What’s Vulnerable › Vulnerabilities

CVE-2020-12619

• Severity: medium (CVSS 5.9 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: 2020-08-20 · updated 2026-06-17

Description

MailMate before 1.11 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

• Freron Mailmate: before 1.11 — fixed in 1.11

How to fix

Upgrade to a fixed version: Freron Mailmate 1.11. Check the vendor advisory for mitigations.

References

• https://updates.mailmate-app.com/2.0/release_notes
• https://www.nds.ruhr-uni-bochum.de/media/nds/veroeffentlichungen/2020/08/15/mailto-paper.pdf
• https://updates.mailmate-app.com/2.0/release_notes
• https://www.nds.ruhr-uni-bochum.de/media/nds/veroeffentlichungen/2020/08/15/mailto-paper.pdf

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