CVE-2011-4508

What it is

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.

At a glance

Exploitability

Can be exploited over the network without logging in. High risk of data exposure, data tampering, service disruption.

Exploit odds

3.0% chance of exploitation in the next 30 days (EPSS).

Fix

A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

1. 2012-02-03 20:55 UTC PublishedDisclosed publicly on CVE.org and NVD
2. 2026-06-16 23:34 UTC Last updatedMost recent change to the record

Why it ranks here

• Exploited in the wild: no, CISA does not list it.
• Exploit odds: 3.0% in the next 30 days (EPSS).
• Severity: 9.3 HIGH (CVSS).
• Fix: a patch or advisory is linked.

Details

Published

2012-02-03 20:55 UTC

Last modified

2026-06-16 23:34 UTC

Exploit probability

3.0% · EPSS, next 30 days

Weakness

CWE-287 · Improper authentication

Record status

Modified

Affected

• Siemens Wincc Flexible 2004
• Siemens Wincc Flexible 2005
• Siemens Wincc Flexible 2007
• Siemens Wincc Flexible 2008
• Siemens Wincc ≤ v11
• Siemens Wincc v11
• Siemens Simatic Hmi Panels comfort_panels
• Siemens Simatic Hmi Panels mobile_panels

Attack profile CVSS 2.0 · 9.3

Attack vector

Network

Complexity

Medium

Authentication

None

Confidentiality

Complete

Integrity

Complete

Availability

Complete

Is it in your code?

Hand this to your coding agent. It searches your project for the affected products and checks versions. Nothing leaves your machine.

Read https://cve-list.com/agent/cve/CVE-2011-4508.md and follow it. Check whether this project is affected by CVE-2011-4508. Read only. Don't change anything and don't upload my code. Tell me yes, no or not sure, with the file as proof.

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