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CVE-2009-3765

20
FAUCET Score

CVE-2009-3765 describes a critical vulnerability in mutt versions 1.5.19 and 1.5.20 when utilizing OpenSSL. This flaw allows man-in-the-middle attackers to spoof SSL servers by exploiting improper handling of null characters in the Common Name field of X.509 certificates. The vulnerability has a CVSS score of 6.8, indicating a medium severity risk with a network-based attack vector, medium complexity, and potential for partial compromise of confidentiality, integrity, and availability. There is no evidence of active exploitation, public exploit code, or significant community discussion surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
1.5.19CPE matchmatch criteria
cpe:2.3:a:mutt:mutt:1.5.19:*:*:*:*:*:*:*
1.5.20CPE matchmatch criteria
cpe:2.3:a:mutt:mutt:1.5.20:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 2.0

6.8MEDIUM

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

Confidentiality Impact
PARTIAL
Integrity Impact
PARTIAL
Availability Impact
PARTIAL
Access Vector
NETWORK
Access Complexity
MEDIUM
Authentication
NONE
Exploitability Score
8.6
Impact Score
6.4
CvssVersion
2.0

Exploit Intelligence

EPSS Score
1.08%
Probability of exploitation in next 30 days
EPSS Percentile
61.8%
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 23rd percentile among its peer group of 19,958 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.0 Bluesky, 0.0 Mastodon, and 0.2 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-2009-3765Moderate

mutt: Doesn't properly handle NULL character in subject Common Name

Aug 11, 2009

References

dev.mutt.org / trac/changeset/6016:dc09812e63a3/mutt_ssl.c
lists.opensuse.org / opensuse-security-announce/2009-10/msg00001.html
marc.info
marc.info