Is CVE-2013-4434 in the CISA KEV catalog?

No. CVE-2013-4434 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2013-4434?

CVE-2013-4434 has a CVSS v2 base score of 5.0 (MEDIUM).

What is the EPSS score for CVE-2013-4434?

CVE-2013-4434 has an EPSS score of 5.75% (92th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2013-4434?

Upgrade dropbear on debian 11 to 2012.55-1.4 or later.

CVE & CISA-KEV Catalog

CVE-2013-4434

MEDIUMEPSS 92th pctl

5.0

CVSS v2

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.

CWE-189

How to fix

Remediation Available

dropbearDebian

Fixed in:2012.55-1.4CVE-2013-4434

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v2 Vector

No CVSS vector data available.

Exploit Intelligence

5.75%probability of exploitation in 30 days

92ndpercentile

High risk: more likely to be exploited than 92% of all known CVEs.

References

Patch1

secure.ucc.asn.au

Vendor Advisory2

Third-Party Advisory5

Related Vulnerabilities

Other CWE-189 vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2015-1538	High	10.0	99%	-	-
CVE-2006-3747	High	7.6	96%	-	Fix
CVE-2007-0071	High	9.3	93%	-	-
CVE-2015-3829	High	10.0	90%	-	-
CVE-2015-3864	High	10.0	87%	-	-
CVE-2015-1539	High	10.0	86%	-	-

Embed a live status badge for CVE-2013-4434

Markdown

[![CVE-2013-4434](https://tridentstack.com/cve/badge/CVE-2013-4434.svg)](https://tridentstack.com/cve/CVE-2013-4434)

HTML

<a href="https://tridentstack.com/cve/CVE-2013-4434"><img src="https://tridentstack.com/cve/badge/CVE-2013-4434.svg" alt="CVE-2013-4434"></a>

Find and fix vulnerabilities across your fleet

TridentStack Control continuously scans your Windows, macOS, and Linux fleet for known vulnerabilities, prioritizes them by severity and active exploitation, and patches them automatically.

Start free

This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-04-29.