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Vulnerability record · CVE-2009-4565 · published 4 January 2010

CVE-2009-4565: Sendmail vulnerability

Sendmail · Sendmail

sendmail before 8.14.4 does not properly handle a '\0' character in a Common Name (CN) field of an X.509 certificate, which (1) allows man-in-the-middle attackers to spoof arbitrary SSL-based SMTP servers via a crafted server certificate issued by a legitimate Certification Authority, and (2) allows remote attackers to bypass intended access restrictions via a crafted client certificate issued by a legitimate Certification Authority, a related issue to CVE-2009-2408.

7.5 CVSS 2.0 High EPSS 2.4% · top 16.7% CWE-310 · CWE-310
7.5CVSS 2.0 base score
2.4%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
40References
16 Jun 2026Last modified by NVD

Description

sendmail before 8.14.4 does not properly handle a '\0' character in a Common Name (CN) field of an X.509 certificate, which (1) allows man-in-the-middle attackers to spoof arbitrary SSL-based SMTP servers via a crafted server certificate issued by a legitimate Certification Authority, and (2) allows remote attackers to bypass intended access restrictions via a crafted client 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:P

Affected products

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

References

LinkTags
http://lists.opensuse.org/opensuse-security-announce/2010-03/msg00004.html
http://marc.info/?l=bugtraq&m=126953289726317&w=2
http://secunia.com/advisories/37998 Vendor Advisory
http://secunia.com/advisories/38314
http://secunia.com/advisories/38915
http://secunia.com/advisories/39088
http://secunia.com/advisories/40109
http://secunia.com/advisories/43366
http://security.gentoo.org/glsa/glsa-201206-30.xml
http://sunsolve.sun.com/search/document.do?assetkey=1-77-1021797.1-1
http://www.debian.org/security/2010/dsa-1985
http://www.redhat.com/support/errata/RHSA-2011-0262.html
http://www.securityfocus.com/bid/37543
http://www.sendmail.org/releases/8.14.4 Patch
http://www.vupen.com/english/advisories/2009/3661 PatchVendor Advisory
http://www.vupen.com/english/advisories/2010/0719
http://www.vupen.com/english/advisories/2010/1386
http://www.vupen.com/english/advisories/2011/0415
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A10255
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A11822
http://lists.opensuse.org/opensuse-security-announce/2010-03/msg00004.html
http://marc.info/?l=bugtraq&m=126953289726317&w=2
http://secunia.com/advisories/37998 Vendor Advisory
http://secunia.com/advisories/38314
http://secunia.com/advisories/38915
http://secunia.com/advisories/39088
http://secunia.com/advisories/40109
http://secunia.com/advisories/43366
http://security.gentoo.org/glsa/glsa-201206-30.xml
http://sunsolve.sun.com/search/document.do?assetkey=1-77-1021797.1-1
http://www.debian.org/security/2010/dsa-1985
http://www.redhat.com/support/errata/RHSA-2011-0262.html
http://www.securityfocus.com/bid/37543
http://www.sendmail.org/releases/8.14.4 Patch
http://www.vupen.com/english/advisories/2009/3661 PatchVendor Advisory
http://www.vupen.com/english/advisories/2010/0719
http://www.vupen.com/english/advisories/2010/1386
http://www.vupen.com/english/advisories/2011/0415
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A10255
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A11822

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Related vulnerabilities

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

10.0CVE-2003-0694Sendmail prescan buffer overflow allows remote code executionThe prescan function in Sendmail 8.12.9 contains a buffer overflow reachable through crafted email addresses, as demonstrated via the parseaddr funct…EPSS 66%analysed10.0CVE-2003-0161Sendmail vulnerabilityThe prescan() function in the address parser (parseaddr.c) in Sendmail before 8.12.9 does not properly handle certain conversions from char and int t…EPSS 39%10.0CVE-2002-1337Sendmail crackaddr buffer overflow allows remote code executionSendmail versions 5.79 through 8.12.7 contain a buffer overflow in the crackaddr function in headers.c, triggered by specially formatted sender and r…EPSS 73%analysed7.8CVE-2007-2246Sendmail vulnerabilityUnspecified vulnerability in HP-UX B.11.00 and B.11.11, when running sendmail 8.9.3 or 8.11.1; and HP-UX B.11.23 when running sendmail 8.11.1; allows…EPSS 2.3%7.6CVE-2006-0058Sendmail vulnerabilitySignal handler race condition in Sendmail 8.13.x before 8.13.6 allows remote attackers to execute arbitrary code by triggering timeouts in a way that…EPSS 29%7.5CVE-2006-7175Sendmail vulnerabilityThe version of Sendmail 8.13.1-2 on Red Hat Enterprise Linux 4 Update 4 and earlier does not allow the administrator to disable SSLv2 encryption, whi…EPSS 0.82%7.5CVE-2006-4434Sendmail use after free vulnerabilityUse-after-free vulnerability in Sendmail before 8.13.8 allows remote attackers to cause a denial of service (crash) via a long "header line", which c…EPSS 4.5%7.5CVE-2003-0681Sendmail advanced message server vulnerabilityA "potential buffer overflow in ruleset parsing" for Sendmail 8.12.9, when using the nonstandard rulesets (1) recipient (2), final, or (3) mailer-spe…EPSS 22%

Source: NIST National Vulnerability Database (record CVE-2009-4565), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.