What is CVE-2006-0743?

CVE-2006-0743 is a medium-severity security vulnerability in log4net (nuget), affecting versions <= 1.2.9. It is fixed in 1.2.10.

Which versions of log4net are affected by CVE-2006-0743?

log4net (nuget) versions <= 1.2.9 is affected.

Is there a fix for CVE-2006-0743?

Yes. CVE-2006-0743 is fixed in 1.2.10. Upgrade to this version or later.

Is CVE-2006-0743 exploitable, and should I be worried?

Whether CVE-2006-0743 is exploitable in your environment depends on whether the vulnerable code is present and reachable. A CVSS score is a worst-case rating; it does not account for your specific deployment, configuration, or usage patterns. Kodem, an Intelligent Application Security platform, uses runtime intelligence to show which vulnerabilities actually execute in production, so you can focus on the ones that represent real risk.

What actually determines whether CVE-2006-0743 is exploitable, and how bad it is?

Exploitability and impact are not fixed properties of a CVE. They depend on runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A high CVSS score on a dependency that never runs is not the same as real risk. Kodem, an Intelligent Application Security platform, uses runtime intelligence to reveal which vulnerabilities actually execute in production, so teams prioritize the ones that genuinely matter.

CVE-2006-0743 in log4net | Intelligent Application Security

Q: Which versions of log4net are affected by CVE-2006-0743?

log4net (nuget) versions <= 1.2.9 is affected.

Q: Is there a fix for CVE-2006-0743?

Yes. CVE-2006-0743 is fixed in 1.2.10. Upgrade to this version or later.

Q: Is CVE-2006-0743 exploitable, and should I be worried?

Whether CVE-2006-0743 is exploitable in your environment depends on whether the vulnerable code is present and reachable. A CVSS score is a worst-case rating; it does not account for your specific deployment, configuration, or usage patterns. Kodem, an Intelligent Application Security platform, uses runtime intelligence to show which vulnerabilities actually execute in production, so you can focus on the ones that represent real risk.

Q: What actually determines whether CVE-2006-0743 is exploitable, and how bad it is?

Exploitability and impact are not fixed properties of a CVE. They depend on runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A high CVSS score on a dependency that never runs is not the same as real risk. Kodem, an Intelligent Application Security platform, uses runtime intelligence to reveal which vulnerabilities actually execute in production, so teams prioritize the ones that genuinely matter.

Q: How do I fix CVE-2006-0743?

Upgrade log4net to 1.2.10 or later.

Summary

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.

Impact

Affected versions

log4net (<= 1.2.9)

Security releases

log4net → 1.2.10 (nuget)

Kodem intelligence

Severity tells you how bad this could be in the worst case. It does not tell you whether you are exposed. Exploitability and impact are functions of runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A vulnerable package can sit in your dependency tree and never run.

Kodem, an Intelligent Application Security platform, uses runtime intelligence to reveal which vulnerabilities actually execute in production, so teams prioritize the ones that genuinely matter. Kodem's runtime-powered SCA identifies whether this CVE is reachable in your applications.

See it in your environment

Remediation advice

Upgrade log4net to 1.2.10 or later to resolve this vulnerability.

Kodem Kai can prioritize this vulnerability in your dependency tree and generate a fix recommendation.

Frequently Asked Questions

What is CVE-2006-0743? CVE-2006-0743 is a medium-severity security vulnerability in log4net (nuget), affecting versions <= 1.2.9. It is fixed in 1.2.10.
Which versions of log4net are affected by CVE-2006-0743? log4net (nuget) versions <= 1.2.9 is affected.
Is there a fix for CVE-2006-0743? Yes. CVE-2006-0743 is fixed in 1.2.10. Upgrade to this version or later.
Is CVE-2006-0743 exploitable, and should I be worried? Whether CVE-2006-0743 is exploitable in your environment depends on whether the vulnerable code is present and reachable. A CVSS score is a worst-case rating; it does not account for your specific deployment, configuration, or usage patterns. Kodem, an Intelligent Application Security platform, uses runtime intelligence to show which vulnerabilities actually execute in production, so you can focus on the ones that represent real risk. Get a demo
What actually determines whether CVE-2006-0743 is exploitable, and how bad it is? Exploitability and impact are not fixed properties of a CVE. They depend on runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A high CVSS score on a dependency that never runs is not the same as real risk. Kodem, an Intelligent Application Security platform, uses runtime intelligence to reveal which vulnerabilities actually execute in production, so teams prioritize the ones that genuinely matter.
How do I fix CVE-2006-0743? Upgrade log4net to 1.2.10 or later.

Other vulnerabilities in log4net

CVE-2006-0743 CVE-2018-1285