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    CVE-2006-4924

    sshd in OpenSSH before 4.4, when using the version 1 SSH protocol, allows remote attackers to cause a denial of service (CPU consumption) via an SSH packet that contains duplicate blocks, which is not properly handled by the CRC compensation attack detector.

    Published:Sep 19, 2006
    Last Modified:Apr 23, 2026
    EPS:Sep 27, 2006
    EPSS Score:0.54323
    CVSS Score:7.8

    Affected Products

    Vendor
    Openbsd
    Product
    Openssh
    Vendor
    Redhat
    Product
    Enterprise Linux

    Exploits

    http://www.securityfocus.com/bid/20216http://www.securityfocus.com/bid/20216https://www.exploit-db.com/exploits/2444

    Common Weakness Enumeration

    No CWE recorded yet

    Common Attack Pattern Enumeration and Classification (CAPEC)

    No CAPEC recorded yet

    Related CVEs

    CVE-2026-73283 (CVSS 2.5) — In sshd in OpenSSH before 10.5, the restrict keyword (in authorized_keys) was supposed to be applicable to tun…
    CVE-2026-73282 (CVSS 4.8) — In ssh in OpenSSH before 10.5, a use-after-free for realloc data can occur if a certain pair of remote-forward…
    CVE-2026-73281 (CVSS 3.5) — In ssh-agent in OpenSSH before 10.5, some operations can occur remotely but were intended to occur only locall…
    CVE-2026-60002 (CVSS 7.7) — ssh in OpenSSH before 10.4 can have a use-after-free when a server changes its host key during a key re-exchan…
    CVE-2026-60001 (CVSS 6.5) — sshd in OpenSSH before 10.4 does not always honor the minimum authentication delay.…
    CVE-2026-60000 (CVSS 3.7) — sshd in OpenSSH before 10.4 allows remote attackers to cause a denial of service (resource consumption from ex…
    CVE-2026-59999 (CVSS 5.9) — In sshd in OpenSSH before 10.4, DisableForwarding=yes was supposed to take precedence over PermitTunnel=yes, b…
    CVE-2026-59998 (CVSS 4.8) — sshd in OpenSSH before 10.4 has an undocumented security-relevant behavior: GSSAPIStrictAcceptorCheck has no v…
    CVE-2026-59997 (CVSS 4.2) — internal-sftp in sshd in OpenSSH before 10.4 recognizes only the first 9 command-line arguments, which can be …
    CVE-2026-59996 (CVSS 4.2) — scp in OpenSSH before 10.4 may place a file in the parent directory of an intended directory when the copy occ…

    References

    ftp://ftp.freebsd.org/pub/FreeBSD/CERT/advisories/FreeBSD-SA-06:22.openssh.asc
    ftp://ftp.sco.com/pub/unixware7/714/security/p534336/p534336.txt
    ftp://patches.sgi.com/support/free/security/advisories/20061001-01-P.asc
    http://blogs.sun.com/security/entry/sun_alert_102962_security_vulnerability
    http://bugs.gentoo.org/show_bug.cgi?id=148228
    http://docs.info.apple.com/article.html?artnum=305214
    http://itrc.hp.com/service/cki/docDisplay.do?docId=c00815112
    http://lists.apple.com/archives/security-announce/2007/Mar/msg00002.html
    http://marc.info/?l=openssh-unix-dev&m=115939141729160&w=2
    http://secunia.com/advisories/21923
    http://secunia.com/advisories/22091
    http://secunia.com/advisories/22116
    http://secunia.com/advisories/22158
    http://secunia.com/advisories/22164
    http://secunia.com/advisories/22183
    http://secunia.com/advisories/22196
    http://secunia.com/advisories/22208
    http://secunia.com/advisories/22236
    http://secunia.com/advisories/22245
    http://secunia.com/advisories/22270
    http://secunia.com/advisories/22298
    http://secunia.com/advisories/22352
    http://secunia.com/advisories/22362
    http://secunia.com/advisories/22487
    http://secunia.com/advisories/22495
    http://secunia.com/advisories/22823
    http://secunia.com/advisories/22926
    http://secunia.com/advisories/23038
    http://secunia.com/advisories/23241
    http://secunia.com/advisories/23340
    http://secunia.com/advisories/23680
    http://secunia.com/advisories/24479
    http://secunia.com/advisories/24799
    http://secunia.com/advisories/24805
    http://secunia.com/advisories/25608
    http://secunia.com/advisories/29371
    http://secunia.com/advisories/34274
    http://security.freebsd.org/advisories/FreeBSD-SA-06%3A22.openssh.asc
    http://security.gentoo.org/glsa/glsa-200609-17.xml
    http://security.gentoo.org/glsa/glsa-200611-06.xml
    http://securitytracker.com/id?1016931
    http://slackware.com/security/viewer.php?l=slackware-security&y=2006&m=slackware-security.592566
    http://sourceforge.net/forum/forum.php?forum_id=681763
    http://sourceforge.net/project/shownotes.php?release_id=461863&group_id=69227
    http://sunsolve.sun.com/search/document.do?assetkey=1-26-102962-1
    http://support.avaya.com/elmodocs2/security/ASA-2006-216.htm
    http://support.avaya.com/elmodocs2/security/ASA-2006-262.htm
    http://www-unix.globus.org/mail_archive/security-announce/2007/04/msg00000.html
    http://www.debian.org/security/2006/dsa-1189
    http://www.debian.org/security/2006/dsa-1212
    http://www.kb.cert.org/vuls/id/787448
    http://www.mandriva.com/security/advisories?name=MDKSA-2006:179
    http://www.novell.com/linux/security/advisories/2006_24_sr.html
    http://www.novell.com/linux/security/advisories/2006_62_openssh.html
    http://www.openbsd.org/errata.html#ssh
    http://www.openpkg.org/security/advisories/OpenPKG-SA-2006.022-openssh.html
    http://www.osvdb.org/29152
    http://www.redhat.com/support/errata/RHSA-2006-0697.html
    http://www.redhat.com/support/errata/RHSA-2006-0698.html
    http://www.securityfocus.com/archive/1/447153/100/0/threaded
    http://www.securityfocus.com/bid/20216
    http://www.trustix.org/errata/2006/0054
    http://www.ubuntu.com/usn/usn-355-1
    http://www.us-cert.gov/cas/techalerts/TA07-072A.html
    http://www.vmware.com/support/vi3/doc/esx-3069097-patch.html
    http://www.vmware.com/support/vi3/doc/esx-9986131-patch.html
    http://www.vupen.com/english/advisories/2006/3777
    http://www.vupen.com/english/advisories/2006/4401
    http://www.vupen.com/english/advisories/2006/4869
    http://www.vupen.com/english/advisories/2007/0930
    http://www.vupen.com/english/advisories/2007/1332
    http://www.vupen.com/english/advisories/2007/2119
    http://www.vupen.com/english/advisories/2009/0740
    https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=207955
    https://exchange.xforce.ibmcloud.com/vulnerabilities/29158
    https://hypersonic.bluecoat.com/support/securityadvisories/ssh_server_on_sg
    https://issues.rpath.com/browse/RPL-661
    https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A10462
    https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A1193
    ftp://ftp.freebsd.org/pub/FreeBSD/CERT/advisories/FreeBSD-SA-06:22.openssh.asc
    ftp://ftp.sco.com/pub/unixware7/714/security/p534336/p534336.txt
    ftp://patches.sgi.com/support/free/security/advisories/20061001-01-P.asc
    http://blogs.sun.com/security/entry/sun_alert_102962_security_vulnerability
    http://bugs.gentoo.org/show_bug.cgi?id=148228
    http://docs.info.apple.com/article.html?artnum=305214
    http://itrc.hp.com/service/cki/docDisplay.do?docId=c00815112
    http://lists.apple.com/archives/security-announce/2007/Mar/msg00002.html
    http://marc.info/?l=openssh-unix-dev&m=115939141729160&w=2
    http://secunia.com/advisories/21923
    http://secunia.com/advisories/22091
    http://secunia.com/advisories/22116
    http://secunia.com/advisories/22158
    http://secunia.com/advisories/22164
    http://secunia.com/advisories/22183
    http://secunia.com/advisories/22196
    http://secunia.com/advisories/22208
    http://secunia.com/advisories/22236
    http://secunia.com/advisories/22245
    http://secunia.com/advisories/22270
    http://secunia.com/advisories/22298
    http://secunia.com/advisories/22352
    http://secunia.com/advisories/22362
    http://secunia.com/advisories/22487
    http://secunia.com/advisories/22495
    http://secunia.com/advisories/22823
    http://secunia.com/advisories/22926
    http://secunia.com/advisories/23038
    http://secunia.com/advisories/23241
    http://secunia.com/advisories/23340
    http://secunia.com/advisories/23680
    http://secunia.com/advisories/24479
    http://secunia.com/advisories/24799
    http://secunia.com/advisories/24805
    http://secunia.com/advisories/25608
    http://secunia.com/advisories/29371
    http://secunia.com/advisories/34274
    http://security.freebsd.org/advisories/FreeBSD-SA-06%3A22.openssh.asc
    http://security.gentoo.org/glsa/glsa-200609-17.xml
    http://security.gentoo.org/glsa/glsa-200611-06.xml
    http://securitytracker.com/id?1016931
    http://slackware.com/security/viewer.php?l=slackware-security&y=2006&m=slackware-security.592566
    http://sourceforge.net/forum/forum.php?forum_id=681763
    http://sourceforge.net/project/shownotes.php?release_id=461863&group_id=69227
    http://sunsolve.sun.com/search/document.do?assetkey=1-26-102962-1
    http://support.avaya.com/elmodocs2/security/ASA-2006-216.htm
    http://support.avaya.com/elmodocs2/security/ASA-2006-262.htm
    http://www-unix.globus.org/mail_archive/security-announce/2007/04/msg00000.html
    http://www.debian.org/security/2006/dsa-1189
    http://www.debian.org/security/2006/dsa-1212
    http://www.kb.cert.org/vuls/id/787448
    http://www.mandriva.com/security/advisories?name=MDKSA-2006:179
    http://www.novell.com/linux/security/advisories/2006_24_sr.html
    http://www.novell.com/linux/security/advisories/2006_62_openssh.html
    http://www.openbsd.org/errata.html#ssh
    http://www.openpkg.org/security/advisories/OpenPKG-SA-2006.022-openssh.html
    http://www.osvdb.org/29152
    http://www.redhat.com/support/errata/RHSA-2006-0697.html
    http://www.redhat.com/support/errata/RHSA-2006-0698.html
    http://www.securityfocus.com/archive/1/447153/100/0/threaded
    http://www.securityfocus.com/bid/20216
    http://www.trustix.org/errata/2006/0054
    http://www.ubuntu.com/usn/usn-355-1
    http://www.us-cert.gov/cas/techalerts/TA07-072A.html
    http://www.vmware.com/support/vi3/doc/esx-3069097-patch.html
    http://www.vmware.com/support/vi3/doc/esx-9986131-patch.html
    http://www.vupen.com/english/advisories/2006/3777
    http://www.vupen.com/english/advisories/2006/4401
    http://www.vupen.com/english/advisories/2006/4869
    http://www.vupen.com/english/advisories/2007/0930
    http://www.vupen.com/english/advisories/2007/1332
    http://www.vupen.com/english/advisories/2007/2119
    http://www.vupen.com/english/advisories/2009/0740
    https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=207955
    https://exchange.xforce.ibmcloud.com/vulnerabilities/29158
    https://hypersonic.bluecoat.com/support/securityadvisories/ssh_server_on_sg
    https://issues.rpath.com/browse/RPL-661
    https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A10462
    https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A1193

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High