CVE-2021-33602: F-Secure Atlant

Medium severity, CVSS 5.3. EPSS: 0.6% chance of exploitation in the next 30 days.

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 Atlant: any version
• F-Secure Cloud Protection: any version
• F-Secure Internet Gatekeeper: any version
• F-Secure Linux Security: any version

Published 2021-10-06. Last modified 2026-06-17.