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CVE-2013-4421

5.0 · MEDIUM

The buf_decompress function in packet.c in Dropbear SSH Server before 2013.59 allows remote attackers to cause a denial of service (memory consumption) via a compressed packet that has a large size…

Published Oct 25, 2013dropbear_ssh_projectCWE-189EPSS 6.42%

Overview

CVE-2013-4421 is a medium-severity vulnerability affecting dropbear_ssh_project dropbear_ssh. It was published on October 25, 2013 and has a CVSS 2.0 base score of 5.0 (MEDIUM).

This vulnerability has a CVSS 2.0 base score of 5.0, rated MEDIUM. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

The buf_decompress function in packet.c in Dropbear SSH Server before 2013.59 allows remote attackers to cause a denial of service (memory consumption) via a compressed packet that has a large size when it is decompressed.

Remediation

Check the references section for vendor advisories and patches from dropbear_ssh_project. Update dropbear_ssh 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
dropbear_ssh_projectdropbear_ssh>= 0, < 2013.59Affected

References

Reflists.fedoraproject.org/pipermail/package-announce/2013-October/119300.htmlReflists.fedoraproject.org/pipermail/package-announce/2013-October/119323.htmlReflists.opensuse.org/opensuse-updates/2013-10/msg00061.htmlReflists.opensuse.org/opensuse-updates/2013-11/msg00046.htmlRefsecunia.com/advisories/55173Refwww.openwall.com/lists/oss-security/2013/10/11/4Refwww.securityfocus.com/bid/62958Refmatt.ucc.asn.au/dropbear/CHANGESRefsecure.ucc.asn.au/hg/dropbear/rev/0bf76f54de6fRefsupport.citrix.com/article/CTX216642

How CyberStrike helps

Frequently asked questions

What is CVE-2013-4421?

CVE-2013-4421 is a medium-severity vulnerability affecting dropbear_ssh_project dropbear_ssh. It was published on October 25, 2013 and has a CVSS 2.0 base score of 5.0 (MEDIUM).

How severe is CVE-2013-4421?

This vulnerability has a CVSS 2.0 base score of 5.0, rated MEDIUM. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2013-4421?

Check the references section for vendor advisories and patches from dropbear_ssh_project. Update dropbear_ssh 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-2013-4421?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2013-4421 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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