CVE-2011-5009

CVE-2011-5009 is a medium-severity vulnerability in 3ssoftware Codesys with a CVSS 2.0 base score of 5.0. Its EPSS exploit-prediction score of 11% places it in the 95th percentile, indicating an elevated likelihood of exploitation.

Key facts

Description

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.

Frequently asked questions

What is CVE-2011-5009?
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.
How severe is CVE-2011-5009?
CVE-2011-5009 has a CVSS 2.0 base score of 5.0, rated medium severity.
Is CVE-2011-5009 being actively exploited?
It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 11% (95th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2011-5009?
CVE-2011-5009 affects 3ssoftware Codesys. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2011-5009?
Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2011-5009 published?
CVE-2011-5009 was published on 2011-12-25 and last updated on 2026-06-16.

References

Affected products (1)

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