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Vulnerability record · CVE-2009-2666 · published 7 August 2009

CVE-2009-2666: Fetchmail vulnerability

Fetchmail · Fetchmail

socket.c in fetchmail before 6.3.11 does not properly handle a '\0' character in a domain name in the subject's Common Name (CN) field of an X.509 certificate, which allows man-in-the-middle attackers to spoof arbitrary SSL servers via a crafted certificate issued by a legitimate Certification Authority, a related issue to CVE-2009-2408.

6.4 CVSS 2.0 Medium EPSS 1.5% · top 26.7% CWE-310 · CWE-310
6.4CVSS 2.0 base score
1.5%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
34References
16 Jun 2026Last modified by NVD

Description

socket.c in fetchmail before 6.3.11 does not properly handle a '\0' character in a domain name in the subject's Common Name (CN) field of an X.509 certificate, which allows man-in-the-middle attackers to spoof arbitrary SSL servers via a crafted certificate issued by a legitimate Certification Authority, a related issue to CVE-2009-2408.

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

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
http://fetchmail.berlios.de/fetchmail-SA-2009-01.txt
http://lists.apple.com/archives/security-announce/2009/Nov/msg00000.html
http://marc.info/?l=oss-security&m=124949601207156&w=2
http://osvdb.org/56855
http://secunia.com/advisories/36175 Vendor Advisory
http://secunia.com/advisories/36179 Vendor Advisory
http://secunia.com/advisories/36236 Vendor Advisory
http://support.apple.com/kb/HT3937
http://www.debian.org/security/2009/dsa-1852
http://www.mandriva.com/security/advisories?name=MDVSA-2009:201
http://www.securityfocus.com/archive/1/505530/100/0/threaded
http://www.securityfocus.com/bid/35951
http://www.securitytracker.com/id?1022679
http://www.slackware.com/security/viewer.php?l=slackware-security&y=2009&m=slackware-security.543463
http://www.vupen.com/english/advisories/2009/2155 Vendor Advisory
http://www.vupen.com/english/advisories/2009/3184 Vendor Advisory
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A11059
http://fetchmail.berlios.de/fetchmail-SA-2009-01.txt
http://lists.apple.com/archives/security-announce/2009/Nov/msg00000.html
http://marc.info/?l=oss-security&m=124949601207156&w=2
http://osvdb.org/56855
http://secunia.com/advisories/36175 Vendor Advisory
http://secunia.com/advisories/36179 Vendor Advisory
http://secunia.com/advisories/36236 Vendor Advisory
http://support.apple.com/kb/HT3937
http://www.debian.org/security/2009/dsa-1852
http://www.mandriva.com/security/advisories?name=MDVSA-2009:201
http://www.securityfocus.com/archive/1/505530/100/0/threaded
http://www.securityfocus.com/bid/35951
http://www.securitytracker.com/id?1022679
http://www.slackware.com/security/viewer.php?l=slackware-security&y=2009&m=slackware-security.543463
http://www.vupen.com/english/advisories/2009/2155 Vendor Advisory
http://www.vupen.com/english/advisories/2009/3184 Vendor Advisory
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A11059

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

10.0CVE-2001-1009Fetchmail permissions and access controls vulnerabilityFetchmail (aka fetchmail-ssl) before 5.8.17 allows a remote malicious (1) IMAP server or (2) POP/POP3 server to overwrite arbitrary memory and possib…EPSS 6.5%10.0CVE-2001-0101Fetchmail vulnerabilityVulnerability in fetchmail 5.5.0-2 and earlier in the AUTHENTICATE GSSAPI command.EPSS 1.8%7.8CVE-2006-5867Fetchmail improper input validation vulnerabilityfetchmail before 6.3.6-rc4 does not properly enforce TLS and may transmit cleartext passwords over unsecured links if certain circumstances occur, wh…EPSS 4.4%7.8CVE-2006-5974Fetchmail improper input validation vulnerabilityfetchmail 6.3.5 and 6.3.6 before 6.3.6-rc4, when refusing a message delivered via the mda option, allows remote attackers to cause a denial of servic…EPSS 3.9%7.8CVE-2005-4348Fetchmail vulnerabilityfetchmail before 6.3.1 and before 6.2.5.5, when configured for multidrop mode, allows remote attackers to cause a denial of service (application cras…EPSS 3.6%7.5CVE-2021-36386Fetchmail vulnerabilityreport_vbuild in report.c in Fetchmail before 6.4.20 sometimes omits initialization of the vsnprintf va_list argument, which might allow mail servers…EPSS 2.6%7.5CVE-2002-1365Fetchmail memory buffer overflow vulnerabilityHeap-based buffer overflow in Fetchmail 6.1.3 and earlier does not account for the "@" character when determining buffer lengths for local addresses,…EPSS 5.0%7.5CVE-2002-1174Fetchmail memory buffer overflow vulnerabilityBuffer overflows in Fetchmail 6.0.0 and earlier allow remote attackers to cause a denial of service (crash) or execute arbitrary code via (1) long he…EPSS 4.7%

Source: NIST National Vulnerability Database (record CVE-2009-2666), CISA KEV, FIRST EPSS (scores of 2026-09-29). This page is refreshed as NVD updates the record.