CVE-2006-4924

Exp

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: 2006-09-27 Last update: 2026-04-23 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2006-4924 is rated High Exploit Risk (84/100): CVSS High severity, with high exploitation likelihood (EPSS 54.32%, 98th percentile). 2 public exploit reference(s) are indexed (Exploit-DB). EPSS rose +3.47% over the last day, indicating growing attacker interest. Public exploits are available—assess exposure, apply mitigations, and prioritize patching.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Public exploit references (Exploit-DB) for CVE-2006-4924

EDB-ID Source Kind Published Link
2444 exploit_db edb 2006-09-27 Exploit-DB ↗
— nvd_ref exploit_tag Exploit-DB ↗

Exploit prediction scoring system (EPSS) score for CVE-2006-4924

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-03-04 50.85% 54.32% +3.47%
2 2026-03-01 54.32% 50.85% -3.47%
3 2026-02-07 — 54.32% —

Full EPSS history (57 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2006-4924

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
7.8 2.0 HIGH
AV:N/AC:L/Au:N/C:N/I:N/A:C Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:L)
Exploitation conditions are straightforward and predictable.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:N)
No confidentiality impact.
Integrity impact (I:N)
No integrity impact.
Availability impact (A:C)
Complete availability impact.
 10.0 6.9 [email protected]

Weakness enumeration for CVE-2006-4924

OS Trackers for CVE-2006-4924

vendor priority summary link
alpine — CVE-2006-4924: no source package rows; 0 state rows across 0 repos (none); fixed 0, open 0. https://security.alpinelinux.org/vuln/CVE-2006-4924
debian low CVE-2006-4924 low priority: Debian including 1 source packages (openssh), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5. https://security-tracker.debian.org/tracker/CVE-2006-4924
gentoo normal CVE-2006-4924: 1 GLSA(s) (200609-17), 1 atom(s) (net-misc/openssh); latest impact normal. https://bugs.gentoo.org/buglist.cgi?quicksearch=CVE-2006-4924
redhat medium — https://access.redhat.com/security/cve/CVE-2006-4924
ubuntu medium CVE-2006-4924 medium priority: Ubuntu including 1 source packages (openssh), 4 status rows across 4 suites (dapper, edgy, feisty, upstream): released 3, needs-triage 1. https://ubuntu.com/security/CVE-2006-4924

Vendor comments (NVD) for CVE-2006-4924

  • Red Hat (2007-03-14T00:00:00)

    Red Hat Enterprise Linux 5 is not vulnerable to this issue as it contains a backported patch.

Affected software / configurations for CVE-2006-4924

Vendor Product Version Raw CPE
openbsd openssh 1.2 cpe:2.3:a:openbsd:openssh:1.2:*:*:*:*:*:*:*
openbsd openssh 1.2.1 cpe:2.3:a:openbsd:openssh:1.2.1:*:*:*:*:*:*:*
openbsd openssh 1.2.2 cpe:2.3:a:openbsd:openssh:1.2.2:*:*:*:*:*:*:*
openbsd openssh 1.2.3 cpe:2.3:a:openbsd:openssh:1.2.3:*:*:*:*:*:*:*
openbsd openssh 1.2.27 cpe:2.3:a:openbsd:openssh:1.2.27:*:*:*:*:*:*:*
openbsd openssh 2.1 cpe:2.3:a:openbsd:openssh:2.1:*:*:*:*:*:*:*
openbsd openssh 2.1.1 cpe:2.3:a:openbsd:openssh:2.1.1:*:*:*:*:*:*:*
openbsd openssh 2.2 cpe:2.3:a:openbsd:openssh:2.2:*:*:*:*:*:*:*
openbsd openssh 2.3 cpe:2.3:a:openbsd:openssh:2.3:*:*:*:*:*:*:*
openbsd openssh 2.5 cpe:2.3:a:openbsd:openssh:2.5:*:*:*:*:*:*:*
openbsd openssh 2.5.1 cpe:2.3:a:openbsd:openssh:2.5.1:*:*:*:*:*:*:*
openbsd openssh 2.5.2 cpe:2.3:a:openbsd:openssh:2.5.2:*:*:*:*:*:*:*
openbsd openssh 2.9 cpe:2.3:a:openbsd:openssh:2.9:*:*:*:*:*:*:*
openbsd openssh 2.9.9 cpe:2.3:a:openbsd:openssh:2.9.9:*:*:*:*:*:*:*
openbsd openssh 2.9.9p2 cpe:2.3:a:openbsd:openssh:2.9.9p2:*:*:*:*:*:*:*
openbsd openssh 2.9p1 cpe:2.3:a:openbsd:openssh:2.9p1:*:*:*:*:*:*:*
openbsd openssh 2.9p2 cpe:2.3:a:openbsd:openssh:2.9p2:*:*:*:*:*:*:*
openbsd openssh 3.0 cpe:2.3:a:openbsd:openssh:3.0:*:*:*:*:*:*:*
openbsd openssh 3.0.1 cpe:2.3:a:openbsd:openssh:3.0.1:*:*:*:*:*:*:*
openbsd openssh 3.0.1p1 cpe:2.3:a:openbsd:openssh:3.0.1p1:*:*:*:*:*:*:*
openbsd openssh 3.0.2 cpe:2.3:a:openbsd:openssh:3.0.2:*:*:*:*:*:*:*
openbsd openssh 3.0.2p1 cpe:2.3:a:openbsd:openssh:3.0.2p1:*:*:*:*:*:*:*
openbsd openssh 3.0p1 cpe:2.3:a:openbsd:openssh:3.0p1:*:*:*:*:*:*:*
openbsd openssh 3.1 cpe:2.3:a:openbsd:openssh:3.1:*:*:*:*:*:*:*
openbsd openssh 3.1p1 cpe:2.3:a:openbsd:openssh:3.1p1:*:*:*:*:*:*:*
openbsd openssh 3.2 cpe:2.3:a:openbsd:openssh:3.2:*:*:*:*:*:*:*
openbsd openssh 3.2.2 cpe:2.3:a:openbsd:openssh:3.2.2:*:*:*:*:*:*:*
openbsd openssh 3.2.2p1 cpe:2.3:a:openbsd:openssh:3.2.2p1:*:*:*:*:*:*:*
openbsd openssh 3.2.3p1 cpe:2.3:a:openbsd:openssh:3.2.3p1:*:*:*:*:*:*:*
openbsd openssh 3.3 cpe:2.3:a:openbsd:openssh:3.3:*:*:*:*:*:*:*
openbsd openssh 3.3p1 cpe:2.3:a:openbsd:openssh:3.3p1:*:*:*:*:*:*:*
openbsd openssh 3.4 cpe:2.3:a:openbsd:openssh:3.4:*:*:*:*:*:*:*
openbsd openssh 3.4p1 cpe:2.3:a:openbsd:openssh:3.4p1:*:*:*:*:*:*:*
openbsd openssh 3.5 cpe:2.3:a:openbsd:openssh:3.5:*:*:*:*:*:*:*
openbsd openssh 3.5p1 cpe:2.3:a:openbsd:openssh:3.5p1:*:*:*:*:*:*:*
openbsd openssh 3.6 cpe:2.3:a:openbsd:openssh:3.6:*:*:*:*:*:*:*
openbsd openssh 3.6.1 cpe:2.3:a:openbsd:openssh:3.6.1:*:*:*:*:*:*:*
openbsd openssh 3.6.1p1 cpe:2.3:a:openbsd:openssh:3.6.1p1:*:*:*:*:*:*:*
openbsd openssh 3.6.1p2 cpe:2.3:a:openbsd:openssh:3.6.1p2:*:*:*:*:*:*:*
openbsd openssh 3.7 cpe:2.3:a:openbsd:openssh:3.7:*:*:*:*:*:*:*
openbsd openssh 3.7.1 cpe:2.3:a:openbsd:openssh:3.7.1:*:*:*:*:*:*:*
openbsd openssh 3.7.1p1 cpe:2.3:a:openbsd:openssh:3.7.1p1:*:*:*:*:*:*:*
openbsd openssh 3.7.1p2 cpe:2.3:a:openbsd:openssh:3.7.1p2:*:*:*:*:*:*:*
openbsd openssh 3.8 cpe:2.3:a:openbsd:openssh:3.8:*:*:*:*:*:*:*
openbsd openssh 3.8.1 cpe:2.3:a:openbsd:openssh:3.8.1:*:*:*:*:*:*:*
openbsd openssh 3.8.1p1 cpe:2.3:a:openbsd:openssh:3.8.1p1:*:*:*:*:*:*:*
openbsd openssh 3.9 cpe:2.3:a:openbsd:openssh:3.9:*:*:*:*:*:*:*
openbsd openssh 3.9.1 cpe:2.3:a:openbsd:openssh:3.9.1:*:*:*:*:*:*:*
openbsd openssh 3.9.1p1 cpe:2.3:a:openbsd:openssh:3.9.1p1:*:*:*:*:*:*:*
openbsd openssh 4.0 cpe:2.3:a:openbsd:openssh:4.0:*:*:*:*:*:*:*
openbsd openssh 4.0p1 cpe:2.3:a:openbsd:openssh:4.0p1:*:*:*:*:*:*:*
openbsd openssh 4.1p1 cpe:2.3:a:openbsd:openssh:4.1p1:*:*:*:*:*:*:*
openbsd openssh 4.2 cpe:2.3:a:openbsd:openssh:4.2:*:*:*:*:*:*:*
openbsd openssh 4.2p1 cpe:2.3:a:openbsd:openssh:4.2p1:*:*:*:*:*:*:*
openbsd openssh 4.3 cpe:2.3:a:openbsd:openssh:4.3:*:*:*:*:*:*:*
openbsd openssh 4.3p1 cpe:2.3:a:openbsd:openssh:4.3p1:*:*:*:*:*:*:*

References for CVE-2006-4924

URL Tags
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 Vendor Advisory
http://secunia.com/advisories/22091 Vendor Advisory
http://secunia.com/advisories/22116 Vendor Advisory
http://secunia.com/advisories/22158 Vendor Advisory
http://secunia.com/advisories/22164 Vendor Advisory
http://secunia.com/advisories/22183 Vendor Advisory
http://secunia.com/advisories/22196 Vendor Advisory
http://secunia.com/advisories/22208 Vendor Advisory
http://secunia.com/advisories/22236 Vendor Advisory
http://secunia.com/advisories/22245 Vendor Advisory
http://secunia.com/advisories/22270 Vendor Advisory
http://secunia.com/advisories/22298 Vendor Advisory
http://secunia.com/advisories/22352 Vendor Advisory
http://secunia.com/advisories/22362 Vendor Advisory
http://secunia.com/advisories/22487 Vendor Advisory
http://secunia.com/advisories/22495 Vendor Advisory
http://secunia.com/advisories/22823 Vendor Advisory
http://secunia.com/advisories/22926 Vendor Advisory
http://secunia.com/advisories/23038 Vendor Advisory
http://secunia.com/advisories/23241 Vendor Advisory
http://secunia.com/advisories/23340 Vendor Advisory
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 Patch
http://www.debian.org/security/2006/dsa-1212 Patch
http://www.kb.cert.org/vuls/id/787448 US Government Resource
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 Exploit Patch
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 US Government Resource
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 Patch Vendor Advisory
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
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