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CVE-2009-3942

17
FAUCET Score

CVE-2009-3942 describes a critical vulnerability in Martin Lambers msmtp versions prior to 1.4.19, specifically when using OpenSSL. This flaw allows man-in-the-middle attackers to spoof SSL servers by exploiting improper handling of null characters in X.509 certificate subject fields, similar to CVE-2009-2408. The vulnerability carries a CVSS score of 6.4, indicating a medium severity with low attack complexity, and could lead to information disclosure and integrity compromise. There is no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
<= 1.4.18CPE matchmatch criteria
cpe:2.3:a:martin_lambers:msmtp:*:*:*:*:*:*:*:*
0.2.5CPE matchmatch criteria
cpe:2.3:a:martin_lambers:msmtp:0.2.5:*:*:*:*:*:*:*
0.2.6CPE matchmatch criteria
cpe:2.3:a:martin_lambers:msmtp:0.2.6:*:*:*:*:*:*:*
0.3.0CPE matchmatch criteria
cpe:2.3:a:martin_lambers:msmtp:0.3.0:*:*:*:*:*:*:*
0.3.1CPE matchmatch criteria
cpe:2.3:a:martin_lambers:msmtp:0.3.1:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 2.0

6.4MEDIUM

AV:N/AC:L/Au:N/C:N/I:P/A:P

Confidentiality Impact
NONE
Integrity Impact
PARTIAL
Availability Impact
PARTIAL
Access Vector
NETWORK
Access Complexity
LOW
Authentication
NONE
Exploitability Score
10.0
Impact Score
4.9
CvssVersion
2.0

Exploit Intelligence

EPSS Score
1.08%
Probability of exploitation in next 30 days
EPSS Percentile
61.7%
Percentile rank of EPSS score among Peer Group
As of 2026-07-28
Model: v2026.06.15
This CVE's current EPSS score of 0.0108 is in the 39th percentile among its peer group of 23,725 CVEs.

Social Chatter

No social media mentions found for this CVE.

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.0 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Vendor Advisories (1)

redhatCVE-2009-3942Moderate

msmtp SSL NULL prefix flaw

Oct 24, 2009

References

lists.opensuse.org / opensuse-security-announce/2010-01/msg00007.html
msmtp.sourceforge.net / news.html
secunia.com / advisories/37321
Vendor Advisory
vupen.com / english/advisories/2009/3224
Vendor Advisory