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CVE-2009-3941

17
FAUCET Score

CVE-2009-3941 describes a vulnerability in Martin Lambers mpop before version 1.0.19, specifically when OpenSSL is utilized. This flaw allows man-in-the-middle attackers to spoof SSL servers by exploiting how mpop handles null characters in domain names within X.509 certificate fields, a problem similar to CVE-2009-2408. With a CVSS score of 5.0, this vulnerability has a network attack vector and low attack complexity, potentially leading to information integrity compromise (P) without impacting confidentiality or availability. There is no evidence of active exploitation, no publicly available exploit code in Metasploit, Nuclei, or ExploitDB, and it has received minimal community discussion or media coverage.

Impacted Technologies

VendorProductVersion(s)CPE
<= 1.0.18CPE matchmatch criteria
cpe:2.3:a:martin_lambers:mpop:*:*:*:*:*:*:*:*
0.1.0CPE matchmatch criteria
cpe:2.3:a:martin_lambers:mpop:0.1.0:*:*:*:*:*:*:*
0.1.1CPE matchmatch criteria
cpe:2.3:a:martin_lambers:mpop:0.1.1:*:*:*:*:*:*:*
0.1.2CPE matchmatch criteria
cpe:2.3:a:martin_lambers:mpop:0.1.2:*:*:*:*:*:*:*
0.1.3CPE matchmatch criteria
cpe:2.3:a:martin_lambers:mpop:0.1.3:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 2.0

5.0MEDIUM

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

Confidentiality Impact
NONE
Integrity Impact
PARTIAL
Availability Impact
NONE
Access Vector
NETWORK
Access Complexity
LOW
Authentication
NONE
Exploitability Score
10.0
Impact Score
2.9
CvssVersion
2.0

Exploit Intelligence

EPSS Score
0.93%
Probability of exploitation in next 30 days
EPSS Percentile
56.9%
Percentile rank of EPSS score among Peer Group
As of 2026-07-28
Model: v2026.06.15
This CVE's current EPSS score of 0.0093 is in the 36th percentile among its peer group of 23,725 CVEs.

Social Chatter

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-2009-3941Moderate

mpop NULL character certificate flaw

Oct 24, 2009

References

mpop.sourceforge.net / news.html
Patch
secunia.com / advisories/37312
Vendor Advisory
vupen.com / english/advisories/2009/3225
PatchVendor Advisory