#VU56923 Input validation error in F-Secure Internet Gatekeeper - CVE-2021-33600

Vulnerability identifier: #VU56923

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-2021-33600

CWE-ID: CWE-20

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
F-Secure Internet Gatekeeper
Other software / Other software solutions

Vendor: F-Secure

Description

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

The vulnerability exists due to an assertion failure in the web user interface within the "usernameL parameter. A remote attacker can pass specially crafted input to the application and perform a denial of service (DoS) attack.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

F-Secure Internet Gatekeeper: 5

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External links
https://www.f-secure.com/en/business/programs/vulnerability-reward-program/hall-of-fame
https://www.f-secure.com/en/business/support-and-downloads/security-advisories/cve-2021-33600

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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.