Is CVE-2013-3959 being actively exploited?

CVE-2013-3959 is not currently listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.

What is the CVSS score for CVE-2013-3959?

CVE-2013-3959 has a CVSS 2.0 base score of 4.0 (MEDIUM).

CVE-2013-3959

MEDIUM · CVSS 4.0EPSS 1.3%EU EUVD

The Web Navigator in Siemens WinCC before 7.2 Update 1, as used in SIMATIC PCS7 8.0 SP1 and earlier and other products, exhibits different behavior for NetBIOS user names depending on whether the user account exists, which allows remote authenticated users to enumerate account names via crafted URL parameters.

Key facts

CVSS score: 4.0 (v2.0)
Severity: MEDIUM
CVSS vector: AV:N/AC:L/Au:S/C:P/I:N/A:N
Weakness (CWE): CWE-200
EPSS score: 1.3% (71th percentile)
In CISA KEV: No
In EU EUVD: Yes (EUVD-2013-3891)
Published: June 14, 2013
NVD last modified: June 16, 2026
Status: Modified

EU Vulnerability Database (EUVD)

This vulnerability is also tracked by ENISA as EUVD-2013-3891 in the EU Vulnerability Database. Last updated in EUVD on September 16, 2024.

View on the EU Vulnerability Database

Affected products

siemens / simatic pcs7
siemens / simatic pcs7
siemens / wincc
siemens / wincc
siemens / wincc
siemens / wincc
siemens / wincc
siemens / wincc
siemens / wincc

References

http://www.siemens.com/corporate-technology/pool/de/forschungsfelder/siemens_security_advisory_ssa-345843.pdf(Vendor Advisory)

Last updated September 17, 2026 · Source: NVD, CISA KEV, FIRST.org EPSS

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