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CVE-2009-3766

19
FAUCET Score

CVE-2009-3766 describes a critical vulnerability in Mutt versions prior to 1.5.19, specifically when integrated with OpenSSL. The flaw allows man-in-the-middle attackers to spoof SSL servers because Mutt fails to properly validate the domain name in the Common Name field of an X.509 certificate. This vulnerability carries a CVSS score of 6.8, indicating a medium severity risk with network-based attacks and medium complexity, potentially leading to partial compromise of confidentiality, integrity, and availability. There is no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
>= 1.5.16, < 1.5.19CPE matchmatch criteria
cpe:2.3:a:mutt:mutt:*:*:*:*:*:*:*:*

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
1.14%
Probability of exploitation in next 30 days
EPSS Percentile
63.3%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0114 is in the 26th 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 Patches (2)

redhatend of lifevia redhat_api
Product: Red Hat Enterprise Linux 4Fixed in: mutt
redhatend of lifevia redhat_api
Product: Red Hat Enterprise Linux 5Fixed in: mutt

Vendor Advisories (1)

redhatCVE-2009-3766Moderate

mutt: missing host name vs. SSL certificate name checks

Aug 10, 2009

References

dev.mutt.org / trac/ticket/3087
PatchVendor Advisory
marc.info
Mailing ListThird Party Advisory
openwall.com / lists/oss-security/2009/10/26/1
Mailing ListThird Party Advisory