CVE-2013-4421

Name: CVE-2013-4421
Creator: NVD / NIST
Published: 2013-10-25T23:55:03.847+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

UnknownEPSS 6.42%

Last modified Jun 16, 2026

CVE-2013-4421 is a vulnerability of currently unknown severity. 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.. EPSS estimates a 6.42% chance of exploitation in the next 30 days.

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.

Metrics

EPSS Probability

6.42%

92.8th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-189

Affected Software

Vendor	Product	Versions
Dropbear Ssh Project	Dropbear Ssh	< 2013.59

References

http://lists.fedoraproject.org/pipermail/package-announce/2013-October/119300.htmlThird Party Advisory
http://lists.fedoraproject.org/pipermail/package-announce/2013-October/119323.htmlThird Party Advisory
http://lists.opensuse.org/opensuse-updates/2013-10/msg00061.htmlThird Party Advisory
http://lists.opensuse.org/opensuse-updates/2013-11/msg00046.htmlThird Party Advisory
http://secunia.com/advisories/55173Third Party Advisory
http://www.openwall.com/lists/oss-security/2013/10/11/4Mailing List, Third Party Advisory
http://www.securityfocus.com/bid/62958Third Party Advisory, VDB Entry
https://matt.ucc.asn.au/dropbear/CHANGESVendor Advisory
https://secure.ucc.asn.au/hg/dropbear/rev/0bf76f54de6fPatch, Third Party Advisory
https://support.citrix.com/article/CTX216642Third Party Advisory
http://lists.fedoraproject.org/pipermail/package-announce/2013-October/119300.htmlThird Party Advisory
http://lists.fedoraproject.org/pipermail/package-announce/2013-October/119323.htmlThird Party Advisory
http://lists.opensuse.org/opensuse-updates/2013-10/msg00061.htmlThird Party Advisory
http://lists.opensuse.org/opensuse-updates/2013-11/msg00046.htmlThird Party Advisory
http://secunia.com/advisories/55173Third Party Advisory
http://www.openwall.com/lists/oss-security/2013/10/11/4Mailing List, Third Party Advisory
http://www.securityfocus.com/bid/62958Third Party Advisory, VDB Entry
https://matt.ucc.asn.au/dropbear/CHANGESVendor Advisory
https://secure.ucc.asn.au/hg/dropbear/rev/0bf76f54de6fPatch, Third Party Advisory
https://support.citrix.com/article/CTX216642Third Party Advisory

Timeline

Published: Oct 25, 2013
Last Modified: Jun 16, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2013-4421?

How severe is CVE-2013-4421?

Severity scoring for CVE-2013-4421 is pending analysis. The EPSS model estimates a 6.42% probability of exploitation in the next 30 days.

How do I fix CVE-2013-4421?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2013-4421?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST