How severe is CVE-2013-1337?

CVE-2013-1337 has a CVSS 2.0 base score of 7.5, rated high severity.

Is CVE-2013-1337 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 21% (97th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2013-1337?

CVE-2013-1337 affects Microsoft .net Framework. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2013-1337?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2013-1337 published?

CVE-2013-1337 was published on 2013-05-15 and last updated on 2026-06-16.

CVE-2013-1337

CVE-2013-1337 is a high-severity vulnerability in Microsoft .net Framework with a CVSS 2.0 base score of 7.5. Its EPSS exploit-prediction score of 21% places it in the 97th percentile, indicating an elevated likelihood of exploitation. The underlying weakness is classified as CWE-287.

Key facts

Severity: High (CVSS 2.0 base score 7.5)
EPSS exploit prediction: 21% (97th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-287
Affected product: Microsoft .net Framework
Published: 2013-05-15
Last modified: 2026-06-16

Description

Microsoft .NET Framework 4.5 does not properly create policy requirements for custom Windows Communication Foundation (WCF) endpoint authentication in certain situations involving passwords over HTTPS, which allows remote attackers to bypass authentication by sending queries to an endpoint, aka "Authentication Bypass Vulnerability."

Frequently asked questions

What is CVE-2013-1337?: Microsoft .NET Framework 4.5 does not properly create policy requirements for custom Windows Communication Foundation (WCF) endpoint authentication in certain situations involving passwords over HTTPS, which allows remote attackers to bypass authentication by sending queries to an endpoint, aka "Authentication Bypass Vulnerability."
How severe is CVE-2013-1337?: CVE-2013-1337 has a CVSS 2.0 base score of 7.5, rated high severity.
Is CVE-2013-1337 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 21% (97th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2013-1337?: CVE-2013-1337 affects Microsoft .net Framework. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2013-1337?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2013-1337 published?: CVE-2013-1337 was published on 2013-05-15 and last updated on 2026-06-16.

References

Affected products (1)

cpe:2.3:a:microsoft:.net_framework:4.5:*:*:*:*:*:*:*

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Other CWE-287 (Improper Authentication) vulnerabilities

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