Is CVE-2013-1337 in the CISA KEV catalog?

No. CVE-2013-1337 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2013-1337?

CVE-2013-1337 has a CVSS v2 base score of 7.5 (HIGH).

What is the EPSS score for CVE-2013-1337?

CVE-2013-1337 has an EPSS score of 20.63% (97th percentile), estimating the probability of exploitation in the next 30 days.

CVE & CISA-KEV Catalog

CVE-2013-1337

HIGHEPSS 97th pctl

7.5

CVSS v2

NVD

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."

CWE-287Improper Authentication

CVSS v2 Vector

No CVSS vector data available.

Exploit Intelligence

20.63%probability of exploitation in 30 days

97thpercentile

Very high risk: more likely to be exploited than 97% of all known CVEs.

References

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-04-29.