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Vulnerability record · CVE-2011-4508 · published 3 February 2012

CVE-2011-4508: Siemens wincc flexible improper authentication vulnerability

Siemens · Wincc Flexible

The HMI web server in Siemens WinCC flexible 2004, 2005, 2007, and 2008 before SP3; WinCC V11 (aka TIA portal) before SP2 Update 1; the TP, OP, MP, Comfort Panels, and Mobile Panels SIMATIC HMI panels; WinCC V11 Runtime Advanced; and WinCC flexible Runtime generates predictable authentication tokens for cookies, which makes it easier for remote attackers to bypass authentication via a crafted cookie.

9.3 CVSS 2.0 High EPSS 3.0% · top 13.2% CWE-287 · Improper authentication
9.3CVSS 2.0 base score
3.0%EPSS exploitation probability, 30 days
NoNot in CISA KEV
5Affected product versions listed by NVD
4References
16 Jun 2026Last modified by NVD

Description

The HMI web server in Siemens WinCC flexible 2004, 2005, 2007, and 2008 before SP3; WinCC V11 (aka TIA portal) before SP2 Update 1; the TP, OP, MP, Comfort Panels, and Mobile Panels SIMATIC HMI panels; WinCC V11 Runtime Advanced; and WinCC flexible Runtime generates predictable authentication tokens for cookies, which makes it easier for remote attackers to bypass authentication via a crafted cookie.

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

Affected products

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

References

LinkTags
http://www.siemens.com/corporate-technology/pool/de/forschungsfelder/siemens_security_advisory_ssa-345442.pdf Vendor Advisory
http://www.us-cert.gov/control_systems/pdf/ICSA-12-030-01.pdf US Government Resource
http://www.siemens.com/corporate-technology/pool/de/forschungsfelder/siemens_security_advisory_ssa-345442.pdf Vendor Advisory
http://www.us-cert.gov/control_systems/pdf/ICSA-12-030-01.pdf US Government Resource

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Related vulnerabilities

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

10.0CVE-2011-4509Siemens wincc flexible permissions and access controls vulnerabilityThe HMI web server in Siemens WinCC flexible 2004, 2005, 2007, and 2008; WinCC V11 (aka TIA portal); the TP, OP, MP, Comfort Panels, and Mobile Panel…EPSS 2.0%10.0CVE-2011-4513Siemens wincc flexible vulnerabilitySiemens WinCC flexible 2004, 2005, 2007, and 2008; WinCC V11 (aka TIA portal); the TP, OP, MP, Comfort Panels, and Mobile Panels SIMATIC HMI panels; …EPSS 4.8%10.0CVE-2011-4514Siemens wincc flexible improper authentication vulnerabilityThe TELNET daemon in Siemens WinCC flexible 2004, 2005, 2007, and 2008; WinCC V11 (aka TIA portal); the TP, OP, MP, Comfort Panels, and Mobile Panels…EPSS 3.4%9.3CVE-2011-4875Siemens wincc flexible memory buffer overflow vulnerabilityStack-based buffer overflow in HmiLoad in the runtime loader in Siemens WinCC flexible 2004, 2005, 2007, and 2008; WinCC V11 (aka TIA portal); the TP…EPSS 14%9.3CVE-2011-4876Siemens wincc flexible path traversal vulnerabilityDirectory traversal vulnerability in HmiLoad in the runtime loader in Siemens WinCC flexible 2004, 2005, 2007, and 2008; WinCC V11 (aka TIA portal); …EPSS 9.0%8.5CVE-2011-4879Siemens wincc flexible improper input validation vulnerabilityminiweb.exe in the HMI web server in Siemens WinCC flexible 2004, 2005, 2007, and 2008 before SP3; WinCC V11 (aka TIA portal) before SP2 Update 1; th…EPSS 12%8.2CVE-2017-12069Siemens simatic pcs7 xml external entity (xxe) vulnerabilityAn XXE vulnerability has been identified in OPC Foundation UA .NET Sample Code before 2017-03-21 and Local Discovery Server (LDS) before 1.03.367. Am…EPSS 2.9%7.8CVE-2023-30897Siemens wincc incorrect permission assignment vulnerabilityA vulnerability has been identified in SIMATIC WinCC (All versions < V7.5.2.13). Affected applications fail to set proper access rights for their ins…EPSS 0.21%

Source: NIST National Vulnerability Database (record CVE-2011-4508), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.