What’s Vulnerable › Vulnerabilities

CVE-2021-33599: Denial-of-Service (DoS) Vulnerability

• Severity: medium (CVSS 5.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2021-09-07 · updated 2026-06-17
• Weakness: CWE-835

Description

A vulnerability affecting F-Secure Antivirus engine was discovered whereby scanning WIM archive file can lead to denial-of-service (infinite loop and freezes AV engine scanner). The vulnerability can be exploit remotely by an attacker. A successful attack will result in Denial-of-Service of the Anti-Virus engine.

Affected products

• F-Secure All F-Secure Endpoint Protection products on Windows and Mac F-Secure Linux Security (32-bit) F-Secure Linux Se: all versions
• F-Secure Cloud Protection For Salesforce: all versions
• F-Secure and WithSecure All F-Secure and WithSecure Endpoint Protection Products for Windows: all versions
• F-Secure Linux Security: all versions

References

• 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-2021-33599
• 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-2021-33599

Get alerted when CVE-2021-33599 or the next vulnerability affects your stack