CVE-2013-4434: dropbear_ssh_project dropbear_ssh Numeric Errors
Vulnerability summary
CVE-2013-4434 is a medium (CVSS 5.0) Numeric Errors vulnerability in dropbear_ssh_project dropbear_ssh. EPSS estimates a 5.75% chance of exploitation in the next 30 days, higher than 93% of scored vulnerabilities.
Not severe (CVSS 5, network access); no exploitation reported by the 5 checked sources
Source freshness unavailable
How is this decided?Advisory lineage
Upstream 0 · Downstream 1Timeline
- 25-10-2013PublishedVulnerability first disclosed.
- 06-08-2024Last modifiedVulnerability information updated.
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.
CVSS metrics
1 score · 1 source · 1 versionEPSS trend
Probability
5.75%
Chance of exploitation in the next 30 days
Percentile
93%
Versus all other CVEs
30-day change
No change 0.00 pp
From 5.75% on 04-10-2026
Known exploited
Compare KEV catalogs
CISA KEVNot in the CISA KEV catalog.
ENISA CNWNot in the ENISA CNW catalog.
CIRCLNot in the CIRCL catalog.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Known conditions: network-reachable, no authentication (CVSS vector). Other conditions: not stated in public data.
Debian1 product
- dropbear< 2012.55-1.4
Dropbear_ssh_project1 product
- dropbear_ssh< 2013.59
Ubuntu1 product
- dropbear< 2013.60-1ubuntu2
3 vendors · 3 products
References
11 links- lists.opensuse.org/opensuse-updates/2013-11/msg00046.htmlVendor AdvisoryX Refsource SUSEThird Party Advisory
- lists.opensuse.org/opensuse-updates/2013-10/msg00061.htmlVendor AdvisoryX Refsource SUSEThird Party Advisory
