{"cve":"CVE-2013-1337","nvd":{"published":"2013-05-15T03:36:34.420","modified":"2026-06-16T23:51:14.530","status":"Modified","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.\"","cvss_v4":null,"cvss_v3":null,"cwes":["CWE-287"],"references":["http://www.us-cert.gov/ncas/alerts/TA13-134A","https://docs.microsoft.com/en-us/security-updates/securitybulletins/2013/ms13-040","https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A16741","http://www.us-cert.gov/ncas/alerts/TA13-134A","https://docs.microsoft.com/en-us/security-updates/securitybulletins/2013/ms13-040"],"products":["microsoft:.net_framework"],"source":"nvd","synced_at":"2026-10-19T20:29:16.037019470+00:00"},"epss":{"cve":"CVE-2013-1337","score":0.20632,"percentile":0.97522,"date":"2026-10-31"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}