CVE-2013-3959

NONECVSS 0.0
0.0
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • No confirmed exploitation signals yet
CISA-KEV: Not listedEPSS: 1%CVSS: —Exploit: NoneExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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.

CVSS v3
—
EG Score
0.0(none)
EPSS
67.7%
KEV
Not listed

Published

June 14, 2013

Last Modified

April 29, 2026

References (2)

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 7× in last 7d / 35× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-07-06 02:19 UTCEPSS rescore
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  28. 2026-05-28 23:39 UTCEG score recompute
  29. 2026-05-28 23:39 UTCGHSA enrichment
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  49. 2026-05-18 21:29 UTCEPSS rescore
  50. 2026-05-18 21:29 UTCEPSS rescore

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Frequently asked(4)

What is CVE-2013-3959?
CVE-2013-3959 is a none vulnerability published on June 14, 2013. 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…
When was CVE-2013-3959 disclosed?
CVE-2013-3959 was first published in the National Vulnerability Database on June 14, 2013, with the most recent update on April 29, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2013-3959 actively exploited?
CVE-2013-3959 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 67.7% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
How do I remediate CVE-2013-3959?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2013-3959, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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