Embedded malicious code (backdoor) in UAParser.js - CVE-2021-4229
Published: October 26, 2021 / Updated: March 23, 2023
Vulnerability identifier: #VU57636
CSH Severity: High
CVSS v4: 9.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2021-4229
CWE-ID: CWE-506
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to gain unauthorized access to the application.
The vulnerability exists due to presence of embedded malicious functionality in the application code (aka backdoor) that allows a remote attacker to gain unauthorized access to the application.
Affected software
UAParser.js
How to mitigate CVE-2021-4229
Install updates from vendor's website.
UAParser.js - addressed in versions 0.7.30, 0.8.1, 1.0.1