miniweb.exe in the HMI web server in Siemens WinCC flexible 2004, 2005, 2007, and 2008 before SP3; WinCC V11 (aka TIA portal) before SP2 Up…

published 2012-02-03 14 y ago modified 2026-06-16 4 mo ago also EUVD-2011-4796

cvss: 8.5; version 2.0, NVD
cisa kev: Not listed; not in CISA's catalog
epss: 12.1%; EPSS 12.1% chance of exploitation in 30 days, percentile 96%
public exploits: 1; Exploit-DB

miniweb.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; the TP, OP, MP, Comfort Panels, and Mobile Panels SIMATIC HMI panels; WinCC V11 Runtime Advanced; and WinCC flexible Runtime does not properly handle URIs beginning with a 0xfa character, which allows remote attackers to read data from arbitrary memory locations or cause a denial of service (application crash) via a crafted POST request.

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 2025-06-09 cvss 8.5

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

Timeline

2011-11-28 First public exploit (EDB-18166)
2012-02-03 Published

Exploit prediction

12.11% chance of exploitation in the next 30 days, higher than 96% of all scored CVEs (FIRST EPSS, 2026-11-09).

Exploits and checks

EDB-18166 Siemens SIMATIC WinCC Flexible (Runtime) - Multiple Vulnerabilities dos, 2011-11-28

CVSS scores

assigned by	version	score	vector
NVD	2.0	8.5	AV:N/AC:L/Au:N/C:P/I:N/A:C

Classification

Weakness

CWE-20 Improper Input Validation

References

exploit-db.com /exploits/18166
exploit
siemens.com /corporate-technology/pool/de/forschungsfelder/siemens_security_advisory_ssa-345442.pdf
vendor-advisory
us-cert.gov /control_systems/pdf/ICS-ALERT-11-332-02.pdf
us-cert.gov /control_systems/pdf/ICS-ALERT-11-332-02A.pdf
aluigi.org /adv/winccflex_1-adv.txt
osvdb.org /77384
vdb-entry
exchange.xforce.ibmcloud.com /vulnerabilities/71453
vdb-entry
us-cert.gov /control_systems/pdf/ICSA-12-030-01.pdf
us-government-resource

Sources

CVE List CVE-2011-4879
NVD CVE-2011-4879

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.

Summary