#VU64914 Incorrect Regular Expression in jquery-validation - CVE-2021-21252

Vulnerability identifier: #VU64914

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-2021-21252

CWE-ID: CWE-185

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
jquery-validation
Web applications / JS libraries

Vendor: jquery-validation

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

jquery-validation: 1.6.0 - 1.19.2

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External links
https://github.com/jquery-validation/jquery-validation/commit/5d8f29eef363d043a8fec4eb86d42cadb5fa5f7d
https://github.com/jquery-validation/jquery-validation/pull/2371
https://github.com/jquery-validation/jquery-validation/security/advisories/GHSA-jxwx-85vp-gvwm
https://security.netapp.com/advisory/ntap-20210219-0005/
https://www.npmjs.com/package/jquery-validation

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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.