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CVE-2009-2666

21
FAUCET Score

CVE-2009-2666 describes a critical vulnerability in fetchmail versions prior to 6.3.11, where a null character in an X.509 certificate's Common Name field allows man-in-the-middle attackers to spoof SSL servers. This vulnerability, similar to CVE-2009-2408, has a CVSS score of 6.4, indicating a medium severity with low attack complexity and potential for partial confidentiality and integrity compromise. There is no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage, suggesting low current attention.

Impacted Technologies

VendorProductVersion(s)CPE
<= 6.3.10CPE matchmatch criteria
cpe:2.3:a:fetchmail:fetchmail:*:*:*:*:*:*:*:*
4.5.1CPE matchmatch criteria
cpe:2.3:a:fetchmail:fetchmail:4.5.1:*:*:*:*:*:*:*
4.5.2CPE matchmatch criteria
cpe:2.3:a:fetchmail:fetchmail:4.5.2:*:*:*:*:*:*:*
4.5.3CPE matchmatch criteria
cpe:2.3:a:fetchmail:fetchmail:4.5.3:*:*:*:*:*:*:*
4.5.4CPE matchmatch criteria
cpe:2.3:a:fetchmail:fetchmail:4.5.4:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 2.0

6.4MEDIUM

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

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

Exploit Intelligence

EPSS Score
1.50%
Probability of exploitation in next 30 days
EPSS Percentile
71.6%
Percentile rank of EPSS score among Peer Group
As of 2026-07-25
Model: v2026.06.15
This CVE's current EPSS score of 0.0150 is in the 54th percentile among its peer group of 23,701 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

Patch Available

Vendor Patches (3)

redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 3Fixed in: fetchmail-0:6.2.0-3.el3.5
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 4Fixed in: fetchmail-0:6.2.5-6.0.1.el4_8.1
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 5Fixed in: fetchmail-0:6.3.6-1.1.el5_3.1
View patch

Vendor Advisories (1)

redhatCVE-2009-2666Moderate

fetchmail: SSL null terminator bypass

Aug 5, 2009

References

fetchmail.berlios.de / fetchmail-SA-2009-01.txt
lists.apple.com / archives/security-announce/2009/Nov/msg00000.html
marc.info
osvdb.org / 56855
secunia.com / advisories/36175
Vendor Advisory
secunia.com / advisories/36179
Vendor Advisory
secunia.com / advisories/36236
Vendor Advisory
oval.cisecurity.org / repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A11059
support.apple.com / kb/HT3937
debian.org / security/2009/dsa-1852
mandriva.com / security/advisories
securityfocus.com / archive/1/505530/100/0/threaded
securityfocus.com / bid/35951
securitytracker.com / id
slackware.com / security/viewer.php
vupen.com / english/advisories/2009/2155
Vendor Advisory
vupen.com / english/advisories/2009/3184
Vendor Advisory