CVE-2020-12619 json
MailMate before 1.11 automatically imported S/MIME certificates and thereby silently replaced existing ones.
published 2020-08-20 6 y ago modified 2026-06-17 4 mo ago also EUVD-2020-4920
- cvss
- 5.9
- version 3.1, NVD
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.4%
- EPSS 0.4% chance of exploitation in 30 days, percentile 37%
- public exploits
- 0
- none known
Summary
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.
Patch / fix
- freron mailmate 1.11
Exploit prediction
0.43% chance of exploitation in the next 30 days, higher than 37% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| NVD | 3.1 | 5.9 | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N |
| NVD | 2.0 | 4.3 | AV:N/AC:M/Au:N/C:N/I:P/A:N |
References
-
updates.mailmate-app.com
/2.0/release_notes
release-notes, vendor-advisory
-
nds.ruhr-uni-bochum.de
/media/nds/veroeffentlichungen/2020/08/15/mailto-paper.pdf
third-party-advisory
Sources
- CVE List CVE-2020-12619
- NVD CVE-2020-12619
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