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CVE-2006-0743

CVE-2006-0743 is a CWE-134 vulnerability in apache log4net. O3 Security detects and blocks CVE-2006-0743 exploitation at runtime via eBPF exploit-chain detection and L7 egress monitoring, even on unpatched systems.

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
Mar 9, 2006
Updated
Jun 16, 2026
Affected
0 pkgs
Patched
None yet
Exploits
None indexed

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.

Affected Products

1 product · 1 configurations
Application
log4netapache
1 version
1.2.9_beta

Detection & mitigation playbook

Vendor / appliance
  1. Detect

    Inventory every apache log4net deployment and check each version against the affected-products list above. Because the exploit targets the running system rather than your application code, also watch for remote code execution at the network and runtime layer — O3 flags the exploit behaviour from runtime telemetry and egress traffic even before a vulnerable build is confirmed.

  2. Remediation status

    No patch has shipped for CVE-2006-0743 yet — track the apache log4net advisory for a fixed release and apply the workarounds below in the meantime.

  3. Mitigate without a patch

    Cut exposure now: restrict the management/admin interface to trusted networks, segment the device, and apply the vendor's recommended configuration mitigations and any WAF/IPS signature. O3's runtime protection blocks the exploit chain at execution, holding the line on unpatched or end-of-life systems until you can patch.

  4. How O3 protects you

    O3 detects and blocks CVE-2006-0743 exploitation at runtime: eBPF exploit-chain detection, plus L7 egress monitoring that catches the post-exploitation callback and severs the attacker's outbound channel.

Tailored to CVE-2006-0743. Runtime protection reduces exposure until a permanent patch is applied and verified — it complements patching, it doesn't replace it.

Frequently Asked Questions

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.
O3 Security · Runtime Protection

Is CVE-2006-0743 being exploited in your environment?

O3's eBPF runtime sensors and L7 egress monitoring detect and block the CVE-2006-0743 exploit chain at execution — protecting unpatched and end-of-life systems until the vendor patch is applied.