CVE-2011-3321

highpriority · track · 39EPSS 0.071 · 94 %ileEUUS

grimoire priorityP2 · Scheduled

Exploitable?

—

no known exploitation

Likely / severe?

7.07% (94th) EPSS

CVSS 9.3 · high

Is it mine?

7 products

Check your exposure

Who says so?

4 sources

cnnvd · enisa_euvd · cisa_csaf_ot · nvd

EPSS · scored 2026-10-28

Heap-based buffer overflow in the Siemens WinCC Runtime Advanced Loader, as used in SIMATIC WinCC flexible Runtime and SIMATIC WinCC (TIA Portal) Runtime Advanced, allows remote attackers to cause a denial of service (memory corruption) or possibly execute arbitrary code via a crafted packet to TCP port 2308.

remediations

Vendor fix, mitigation, or workaround guidance, as published by each source.

No vendor fix yet; a mitigation is available.

MitigationSiemens SIMATIC WinCC (TIA Portal) Runtime Advancedcisa_csaf_ot
Siemens currently has no plans to patch this vulnerability. The WinCC flexible Runtime Loader and WinCC (TIA Portal) Runtime Advanced Loader feature is disabled by default and is only used when updating firmware. Siemens has updated the product documentation to advise users to disable this feature except when it is actively being used.
MitigationSiemens SIMATIC WinCC flexible Runtimecisa_csaf_ot
Siemens currently has no plans to patch this vulnerability. The WinCC flexible Runtime Loader and WinCC (TIA Portal) Runtime Advanced Loader feature is disabled by default and is only used when updating firmware. Siemens has updated the product documentation to advise users to disable this feature except when it is actively being used.

cvss

Technical severity, 0–10. One row per scoring source.

9.3

010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · high–critical · 7.9–9.3

v2.09.3highAV:N/AC:M/Au:N/C:C/I:C/A:Cprimary · NVD / NIST USexploitability 8.6 · impact 10

v2.09.3criticalAV:N/AC:M/Au:N/C:C/I:C/A:Csecondary · CISA US

v2.07.9highAV:N/AC:M/Au:N/C:C/I:C/A:C/E:Usecondary · CVSS-BT (t0sche)

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-119USprimaryCWE-119US

affected products (7)

Products and version ranges known to be affected.

Siemens Siemens SIMATIC WinCC (TIA Portal) Runtime Advanced: vers:all/*all versionscisa_csaf_otUS
Siemens Siemens SIMATIC WinCC flexible Runtime: vers:all/*all versionscisa_csaf_otUS
Siemens Siemens SIMATIC WinCC (TIA Portal) Runtime Advanced≤ vers:all/*cisa_csaf_otUS
Siemens Siemens SIMATIC WinCC flexible Runtime≤ vers:all/*cisa_csaf_otUS
n/a n/a≤ n/aenisa_euvdEU
siemens simatic wincc flexible runtimeall versionsnvdUScpe:2.3:a:siemens:simatic_wincc_flexible_runtime:*:*:*:*:*:*:*:*
siemens simatic wincc runtimeall versionsnvdUScpe:2.3:a:siemens:simatic_wincc_runtime:*:*:*:*:*:*:*:*

advisories (1)

Vendor and ecosystem advisories describing this.

ICSA-11-244-01Siemens WinCC Flexible Runtime Heap Overflow2011-06-04icsa · cisa_csaf_otUS
This CSAF advisory was extracted from unstructured data and may contain inaccuracies. If you notice any errors, please reach out to the designated contact at CISA CSAF: central@cisa.dhs.gov

also known as (3)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd cisa_csaf_ot nvd NVD CVE.org MITRE

published 2011-09-16modified 2026-06-16

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+21039 more

references (14)

External citations — patches, advisories, analysis.

scry

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