#VU63698 Incorrect Regular Expression in normalize-url - CVE-2021-33502

Vulnerability identifier: #VU63698

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-2021-33502

CWE-ID: CWE-185

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
normalize-url
Web applications / JS libraries

Vendor: Sindre Sorhus

Description

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

The vulnerability exists due to exponential performance for data. A remote attacker can pass specially crafted data to the application and perform a regular expression denial of service (ReDos) attack.

Mitigation
Cybersecurity Help is currently unaware of any official solution to address this vulnerability..

Vulnerable software versions

normalize-url: 4.5.0, 5.0.0, 5.1.0, 5.2.0 - 5.2.1, 5.3.0, 6.0.0

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External links
https://github.com/sindresorhus/normalize-url/releases/tag/v6.0.1
https://security.netapp.com/advisory/ntap-20210706-0001/

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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.