CVE-2006-0743

Format string vulnerability in LocalSyslogAppender in Apache log4net 1.2.9 might allow remote attackers to cause a denial of service (memory corruption and termination) via unknown vectors.

Published: 2006-03-09 Last update: 2026-06-16 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2006-0743 is rated Moderate Risk (54.2/100): CVSS Medium severity, with high exploitation likelihood (EPSS 6.22%, 93th percentile). EPSS ranks this CVE among the most likely to be exploited in the near term. EPSS rose +1.76% over the last day, indicating growing attacker interest. High exploitation likelihood—assess exposure and prioritize remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2006-0743

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-15 4.47% 6.22% +1.76%
2 2026-04-07 4.58% 4.47% -0.11%
3 2025-12-05 — 4.58% —

Full EPSS history (14 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2006-0743

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
5.0 2.0 MEDIUM
AV:N/AC:L/Au:N/C:N/I:N/A:P Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:L)
Exploitation conditions are straightforward and predictable.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:N)
No confidentiality impact.
Integrity impact (I:N)
No integrity impact.
Availability impact (A:P)
Partial availability impact.
 10.0 2.9 [email protected]

Weakness enumeration for CVE-2006-0743

GitHub Security Advisory for CVE-2006-0743

GHSA-f9fr-w54q-772h · Severity: medium · Ecosystem: nuget — Apache log4net format string vulnerability causes DoS

OS Trackers for CVE-2006-0743

vendor priority summary link
redhat — — https://access.redhat.com/security/cve/CVE-2006-0743

Vendor comments (NVD) for CVE-2006-0743

  • Red Hat (2006-11-22T00:00:00)

    Not vulnerable. Red Hat Enterprise Linux 2.1, 3, and 4 do not include log4net.

Affected software / configurations for CVE-2006-0743

Vendor Product Version Raw CPE
apache log4net 1.2.9_beta cpe:2.3:a:apache:log4net:1.2.9_beta:*:*:*:*:*:*:*

References for CVE-2006-0743

cvelogic Threat Intelligence