#VU66616 Incorrect Regular Expression in browserslist - CVE-2021-23364

Vulnerability identifier: #VU66616

Vulnerability risk: Medium

CVSSv4.0: 2.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2021-23364

CWE-ID: CWE-185

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
browserslist
Other software / Other software solutions

Vendor: Browserslist

Description

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to insufficient input validation when processing regular expressions. A remote attacker can pass specially crafted data to the application and perform regular expression denial of service (ReDos) attack.

Mitigation
Install update from vendor's website.

Vulnerable software versions

browserslist: 4.0.0 - 4.16.4

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External links
https://snyk.io/vuln/SNYK-JAVA-ORGWEBJARSNPM-1277182
https://github.com/browserslist/browserslist/commit/c091916910dfe0b5fd61caad96083c6709b02d98
https://github.com/browserslist/browserslist/pull/593
https://github.com/browserslist/browserslist/blob/e82f32d1d4100d6bc79ea0b6b6a2d281a561e33c/index.js%23L472-L474
https://snyk.io/vuln/SNYK-JS-BROWSERSLIST-1090194

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.