Apple Safari up to 14.1.2 WebKit memory corruption

Summaryinfo

A vulnerability identified as critical has been detected in Apple Safari up to 14.1.2. The impacted element is an unknown function of the component WebKit. This manipulation causes memory corruption. This vulnerability is tracked as CVE-2021-30851. The attack is possible to be carried out remotely. No exploit exists. You should upgrade the affected component.

Detailsinfo

A vulnerability was found in Apple Safari up to 14.1.2 (Web Browser). It has been declared as critical. Affected by this vulnerability is some unknown functionality of the component WebKit. The manipulation with an unknown input leads to a memory corruption vulnerability. The CWE definition for the vulnerability is CWE-119. The product performs operations on a memory buffer, but it can read from or write to a memory location that is outside of the intended boundary of the buffer. As an impact it is known to affect confidentiality, integrity, and availability.

The weakness was disclosed 09/20/2021 by Samuel Gross as HT212816 as confirmed advisory (Website). The advisory is shared at support.apple.com. This vulnerability is known as CVE-2021-30851. It demands that the victim is doing some kind of user interaction. Neither technical details nor an exploit are publicly available. The price for an exploit might be around USD $0-$5k at the moment (estimation calculated on 05/22/2025). The advisory points out:

Processing maliciously crafted web content may lead to code execution

The vulnerability scanner Nessus provides a plugin with the ID 236537 (Alibaba Cloud Linux 3 : 0162: webkit2gtk3 (ALINUX3-SA-2022:0162)), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 15.0 eliminates this vulnerability. A possible mitigation has been published immediately after the disclosure of the vulnerability. The advisory contains the following remark:

A memory corruption vulnerability was addressed with improved locking.

The vulnerability is also documented in the vulnerability database at Tenable (236537). If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Productinfo

Type

• Web Browser

Vendor

• Apple

Name

• Safari

Version

• 14.1.0
• 14.1.1
• 14.1.2

License

• commercial

Website

• Vendor: https://www.apple.com/

CPE 2.3info

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CPE 2.2info

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If you want to get the best quality for vulnerability data then you always have to consider VulDB.

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