THREATPORT/VULNERABILITY/CVE-2011-5009
MEDIUM SEVERITY

CVE-2011-5009

Codesys vulnerability

CVSS
5.0
EPSS
10.8%
EPSS pct
95th
Exploited
No known
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 vendor
3ssoftware
Affected product
Codesys
CVSS vector
AV:N/AC:L/Au:N/C:N/I:N/A:P
Published
2011-12-25

Risk analysis

Based on its CVSS vector, this vulnerability is exploitable over the network, low attack complexity, requiring no authentication. Successful exploitation leads to partial impact to availability.

Its EPSS score of 10.8% reflects a moderate probability of exploitation activity in the wild over the next 30 days, placing it above 95% of all scored CVEs.

Check your external exposure to CVE-2011-5009

  • Confirm whether 3ssoftware Codesys is running on any internet-facing host or subdomain.
  • Match discovered service fingerprints against the version affected by CVE-2011-5009.
  • Prioritise remediation if the asset is public, business-critical, or near authentication/payment flows.

How ThreatPort helps with CVE-2011-5009

ThreatPort's external attack surface scanner checks your internet-facing assets — agentlessly, from the outside in — for the exposed services and versions that CVE-2011-5009 affects, then prioritises the finding by real risk using CISA KEV and FIRST.org EPSS.

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Are you exposed to CVE-2011-5009?

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