Inconsistent interpretation of HTTP requests in October CMS - CVE-2021-21265
Published: March 10, 2021
Vulnerability identifier: #VU51380
CSH Severity: Medium
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2021-21265
CWE-ID: CWE-444
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: OctoberCMS
Affected software:
October CMS
October CMS
Detailed vulnerability description
The vulnerability allows a remote attacker to preform HTTP request smuggling attacks.
The vulnerability exists due to improper validation of HTTP requests. If the server is configured to accept requests with arbitrary HOST header, a remote attacker can send a specially crafted HTTP request to the server and smuggle arbitrary HTTP headers into the request.
Successful exploitation of vulnerability may allow an attacker to poison HTTP cache and perform phishing attacks.
How to mitigate CVE-2021-21265
Install updates from vendor's website and configure the CMS to accept only trusted host names.