#VU55850 Spoofing attack in F-Secure Safe Browser - CVE-2021-33594

Vulnerability identifier: #VU55850

Vulnerability risk: Medium

CVSSv4.0: 1 [CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2021-33594

CWE-ID: CWE-451

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
F-Secure Safe Browser
Client/Desktop applications / Antivirus software/Personal firewalls

Vendor: F-Secure

Description

The vulnerability allows a remote attacker to perform spoofing attack.

The vulnerability exists due to incorrect processing of user-supplied data. A remote attacker can trick a victim to click on a specially crafted URL and spoof page content. and performa a dneialof service conriion on the targe system.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

F-Secure Safe Browser: 18.3.0

---

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
https://www.f-secure.com/en/business/support-and-downloads/security-advisories/cve-2021-33594

---

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.