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Vulnerability record · CVE-2006-4924 · published 27 September 2006

CVE-2006-4924: Openbsd openssh vulnerability

Openbsd · Openssh

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.

7.8 CVSS 2.0 High EPSS 38% · top 1.5% CWE-399 · CWE-399
7.8CVSS 2.0 base score
38%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
158References, 2 tagged exploit
16 Jun 2026Last modified by NVD

Description

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.

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

Affected products

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

References

LinkTags
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

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Related vulnerabilities

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

10.0CVE-2003-0786Openbsd openssh vulnerabilityThe SSH1 PAM challenge response authentication in OpenSSH 3.7.1 and 3.7.1p1, when Privilege Separation is disabled, does not check the result of the …EPSS 3.6%10.0CVE-2003-0693Openbsd openssh vulnerabilityA "buffer management error" in buffer_append_space of buffer.c for OpenSSH before 3.7 may allow remote attackers to execute arbitrary code by causing…EPSS 11%10.0CVE-2002-0640Openbsd openssh vulnerabilityBuffer overflow in sshd in OpenSSH 2.3.1 through 3.3 may allow remote attackers to execute arbitrary code via a large number of responses during chal…EPSS 27%10.0CVE-2001-0144Openbsd openssh vulnerabilityCORE SDI SSH1 CRC-32 compensation attack detector allows remote attackers to execute arbitrary commands on an SSH server or client via an integer ove…EPSS 32%10.0CVE-2000-0999Openbsd openssh vulnerabilityFormat string vulnerabilities in OpenBSD ssh program (and possibly other BSD-based operating systems) allow attackers to gain root privileges.EPSS 12%10.0CVE-2000-0525Openbsd openssh vulnerabilityOpenSSH does not properly drop privileges when the UseLogin option is enabled, which allows local users to execute arbitrary commands by providing th…EPSS 2.6%9.8CVE-2023-38408OpenSSH ssh-agent PKCS#11 search path flaw enables RCE via agent forwardingThe PKCS#11 support in ssh-agent in OpenSSH before 9.3p2 uses an insufficiently trustworthy search path, so code loaded from locations such as /usr/l…EPSS 80%analysed9.8CVE-2023-28531Openbsd openssh improper access control vulnerabilityssh-add in OpenSSH before 9.3 adds smartcard keys to ssh-agent without the intended per-hop destination constraints. The earliest affected version is…EPSS 2.3%

Source: NIST National Vulnerability Database (record CVE-2006-4924), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.