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Vulnerability record · CVE-2013-4434 · published 25 October 2013

CVE-2013-4434: Dropbear ssh project dropbear ssh vulnerability

DDropbear Ssh Project · Dropbear Ssh

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.

5.0 CVSS 2.0 Medium EPSS 5.7% · top 7.2% CWE-189 · CWE-189
5.0CVSS 2.0 base score
5.7%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
16References
16 Jun 2026Last modified by NVD

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.

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

Affected products

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

References

LinkTags
http://lists.opensuse.org/opensuse-updates/2013-10/msg00061.html Third Party Advisory
http://lists.opensuse.org/opensuse-updates/2013-11/msg00046.html Third Party Advisory
http://secunia.com/advisories/55173 Vendor Advisory
http://www.openwall.com/lists/oss-security/2013/10/16/11 Mailing ListThird Party Advisory
http://www.securityfocus.com/bid/62993 Third Party AdvisoryVDB Entry
https://matt.ucc.asn.au/dropbear/CHANGES Vendor Advisory
https://secure.ucc.asn.au/hg/dropbear/rev/d7784616409a PatchThird Party Advisory
https://support.citrix.com/article/CTX216642 Third Party Advisory
http://lists.opensuse.org/opensuse-updates/2013-10/msg00061.html Third Party Advisory
http://lists.opensuse.org/opensuse-updates/2013-11/msg00046.html Third Party Advisory
http://secunia.com/advisories/55173 Vendor Advisory
http://www.openwall.com/lists/oss-security/2013/10/16/11 Mailing ListThird Party Advisory
http://www.securityfocus.com/bid/62993 Third Party AdvisoryVDB Entry
https://matt.ucc.asn.au/dropbear/CHANGES Vendor Advisory
https://secure.ucc.asn.au/hg/dropbear/rev/d7784616409a PatchThird Party Advisory
https://support.citrix.com/article/CTX216642 Third Party Advisory

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Related vulnerabilities

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

9.8CVE-2016-7406Dropbear ssh project dropbear ssh improper input validation vulnerabilityFormat string vulnerability in Dropbear SSH before 2016.74 allows remote attackers to execute arbitrary code via format string specifiers in the (1) …EPSS 10%9.8CVE-2016-7407Dropbear ssh project dropbear ssh improper input validation vulnerabilityThe dropbearconvert command in Dropbear SSH before 2016.74 allows attackers to execute arbitrary code via a crafted OpenSSH key file.EPSS 5.8%8.8CVE-2017-9078Dropbear ssh project dropbear ssh double free vulnerabilityThe server in Dropbear before 2017.75 might allow post-authentication root remote code execution because of a double free in cleanup of TCP listeners…EPSS 5.7%8.8CVE-2016-7408Dropbear ssh project dropbear ssh improper access control vulnerabilityThe dbclient in Dropbear SSH before 2016.74 allows remote attackers to execute arbitrary code via a crafted (1) -m or (2) -c argument.EPSS 4.3%8.1CVE-2020-36254Dropbear ssh project dropbear ssh vulnerabilityscp.c in Dropbear before 2020.79 mishandles the filename of . or an empty filename, a related issue to CVE-2018-20685.EPSS 1.9%7.5CVE-2021-36369Dropbear ssh project dropbear ssh improper authentication vulnerabilityAn issue was discovered in Dropbear through 2020.81. Due to a non-RFC-compliant check of the available authentication methods in the client-side SSH …EPSS 1.5%7.5CVE-2017-2659Dropbear ssh project dropbear ssh error message information leak vulnerabilityIt was found that dropbear before version 2013.59 with GSSAPI leaks whether given username is valid or invalid. When an invalid username is given, th…EPSS 1.5%7.5CVE-2007-1099Dropbear ssh project dropbear ssh vulnerabilitydbclient in Dropbear SSH client before 0.49 does not sufficiently warn the user when it detects a hostkey mismatch, which might allow remote attacker…EPSS 2.2%

Source: NIST National Vulnerability Database (record CVE-2013-4434), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.