CVE-2011-5009

medium

Published 2011-12-25 · Modified 2026-04-29

💬 Discuss on Community ✚ Propose mitigation

CVSS v3

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CVSS v4 NEW

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not yet in upstream

VIR risk

6.0

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.

Predictions

Exploit likelihood

20%

Patch ETA

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Heuristic predictions, AS-IS, for prioritization only.

Mitigations

No mitigations published for this CVE yet.

The vendor-content worker queues fetches as references arrive (check back in a few minutes). Or — if you've already worked around this in production — publish your fix to the community-verified tier.

✚ Propose a mitigation on Community → Mitigations published via the community go through AI scoring + 2 human reviewers + 7-day silent objection window before landing here with source_tier=community-verified.

Exploits

Public proof-of-concept code below. AS-IS, for defenders and authorised testing only.

Exploit-DB

EDB-36378 dos multiple verified

Luigi Auriemma · 2011-11-30

CoDeSys 3.4 - Null Pointer Invalid HTTP Request Parsing Remote Denial of Service

Source code queued for fetch — refresh in a moment.

EDB-36377 dos multiple verified

Luigi Auriemma · 2011-11-30

CoDeSys 3.4 - POST Null Pointer Content-Length Parsing Remote Denial of Service

Source code queued for fetch — refresh in a moment.

Application impact

Vendor	Product	Versions	Fixed
3ssoftware	codesys	`3.4`

References

Community-verified mitigations for this CVE will appear above when contributors publish them.

Verify integrity in audit chain (admin only). AS-IS.