What’s Vulnerable › Vulnerabilities

CVE-2020-15688

• Severity: high (CVSS 8.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 4.0% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2020-07-23 · updated 2026-06-17
• Weakness: CWE-294

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.

Affected products

• EmbedThis GoAhead: before 5.1.2 — fixed in 5.1.2

How to fix

Upgrade to a fixed version: EmbedThis GoAhead 5.1.2. Check the vendor advisory for mitigations.

References

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

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