#VU59233 Inconsistent interpretation of HTTP requests in llhttp

Published: 2022-01-05

Vulnerability identifier: #VU59233

Vulnerability risk: Medium

CVSSv3.1: 5.3 [CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2021-22959


Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Web applications / Modules and components for CMS

Vendor: Node.js Foundation


The vulnerability allows a remote attacker to preform HTTP request smuggling attacks.

The vulnerability exists due to improper validation of HTTP requests, where the application accepts requests with a space right after the header name before the colon. A remote attacker can send a specially crafted HTTP request to the server and smuggle arbitrary HTTP headers.

Successful exploitation of vulnerability may allow an attacker to poison HTTP cache and perform phishing attacks.

Install updates from vendor's website.

Vulnerable software versions

llhttp: 6.0.0 - 6.0.5, 5.1.0, 5.0.0, 4.1.0 - 4.1.1, 4.0.0, 3.0.0 - 3.0.1, 2.2.0 - 2.2.1, 2.1.0 - 2.1.3, 2.0.0 - 2.0.5, 1.1.0 - 1.1.4, 1.0.1

External links

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.

Latest bulletins with this vulnerability