CVE-2013-4434
Dropbear SSH Server before 2013.59 generates error messages for a failed logon attempt with different time delays depending on whether the user account...
- Published
- Oct 25, 2013
- Updated
- Aug 6, 2024
- Assigning CNA
- redhat
- Evidence observed
- Aug 4, 2026
Primary CVSS
nvd · CVSS 2.0
AV:N/AC:L/Au:N/C:P/I:N/A:NLow · next 30 days
- Percentile
- 93.0%
- Model date
- Oct 16, 2026
EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.
Summary
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.
Sources
Dropbear user enumeration (CVE-2013-4434) PoC
Responsible use
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