CVE-2021-33600

A denial-of-service (DoS) vulnerability was discovered in the web user interface of F-Secure Internet Gatekeeper. The vulnerability occurs because of an attacker can trigger assertion via malformed HTTP packet to web interface. An unauthenticated attacker could exploit this vulnerability by sending a large username parameter. A successful exploitation could lead to a denial-of-service of the product.

This issue and a proof-of-concept exploit was reported privately to F-Secure as part of our Vulnerability Reward Program. No known attacks have been reported or observed in the wild.