How severe is CVE-2013-3959?

CVE-2013-3959 has a CVSS 2.0 base score of 4.0, rated medium severity.

Is CVE-2013-3959 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (68th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2013-3959?

CVE-2013-3959 primarily affects Siemens Simatic Pcs7. In total, 9 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2013-3959?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2013-3959 published?

CVE-2013-3959 was published on 2013-06-14 and last updated on 2026-06-16.

CVE-2013-3959

CVE-2013-3959 is a medium-severity vulnerability in Siemens Simatic Pcs7 with a CVSS 2.0 base score of 4.0. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-200.

Key facts

Severity: Medium (CVSS 2.0 base score 4.0)
EPSS exploit prediction: 1% (68th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-200
Affected product: Siemens Simatic Pcs7
Published: 2013-06-14
Last modified: 2026-06-16

Description

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.

Frequently asked questions

What is CVE-2013-3959?: 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.
How severe is CVE-2013-3959?: CVE-2013-3959 has a CVSS 2.0 base score of 4.0, rated medium severity.
Is CVE-2013-3959 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (68th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2013-3959?: CVE-2013-3959 primarily affects Siemens Simatic Pcs7. In total, 9 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2013-3959?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2013-3959 published?: CVE-2013-3959 was published on 2013-06-14 and last updated on 2026-06-16.

References

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

Affected products (9)

cpe:2.3:a:siemens:simatic_pcs7:*:sp1:*:*:*:*:*:*
cpe:2.3:a:siemens:simatic_pcs7:8.0:*:*:*:*:*:*:*
cpe:2.3:a:siemens:wincc:*:*:*:*:*:*:*:*
cpe:2.3:a:siemens:wincc:7.0:*:*:*:*:*:*:*
cpe:2.3:a:siemens:wincc:7.0:sp1:*:*:*:*:*:*
cpe:2.3:a:siemens:wincc:7.0:sp2:*:*:*:*:*:*
cpe:2.3:a:siemens:wincc:7.0:sp3:*:*:*:*:*:*
cpe:2.3:a:siemens:wincc:7.1:*:*:*:*:*:*:*
cpe:2.3:a:siemens:wincc:7.1:sp1:*:*:*:*:*:*

More vulnerabilities in Siemens Simatic Pcs7

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