CVE-2020-12619

MediumCVSS 5.9/10Last modified Jun 17, 2026

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.

Metrics

CVSS 3.1 5.9/10CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N

Affected software

Vendor	Product	Versions
n/a	n/a	n/a

References

https://updates.mailmate-app.com/2.0/release_notesRelease Notes, Vendor Advisory
https://www.nds.ruhr-uni-bochum.de/media/nds/veroeffentlichungen/2020/08/15/mailto-paper.pdfThird Party Advisory
https://updates.mailmate-app.com/2.0/release_notesRelease Notes, Vendor Advisory
https://www.nds.ruhr-uni-bochum.de/media/nds/veroeffentlichungen/2020/08/15/mailto-paper.pdfThird Party Advisory

Timeline

Published: Aug 20, 2020
Last modified: Jun 17, 2026
NVD status: Modified

Related CVEs from 2020

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