#VU63007 Input validation error in cURL

Published: 2022-05-11

Vulnerability identifier: #VU63007

Vulnerability risk: Low

CVSSv3.1: 3.8 [CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2022-27780


Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Client/Desktop applications / Other client software

Vendor: curl.haxx.se


The vulnerability allows a remote attacker to bypass filters and checks.

The vulnerability exists due to the curl URL parser wrongly accepts percent-encoded URL separators like '/' when decoding the host name part of a URL, making it a different URL using the wrong host name when it is later retrieved. For example, the URL like http://example.com%2F10.0.0.1/, would be allowed by the parser and get transposed into http://example.com/

A remote attacker can bypass various internal filters and checks and force the curl to connect to a wrong web application.

Install updates from vendor's website.

Vulnerable software versions

cURL: 7.80.0 - 7.83.0

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