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CVE-2006-4924

7.8 · HIGH

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…

Published Sep 27, 2006openbsdCWE-399EPSS 37.54%

Overview

CVE-2006-4924 is a high-severity vulnerability affecting openbsd openssh. It was published on September 27, 2006 and has a CVSS 2.0 base score of 7.8 (HIGH).

This vulnerability has a CVSS 2.0 base score of 7.8, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories and patches from openbsd. Update openssh to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

Affected products

VendorProductVersionsStatus

References

Refftp://ftp.freebsd.org/pub/FreeBSD/CERT/advisories/FreeBSD-SA-06:22.openssh.ascRefftp://ftp.sco.com/pub/unixware7/714/security/p534336/p534336.txtRefftp://patches.sgi.com/support/free/security/advisories/20061001-01-P.ascRefblogs.sun.com/security/entry/sun_alert_102962_security_vulnerabilityRefbugs.gentoo.org/show_bug.cgi?id=148228Refdocs.info.apple.com/article.html?artnum=305214Refitrc.hp.com/service/cki/docDisplay.do?docId=c00815112Reflists.apple.com/archives/security-announce/2007/Mar/msg00002.htmlRefmarc.info/?l=openssh-unix-dev&m=115939141729160&w=2Refsecunia.com/advisories/21923

How CyberStrike helps

Frequently asked questions

What is CVE-2006-4924?

CVE-2006-4924 is a high-severity vulnerability affecting openbsd openssh. It was published on September 27, 2006 and has a CVSS 2.0 base score of 7.8 (HIGH).

How severe is CVE-2006-4924?

This vulnerability has a CVSS 2.0 base score of 7.8, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2006-4924?

Check the references section for vendor advisories and patches from openbsd. Update openssh to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2006-4924?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2006-4924 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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