little odd that the patched version is noted as version 12.5.4 of iOS given the latest version is 14.6, but if you are still running on the 12.x branch, make sure to update to 12.5.4 to receive the patches for this vulnerability, particularly given it has a working exploit in the wild. This was likely used alongside the WebKit memory corruption vulnerability (see <https://attackerkb.com/topics/DwxtgSIUAV/cve-2021-30761>) that was patched in the same release to form a full working exploit against iOS devices.

Assessed Attacker Value: 4
Assessed Attacker Value: 4Assessed Attacker Value: 2