CVE-2006-5051

Name: CVE-2006-5051
Creator: NVD / NIST
Published: 2006-09-27T23:07:00+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 8.1/10EPSS 44.96%

Last modified Jun 16, 2026

CVE-2006-5051 is a high-severity vulnerability rated 8.1/10 on the CVSS scale. Signal handler race condition in OpenSSH before 4.4 allows remote attackers to cause a denial of service (crash), and possibly execute arbitrary code if GSSAPI authentication is enabled, via unspecified vectors that lead to a double-free.. EPSS estimates a 44.96% chance of exploitation in the next 30 days.

Description

Signal handler race condition in OpenSSH before 4.4 allows remote attackers to cause a denial of service (crash), and possibly execute arbitrary code if GSSAPI authentication is enabled, via unspecified vectors that lead to a double-free.

Metrics

CVSS 3.1

8.1/10

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS Probability

44.96%

98.6th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-415

Affected Software

Vendor	Product	Versions
Openbsd	Openssh	<= 4.4
Debian	Debian Linux	3.1
Apple	Mac Os X	< 10.3.9
Apple	Mac Os X	>= 10.4, <= 10.4.8
Apple	Mac Os X Server	< 10.3.9
Apple	Mac Os X Server	>= 10.4, <= 10.4.8

References

ftp://ftp.freebsd.org/pub/FreeBSD/CERT/advisories/FreeBSD-SA-06:22.openssh.ascBroken Link
ftp://patches.sgi.com/support/free/security/advisories/20061001-01-P.ascBroken Link
http://docs.info.apple.com/article.html?artnum=305214Broken Link
http://lists.apple.com/archives/security-announce/2007/Mar/msg00002.htmlMailing List
http://lists.freebsd.org/pipermail/freebsd-security/2006-October/004051.htmlMailing List
http://marc.info/?l=openssh-unix-dev&m=115939141729160&w=2Mailing List
http://openssh.org/txt/release-4.4Release Notes
http://secunia.com/advisories/22158Broken Link, Vendor Advisory
http://secunia.com/advisories/22173Broken Link, Vendor Advisory
http://secunia.com/advisories/22183Broken Link, Vendor Advisory
http://secunia.com/advisories/22196Broken Link, Vendor Advisory
http://secunia.com/advisories/22208Broken Link, Vendor Advisory
http://secunia.com/advisories/22236Broken Link, Vendor Advisory
http://secunia.com/advisories/22245Broken Link, Vendor Advisory
http://secunia.com/advisories/22270Broken Link, Vendor Advisory
http://secunia.com/advisories/22352Broken Link, Vendor Advisory
http://secunia.com/advisories/22362Broken Link, Vendor Advisory
http://secunia.com/advisories/22487Broken Link, Vendor Advisory
http://secunia.com/advisories/22495Broken Link
http://secunia.com/advisories/22823Broken Link, Vendor Advisory
http://secunia.com/advisories/22926Broken Link, Vendor Advisory
http://secunia.com/advisories/23680Broken Link, Vendor Advisory
http://secunia.com/advisories/24479Broken Link, Vendor Advisory
http://secunia.com/advisories/24799Broken Link, Vendor Advisory
http://secunia.com/advisories/24805Broken Link, Vendor Advisory
http://security.freebsd.org/advisories/FreeBSD-SA-06%3A22.openssh.ascThird Party Advisory
http://security.gentoo.org/glsa/glsa-200611-06.xmlThird Party Advisory
http://securitytracker.com/id?1016940Broken Link, Third Party Advisory, VDB Entry
http://slackware.com/security/viewer.php?l=slackware-security&y=2006&m=slackware-security.592566Broken Link
http://sourceforge.net/forum/forum.php?forum_id=681763Broken Link
http://support.avaya.com/elmodocs2/security/ASA-2006-216.htmThird Party Advisory
http://www-unix.globus.org/mail_archive/security-announce/2007/04/msg00000.htmlBroken Link
http://www.arkoon.fr/upload/alertes/36AK-2006-07-FR-1.0_FAST360_OPENSSH.pdfBroken Link
http://www.arkoon.fr/upload/alertes/43AK-2006-09-FR-1.0_SSL360_OPENSSH.pdfBroken Link
http://www.debian.org/security/2006/dsa-1189Mailing List
http://www.debian.org/security/2006/dsa-1212Broken Link
http://www.kb.cert.org/vuls/id/851340Third Party Advisory, US Government Resource
http://www.mandriva.com/security/advisories?name=MDKSA-2006:179Third Party Advisory
http://www.novell.com/linux/security/advisories/2006_62_openssh.htmlBroken Link
http://www.openbsd.org/errata.html#sshRelease Notes
http://www.openpkg.org/security/advisories/OpenPKG-SA-2006.022-openssh.htmlBroken Link
http://www.openwall.com/lists/oss-security/2024/07/01/3
http://www.openwall.com/lists/oss-security/2024/07/28/3
http://www.osvdb.org/29264Broken Link
http://www.redhat.com/support/errata/RHSA-2006-0697.htmlBroken Link
http://www.redhat.com/support/errata/RHSA-2006-0698.htmlBroken Link
http://www.securityfocus.com/bid/20241Broken Link, Third Party Advisory, VDB Entry
http://www.ubuntu.com/usn/usn-355-1Broken Link
http://www.us-cert.gov/cas/techalerts/TA07-072A.htmlThird Party Advisory, US Government Resource
http://www.vmware.com/support/vi3/doc/esx-3069097-patch.htmlBroken Link
http://www.vmware.com/support/vi3/doc/esx-9986131-patch.htmlBroken Link
http://www.vupen.com/english/advisories/2006/4018Broken Link
http://www.vupen.com/english/advisories/2006/4329Broken Link
http://www.vupen.com/english/advisories/2007/0930Broken Link
http://www.vupen.com/english/advisories/2007/1332Broken Link
https://exchange.xforce.ibmcloud.com/vulnerabilities/29254Third Party Advisory, VDB Entry
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A11387Broken Link
https://www.openwall.com/lists/oss-security/2024/07/28/3
ftp://ftp.freebsd.org/pub/FreeBSD/CERT/advisories/FreeBSD-SA-06:22.openssh.ascBroken Link
ftp://patches.sgi.com/support/free/security/advisories/20061001-01-P.ascBroken Link
http://docs.info.apple.com/article.html?artnum=305214Broken Link
http://lists.apple.com/archives/security-announce/2007/Mar/msg00002.htmlMailing List
http://lists.freebsd.org/pipermail/freebsd-security/2006-October/004051.htmlMailing List
http://marc.info/?l=openssh-unix-dev&m=115939141729160&w=2Mailing List
http://openssh.org/txt/release-4.4Release Notes
http://secunia.com/advisories/22158Broken Link, Vendor Advisory
http://secunia.com/advisories/22173Broken Link, Vendor Advisory
http://secunia.com/advisories/22183Broken Link, Vendor Advisory
http://secunia.com/advisories/22196Broken Link, Vendor Advisory
http://secunia.com/advisories/22208Broken Link, Vendor Advisory
http://secunia.com/advisories/22236Broken Link, Vendor Advisory
http://secunia.com/advisories/22245Broken Link, Vendor Advisory
http://secunia.com/advisories/22270Broken Link, Vendor Advisory
http://secunia.com/advisories/22352Broken Link, Vendor Advisory
http://secunia.com/advisories/22362Broken Link, Vendor Advisory
http://secunia.com/advisories/22487Broken Link, Vendor Advisory
http://secunia.com/advisories/22495Broken Link
http://secunia.com/advisories/22823Broken Link, Vendor Advisory
http://secunia.com/advisories/22926Broken Link, Vendor Advisory
http://secunia.com/advisories/23680Broken Link, Vendor Advisory
http://secunia.com/advisories/24479Broken Link, Vendor Advisory
http://secunia.com/advisories/24799Broken Link, Vendor Advisory
http://secunia.com/advisories/24805Broken Link, Vendor Advisory
http://security.freebsd.org/advisories/FreeBSD-SA-06%3A22.openssh.ascThird Party Advisory
http://security.gentoo.org/glsa/glsa-200611-06.xmlThird Party Advisory
http://securitytracker.com/id?1016940Broken Link, Third Party Advisory, VDB Entry
http://slackware.com/security/viewer.php?l=slackware-security&y=2006&m=slackware-security.592566Broken Link
http://sourceforge.net/forum/forum.php?forum_id=681763Broken Link
http://support.avaya.com/elmodocs2/security/ASA-2006-216.htmThird Party Advisory
http://www-unix.globus.org/mail_archive/security-announce/2007/04/msg00000.htmlBroken Link
http://www.arkoon.fr/upload/alertes/36AK-2006-07-FR-1.0_FAST360_OPENSSH.pdfBroken Link
http://www.arkoon.fr/upload/alertes/43AK-2006-09-FR-1.0_SSL360_OPENSSH.pdfBroken Link
http://www.debian.org/security/2006/dsa-1189Mailing List
http://www.debian.org/security/2006/dsa-1212Broken Link
http://www.kb.cert.org/vuls/id/851340Third Party Advisory, US Government Resource
http://www.mandriva.com/security/advisories?name=MDKSA-2006:179Third Party Advisory
http://www.novell.com/linux/security/advisories/2006_62_openssh.htmlBroken Link
http://www.openbsd.org/errata.html#sshRelease Notes
http://www.openpkg.org/security/advisories/OpenPKG-SA-2006.022-openssh.htmlBroken Link
http://www.openwall.com/lists/oss-security/2024/07/01/3
http://www.openwall.com/lists/oss-security/2024/07/28/3
http://www.osvdb.org/29264Broken Link
http://www.redhat.com/support/errata/RHSA-2006-0697.htmlBroken Link
http://www.redhat.com/support/errata/RHSA-2006-0698.htmlBroken Link
http://www.securityfocus.com/bid/20241Broken Link, Third Party Advisory, VDB Entry
http://www.ubuntu.com/usn/usn-355-1Broken Link
http://www.us-cert.gov/cas/techalerts/TA07-072A.htmlThird Party Advisory, US Government Resource
http://www.vmware.com/support/vi3/doc/esx-3069097-patch.htmlBroken Link
http://www.vmware.com/support/vi3/doc/esx-9986131-patch.htmlBroken Link
http://www.vupen.com/english/advisories/2006/4018Broken Link
http://www.vupen.com/english/advisories/2006/4329Broken Link
http://www.vupen.com/english/advisories/2007/0930Broken Link
http://www.vupen.com/english/advisories/2007/1332Broken Link
https://exchange.xforce.ibmcloud.com/vulnerabilities/29254Third Party Advisory, VDB Entry
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A11387Broken Link
https://www.openwall.com/lists/oss-security/2024/07/28/3

Timeline

Published: Sep 27, 2006
Last Modified: Jun 16, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2006-5051?

How severe is CVE-2006-5051?

CVE-2006-5051 has a CVSS score of 8.1/10 (HIGH severity). The EPSS model estimates a 44.96% probability of exploitation in the next 30 days.

How do I fix CVE-2006-5051?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2006-5051?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST