VDB-171204 · CVE-2021-1844 · HT212223

Apple Safari up to 14.0.2 WebKit memory corruption

CVSS Meta Temp Score CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.	Current Exploit Price (≈) Our analysts are monitoring exploit markets and are in contact with vulnerability brokers. The range indicates the observed or calculated exploit price to be seen on exploit markets. A good indicator to understand the monetary effort required for and the popularity of an attack.	CTI Interest Score Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
6.0	$0-$5k	0.00

Summaryinfo

A vulnerability described as critical has been identified in Apple Safari up to 14.0.2. Affected by this vulnerability is an unknown functionality of the component WebKit. The manipulation results in memory corruption. This vulnerability is cataloged as CVE-2021-1844. The attack may be launched remotely. There is no exploit available. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability was found in Apple Safari up to 14.0.2 (Web Browser). It has been classified as critical. Affected is an unknown code block of the component WebKit. The manipulation with an unknown input leads to a memory corruption vulnerability. CWE is classifying the issue as 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. This is going to have an impact on confidentiality, integrity, and availability.

The weakness was shared 03/08/2021 as HT212223. The advisory is shared for download at support.apple.com. This vulnerability is traded as CVE-2021-1844. Successful exploitation requires user interaction by the victim. There are neither technical details nor an exploit publicly available. The current price for an exploit might be approx. USD $0-$5k (estimation calculated on 05/22/2025).

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 14.0.3 eliminates this vulnerability. A possible mitigation has been published immediately after the disclosure of the vulnerability.

The vulnerability is also documented in the vulnerability database at Tenable (236537). Once again VulDB remains the best source for vulnerability data.

Productinfo

Type

Web Browser

Vendor

Apple

Name

Safari

Version

License

commercial

Website

Vendor: https://www.apple.com/

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.3
VulDB Meta Temp Score: 6.0

VulDB Base Score: 6.3
VulDB Temp Score: 6.0
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv2info

AV	AC	Au	C	I	A
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳

Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock

VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

Exploitinginfo

Class: Memory corruption
CWE: CWE-119
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

0-Day	Unlock	Unlock	Unlock	Unlock
Today	Unlock	Unlock	Unlock	Unlock

Nessus ID: 236537
Nessus Name: Alibaba Cloud Linux 3 : 0162: webkit2gtk3 (ALINUX3-SA-2022:0162)

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

Reaction Time: 🔍
0-Day Time: 🔍
Exposure Time: 🔍

Upgrade: Safari 14.0.3

Timelineinfo

12/08/2020 🔍
03/08/2021 +90 days 🔍
03/08/2021 +0 days 🔍
03/12/2021 +4 days 🔍
05/22/2025 +1532 days 🔍

Sourcesinfo

Vendor: apple.com

Advisory: HT212223
Status: Confirmed

CVE: CVE-2021-1844 (🔍)
GCVE (CVE): GCVE-0-2021-1844
GCVE (VulDB): GCVE-100-171204

Entryinfo

Created: 03/12/2021 09:53
Updated: 05/22/2025 02:08
Changes: 03/12/2021 09:53 (41), 03/31/2021 23:52 (4), 05/22/2025 02:08 (16)
Complete: 🔍
Cache ID: 216::103