HOMEVULNERABILITIESCVE-2020-12618
MEDIUM

CVE-2020-12618

NVD-CWE-noinfoPublished: August 20, 2020· Updated: Jun 17, 2026

4.8
CVSS v3.1

Official Description

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.

NVD Source

Technical Analysis

CVE-2020-12618 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorNetwork
Attack ComplexityHigh
Privileges Req.None
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityLow
IntegrityLow
AvailabilityNone
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N

Affected Vendors & Products

emclient1 product(s)
em client
Source: NVD CPE · 1 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

ADVISORYhttps://www.emclient.com/release-history
ADVISORYhttps://www.nds.ruhr-uni-bochum.de/media/nds/veroeffentlichungen/2020/08/15/mailto-paper.pdf
ADVISORYhttps://www.emclient.com/release-history
ADVISORYhttps://www.nds.ruhr-uni-bochum.de/media/nds/veroeffentlichungen/2020/08/15/mailto-paper.pdf

All References (4)

→
https://www.emclient.com/release-historyRelease Notes · Vendor Advisory
→
https://www.nds.ruhr-uni-bochum.de/media/nds/veroeffentlichungen/2020/08/15/mailto-paper.pdfThird Party Advisory
→
https://www.emclient.com/release-historyRelease Notes · Vendor Advisory
→
https://www.nds.ruhr-uni-bochum.de/media/nds/veroeffentlichungen/2020/08/15/mailto-paper.pdfThird Party Advisory

Quick Facts

CVE IDCVE-2020-12618
CVSS Score4.8 / 10
SeverityMEDIUM
WeaknessNVD-CWE-noinfo
CISA KEVNo
Affected1 vendor(s)
PublishedAug 20, 2020

Related CVEs (NVD-CWE-noinfo)

CVE-2015-0347
10.0
CVE-2015-0352
10.0
CVE-2014-7876
10.0
CVE-2015-0117
10.0
CVE-2015-0350
10.0
CVE-2015-0353
10.0

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2020-12618 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.
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