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CVE-2013-4434

18
FAUCET Score

CVE-2013-4434 describes a username enumeration vulnerability in Dropbear SSH Server versions prior to 2013.59. This flaw allows remote attackers to determine valid usernames by observing varying time delays in error messages for failed login attempts. With a CVSS score of 5.0 (medium severity), this vulnerability has a low attack complexity and could lead to information disclosure (C:P), but does not impact integrity or availability. There is no evidence of active exploitation, public exploit code, or significant community discussion surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
< 2013.59CPE matchmatch criteria
cpe:2.3:a:dropbear_ssh_project:dropbear_ssh:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 2.0

5.0MEDIUM

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

Confidentiality Impact
PARTIAL
Integrity Impact
NONE
Availability Impact
NONE
Access Vector
NETWORK
Access Complexity
LOW
Authentication
NONE
Exploitability Score
10.0
Impact Score
2.9
CvssVersion
2.0

Exploit Intelligence

EPSS Score
5.75%
Probability of exploitation in next 30 days
EPSS Percentile
92.3%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0575 is in the 89th percentile among its peer group of 23,723 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.0 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Remediation records are not available for this CVE.

References

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