CVE-2011-4877

Siemens WinCC flexible - Denial of Service via Crafted TCP Data

Title source: llm
STIX 2.1

Exploitation Summary

EIP tracks 1 public exploit for CVE-2011-4877. PoCs published by Luigi Auriemma.

AI-analyzed exploit summary This is a detailed technical analysis of multiple vulnerabilities in Siemens SIMATIC WinCC flexible (Runtime), including stack overflows, directory traversal, and arbitrary memory read access. The writeup provides in-depth root cause analysis, affected functions, and memory corruption mechanics.

Description

HmiLoad in the runtime loader in Siemens WinCC flexible 2004, 2005, 2007, and 2008; WinCC V11 (aka TIA portal); the TP, OP, MP, Comfort Panels, and Mobile Panels SIMATIC HMI panels; WinCC V11 Runtime Advanced; and WinCC flexible Runtime, when Transfer Mode is enabled, allows remote attackers to cause a denial of service (application crash) by sending crafted data over TCP.

Exploits (1)

exploitdb WRITEUP VERIFIED
by Luigi Auriemma · textdoswindows
https://www.exploit-db.com/exploits/18166

This is a detailed technical analysis of multiple vulnerabilities in Siemens SIMATIC WinCC flexible (Runtime), including stack overflows, directory traversal, and arbitrary memory read access. The writeup provides in-depth root cause analysis, affected functions, and memory corruption mechanics.

Classification
Writeup 100%
Attack Type
Other
Complexity
Moderate
Reliability
Theoretical
Target: Siemens SIMATIC WinCC flexible (Runtime) 2008 SP2 + security patch 1
No auth needed
Prerequisites: Network access to the target system · HmiLoad in Transfer mode listening on port 4410
devstral-2 · analyzed Feb 18, 2026 Full analysis →

References (8)

Core 8
Core References
Exploit, Third Party Advisory exploit x_refsource_exploit-db
http://www.exploit-db.com/exploits/18166
Various Sources x_refsource_misc
http://aluigi.org/adv/winccflex_1-adv.txt
Third Party Advisory, VDB Entry vdb-entry x_refsource_xf
https://exchange.xforce.ibmcloud.com/vulnerabilities/71451
Third Party Advisory, VDB Entry vdb-entry x_refsource_osvdb
http://www.osvdb.org/77382
US Government Resource x_refsource_misc
http://www.us-cert.gov/control_systems/pdf/ICSA-12-030-01.pdf

Scores

EPSS 0.0753
EPSS Percentile 93.7%

Details

CWE
CWE-20
Status published
Products (12)
siemens/simatic_hmi_panels comfort_panels
siemens/simatic_hmi_panels mobile_panels
siemens/simatic_hmi_panels mp
siemens/simatic_hmi_panels op
siemens/simatic_hmi_panels tp
siemens/wincc v11
siemens/wincc_flexible 2004
siemens/wincc_flexible 2005
siemens/wincc_flexible 2007
siemens/wincc_flexible 2008
... and 2 more
Published Feb 03, 2012
Tracked Since Feb 18, 2026