What’s Vulnerable › Vulnerabilities

CVE-2021-33602: Denial-of-Service (DoS) Vulnerability

• Severity: medium (CVSS 5.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.6% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2021-10-06 · updated 2026-06-17

Description

A vulnerability affecting the F-Secure Antivirus engine was discovered when the engine tries to unpack a zip archive (LZW decompression method), and this can crash the scanning engine. The vulnerability can be exploited 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: all versions
• F-Secure Internet Gatekeeper: all versions
• F-Secure Linux Security: all versions

References

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

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