CVE-2013-4434
Dropbear SSH Server before 2013.59 generates error messages for a failed logon attempt with...
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.
Exploit likelihood
What each source reports
NVD Score used
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.
- Record
CVE-2013-4434- CVSS 2.0
- 5.0 Medium
AV:N/AC:L/Au:N/C:P/I:N/A:N - Weakness
- CWE-189
- Updated
- 2026-11-02
CVE List No score
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.
- Record
CVE-2013-4434- Updated
- 2026-11-02
EUVDEUVD-2013-4311 No score
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.
- Record
EUVD-2013-4311- Updated
- 2026-11-03
GitHub AdvisoriesGHSA-7j5m-wjm2-xppv No score
Dropbear SSH Server before 2013.59 generates error messages for a failed logon attempt with...
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.
- Record
GHSA-7j5m-wjm2-xppv- Updated
- 2026-11-02
OSV No score
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.
- Record
CVE-2013-4434- Updated
- 2026-11-02
OSVDEBIAN-CVE-2013-4434 No score
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.
- Record
DEBIAN-CVE-2013-4434- Updated
- 2026-11-02
OSVMGASA-2013-0318 No score
Updated dropbear packages fix CVE-2013-4421
Updated dropbear package fixes security vulnerability:
Possible memory exhaustion denial of service due to the size of decompressed payloads in dropbear before 2013.59 (CVE-2013-4421).
Inconsistent delays in authorization failures could be used to disclose the existence of valid user accounts in dropbear before 2013.59 (CVE-2013-4434).
- Record
MGASA-2013-0318- Updated
- 2026-11-02
OSVUBUNTU-CVE-2013-4434 No score
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.
- Record
UBUNTU-CVE-2013-4434- Updated
- 2026-11-02
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
dropbearDebian:12 |
before 2012.55-1.4 | 2012.55-1.4 |
dropbearDebian:13 |
before 2012.55-1.4 | 2012.55-1.4 |
dropbearDebian:14 |
before 2012.55-1.4 | 2012.55-1.4 |
dropbearMageia:2 From an advisory covering 2 CVEs |
before 2013.59-1.mga2 | 2013.59-1.mga2 |
dropbearMageia:3 From an advisory covering 2 CVEs |
before 2013.59-1.mga3 | 2013.59-1.mga3 |
Public exploits
Links only. Every CVE stores no exploit code.
| Source | Link | Date |
|---|---|---|
| PoC in GitHub | styx00/Dropbear_CVE-2013-4434 | 2016-03-20 |
History
| Recorded | Changed | Sources |
|---|---|---|
| affected, facts | ||
| affected | ||
| aliases | EUVD | |
| first indexed | CVE List, GitHub Advisories, NVD, OSV, PoC in GitHub |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2013-4434 is a medium vulnerability (CVSS 5.0) in Dropbear Ssh Project Ssh, published October 25, 2013. Public exploit code exists. EPSS puts the chance of exploitation in the next 30 days at 5.75%, the 93rd percentile. Fixed in dropbear 2012.55-1.4.
References
secunia.com/advisories/55173
matt.ucc.asn.au/dropbear/CHANGES
securityfocus.com/bid/62993
openwall.com/lists/oss-security/2013/10/16/11
lists.opensuse.org/opensuse-updates/2013-11/msg00046.html
support.citrix.com/article/CTX216642
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secure.ucc.asn.au/hg/dropbear/rev/d7784616409a
nvd.nist.gov/vuln/detail/CVE-2013-4434
github.com/advisories/GHSA-7j5m-wjm2-xppv
security-tracker.debian.org/tracker/CVE-2013-4434
advisories.mageia.org/MGASA-2013-0318.html
openwall.com/lists/oss-security/2013/10/11/4
bugs.mageia.org/show_bug.cgi?id=11442
ubuntu.com/security/CVE-2013-4434
cve.org/CVERecord?id=CVE-2013-4434