CVE-2009-3023
CVE-2009-3023 is a CWE-120 vulnerability in microsoft internet information server. 7 public exploit references exist, so weaponization risk is real. O3 Security detects and blocks CVE-2009-3023 exploitation at runtime via eBPF exploit-chain detection and L7 egress monitoring, even on unpatched systems.
Buffer overflow in the FTP Service in Microsoft Internet Information Services (IIS) 5.0 through 6.0 allows remote authenticated users to execute arbitrary code via a crafted NLST (NAME…
EPSS Exploitation Probability
EPSS (Exploit Prediction Scoring System) is a daily probability model maintained by FIRST.org. It estimates the likelihood a CVE will be exploited in production environments within the next 30 days, derived from real-world threat intelligence signals.
Description
Buffer overflow in the FTP Service in Microsoft Internet Information Services (IIS) 5.0 through 6.0 allows remote authenticated users to execute arbitrary code via a crafted NLST (NAME LIST) command that uses wildcards, leading to memory corruption, aka "IIS FTP Service RCE and DoS Vulnerability."
Affected Products
internet information servermicrosoftResearch use only. For defensive security, authorized penetration testing, and academic research only. Never execute exploit code against systems without explicit written authorization.
Microsoft IIS 5.0 FTP Server (Windows 2000 SP4) - Remote Stack Overflow
by muts · Sep 1, 2009
Microsoft IIS FTP Server - NLST Response Overflow (MS09-053) (Metasploit)
by Metasploit · Nov 12, 2010
Microsoft IIS 5.0/6.0 FTP Server (Windows 2000) - Remote Stack Overflow
by kingcope · Aug 31, 2009
Detection & mitigation playbook
Vendor / applianceDetect
Inventory every microsoft internet information server 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.
Remediation status
No patch has shipped for CVE-2009-3023 yet — track the microsoft internet information server advisory for a fixed release and apply the workarounds below in the meantime.
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.
How O3 protects you
O3 detects and blocks CVE-2009-3023 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-2009-3023. Runtime protection reduces exposure until a permanent patch is applied and verified — it complements patching, it doesn't replace it.
Frequently Asked Questions
Is CVE-2009-3023 being exploited in your environment?
O3's eBPF runtime sensors and L7 egress monitoring detect and block the CVE-2009-3023 exploit chain at execution — protecting unpatched and end-of-life systems until the vendor patch is applied.