CVE-2011-4509

The 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 Panels SIMATIC HMI panels; WinCC V11 Runtime Advanced; and WinCC flexible Runtime has an improperly selected default password for the administrator account, which makes it easier for remote attackers to obtain access via a brute-force approach involving many HTTP requests.

Published: 2012-02-03 Last update: 2026-04-29 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2011-4509 is rated High Risk (67.9/100): CVSS Critical severity, with medium exploitation likelihood (EPSS 1.16%). High exploitation likelihood—assess exposure and prioritize remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2011-4509

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2025-12-25 0.63% 1.16% +0.53%
2 2025-03-30 0.76% 0.63% -0.13%
3 2025-03-29 — 0.76% —

Full EPSS history (11 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2011-4509

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
10.0 2.0 HIGH
AV:N/AC:L/Au:N/C:C/I:C/A:C Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:L)
Exploitation conditions are straightforward and predictable.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:C)
Complete confidentiality impact.
Integrity impact (I:C)
Complete integrity impact.
Availability impact (A:C)
Complete availability impact.
 10.0 10.0 [email protected]

Weakness enumeration for CVE-2011-4509

Affected software / configurations for CVE-2011-4509

Vendor Product Version Raw CPE
siemens wincc_flexible 2004 cpe:2.3:a:siemens:wincc_flexible:2004:*:*:*:*:*:*:*
siemens wincc_flexible 2005 cpe:2.3:a:siemens:wincc_flexible:2005:*:*:*:*:*:*:*
siemens wincc_flexible 2007 cpe:2.3:a:siemens:wincc_flexible:2007:*:*:*:*:*:*:*
siemens wincc_flexible 2008 cpe:2.3:a:siemens:wincc_flexible:2008:*:*:*:*:*:*:*
siemens wincc v11 cpe:2.3:a:siemens:wincc:v11:*:*:*:*:*:*:*
siemens simatic_hmi_panels comfort_panels cpe:2.3:a:siemens:simatic_hmi_panels:comfort_panels:*:*:*:*:*:*:*
siemens simatic_hmi_panels mobile_panels cpe:2.3:a:siemens:simatic_hmi_panels:mobile_panels:*:*:*:*:*:*:*
siemens simatic_hmi_panels mp cpe:2.3:a:siemens:simatic_hmi_panels:mp:*:*:*:*:*:*:*
siemens simatic_hmi_panels op cpe:2.3:a:siemens:simatic_hmi_panels:op:*:*:*:*:*:*:*
siemens simatic_hmi_panels tp cpe:2.3:a:siemens:simatic_hmi_panels:tp:*:*:*:*:*:*:*
siemens wincc_runtime_advanced v11 cpe:2.3:a:siemens:wincc_runtime_advanced:v11:*:*:*:*:*:*:*
siemens wincc_flexible_runtime — cpe:2.3:a:siemens:wincc_flexible_runtime:*:*:*:*:*:*:*:*

References for CVE-2011-4509

cvelogic Threat Intelligence