CVE-2011-5009: 3ssoftware Codesys

Medium severity, CVSS 5.0. EPSS: 10.4% chance of exploitation in the next 30 days.

The CmpWebServer.dll module in the Control service in 3S CoDeSys 3.4 SP4 Patch 2 allows remote attackers to cause a denial of service (NULL pointer dereference) via (1) a crafted Content-Length in an HTTP POST or (2) an invalid HTTP request method.

Affected products

• 3ssoftware Codesys: version 3.4 only

Published 2011-12-25. Last modified 2026-06-16.