#VU68281 Incorrect Regular Expression in validator.js - CVE-2021-3765

Vulnerability identifier: #VU68281

Vulnerability risk: Medium

CVSSv4.0: 6.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2021-3765

CWE-ID: CWE-185

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
validator.js
Web applications / JS libraries

Vendor: validatorjs

Description

The vulnerability allows a remote attacker to perform a regular expression denial of service (ReDoS) attack.

The vulnerability exists due to improper input validation when handling user-supplied input. A remote attacker can pass specially crafted data to the application and perform a regular expression denial of service (ReDoS) attack.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

validator.js: 0.5.0 - 13.6.1

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External links
https://huntr.dev/bounties/c37e975c-21a3-4c5f-9b57-04d63b28cfc9
https://github.com/validatorjs/validator.js/commit/496fc8b2a7f5997acaaec33cc44d0b8dba5fb5e1

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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.