CVE-2023-47263: Withsecure Atlant

High severity, CVSS 7.5. EPSS: 0.7% chance of exploitation in the next 30 days.

Certain WithSecure products allow a Denial of Service (DoS) in the antivirus engine when scanning a fuzzed PE32 file. This affects WithSecure Client Security 15, WithSecure Server Security 15, WithSecure Email and Server Security 15, WithSecure Elements Endpoint Protection 17 and later, WithSecure Client Security for Mac 15, WithSecure Elements Endpoint Protection for Mac 17 and later, WithSecure Linux Security 64 12.0, WithSecure Linux Protection 12.0, and WithSecure Atlant (formerly F-Secure Atlant) 15 and later.

Affected products

• Withsecure Atlant: from 15.0
• Withsecure Client Security: version 15 only
• Withsecure Elements Endpoint Protection: from 17
• Withsecure Email And Server Security: version 15 only
• Withsecure Linux Protection: version 12.0 only
• Withsecure Linux Security 64: version 12.0 only
• Withsecure Server Security: version 15 only

Published 2023-11-16. Last modified 2026-06-17.