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Fencer Intel
critical 9.3

CVE-2011-4508 json

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,…

published 2012-02-03 14 y ago modified 2026-06-16 4 mo ago also EUVD-2011-4434

cvss
9.3
version 2.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
3.0%
EPSS 3.0% chance of exploitation in 30 days, percentile 87%
public exploits
0
none known

Summary

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.

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

cisa ICSA-12-030-01A updated cvss 9.3

Siemens SIMATIC WinCC Vulnerabilities

  • Siemens Multiple SIMATIC HMI panels (TP, OP, MP, Comfort Panels, Mobile Panels) Siemens WinCC flexible 2004, 2005, 2007, 2008 Siemens WinCC flexible Runtime Siemens WinCC V11 (TIA portal) Siemens WinCC V11 Runtime Advanced
    affected: mitigation “WinCC V11 (TIA Portal) SP2 Update 1, (http://support.automation.siemens.com/WW/view/en/58112587)”

From CISA ICS and IT advisories (CSAF, https://github.com/cisagov/CSAF), a U.S. Government work; changed: reduced to products, statuses and remediations. CISA notification · csaf

cisa ICSA-11-356-01 updated cvss 9.3

Siemens Simatic HMI Authentication Vulnerabilities

  • Siemens Multiple SIMATIC Panels TP_OP_MP_Mobile_and_Comfort Siemens SIMATIC WinCC flexible RT 2004, 2005, 2005, SP1, 2007, 2008, 2008, SP1, 2008, SP2 Siemens SIMATIC WinCC Runtime Advanced 11, 11, SP1, 11, SP2
    affected: mitigation “Product documentation has been updated to tell the user how to set a proper password during initial setup to remove the risk of the default password vulnerability.”

From CISA ICS and IT advisories (CSAF, https://github.com/cisagov/CSAF), a U.S. Government work; changed: reduced to products, statuses and remediations. CISA notification · csaf

Exploit prediction

2.98% chance of exploitation in the next 30 days, higher than 87% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
NVD 2.0 9.3 AV:N/AC:M/Au:N/C:C/I:C/A:C

Classification

Weakness

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.