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Vulnerability record · CVE-2011-3321 · published 16 September 2011

CVE-2011-3321: Siemens simatic wincc flexible runtime memory buffer overflow vulnerability

Siemens · Simatic Wincc Flexible Runtime

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.

9.3 CVSS 2.0 High EPSS 7.1% · top 6.0% CWE-119 · Memory buffer overflow
9.3CVSS 2.0 base score
7.1%EPSS exploitation probability, 30 days
NoNot in CISA KEV
2Affected product versions listed by NVD
10References
16 Jun 2026Last modified by NVD

Description

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.

AV:N/AC:M/Au:N/C:C/I:C/A:C

Affected products

2 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
http://cache.automation.siemens.com/dnl/jI/jI0NDY5AAAA_29054992_FAQ/Siemens_Security_Advisory_SSA-460621_V1_2.pdf
http://secunia.com/advisories/46011 Vendor Advisory
http://support.automation.siemens.com/WW/view/en/29054992
http://www.us-cert.gov/control_systems/pdf/ICSA-11-244-01.pdf US Government Resource
https://exchange.xforce.ibmcloud.com/vulnerabilities/69803
http://cache.automation.siemens.com/dnl/jI/jI0NDY5AAAA_29054992_FAQ/Siemens_Security_Advisory_SSA-460621_V1_2.pdf
http://secunia.com/advisories/46011 Vendor Advisory
http://support.automation.siemens.com/WW/view/en/29054992
http://www.us-cert.gov/control_systems/pdf/ICSA-11-244-01.pdf US Government Resource
https://exchange.xforce.ibmcloud.com/vulnerabilities/69803

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2011-3321), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.