CVE-2020-12618: Emclient Em Client

Medium severity, CVSS 4.8. EPSS: 0.3% chance of exploitation in the next 30 days.

eM Client before 7.2.33412.0 automatically imported S/MIME certificates and thereby silently replaced existing ones. This allowed a man-in-the-middle attacker to obtain an email-validated S/MIME certificate from a trusted CA and replace the public key of the entity to be impersonated. This enabled the attacker to decipher further communication. The entire attack could be accomplished by sending a single email.

Affected products

• Emclient Em Client: before 7.2.33412.0 (fixed in 7.2.33412.0)

Published 2020-08-20. Last modified 2026-06-17.