CVE-2013-4434

Name: CVE-2013-4434
Creator: NVD / NIST
Published: 2013-10-25T23:55:03.957+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

UnknownEPSS 5.75%

Last modified Jun 16, 2026

CVE-2013-4434 is a vulnerability of currently unknown severity. Dropbear SSH Server before 2013.59 generates error messages for a failed logon attempt with different time delays depending on whether the user account exists, which allows remote attackers to discover valid usernames.. EPSS estimates a 5.75% chance of exploitation in the next 30 days.

Description

Dropbear SSH Server before 2013.59 generates error messages for a failed logon attempt with different time delays depending on whether the user account exists, which allows remote attackers to discover valid usernames.

Metrics

EPSS Probability

5.75%

92.1th 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.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/55173Vendor Advisory
http://www.openwall.com/lists/oss-security/2013/10/16/11Mailing List, Third Party Advisory
http://www.securityfocus.com/bid/62993Third Party Advisory, VDB Entry
https://matt.ucc.asn.au/dropbear/CHANGESVendor Advisory
https://secure.ucc.asn.au/hg/dropbear/rev/d7784616409aPatch, Third Party Advisory
https://support.citrix.com/article/CTX216642Third 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/55173Vendor Advisory
http://www.openwall.com/lists/oss-security/2013/10/16/11Mailing List, Third Party Advisory
http://www.securityfocus.com/bid/62993Third Party Advisory, VDB Entry
https://matt.ucc.asn.au/dropbear/CHANGESVendor Advisory
https://secure.ucc.asn.au/hg/dropbear/rev/d7784616409aPatch, 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-2013-4434?

How severe is CVE-2013-4434?

Severity scoring for CVE-2013-4434 is pending analysis. The EPSS model estimates a 5.75% probability of exploitation in the next 30 days.

How do I fix CVE-2013-4434?

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-2013-4434?

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

Scan your code now

Source: NVD / NIST