CVE-2020-15688

Name: CVE-2020-15688
Creator: NVD / NIST
Published: 2020-07-23T13:15:10.257+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 8.8/10EPSS 4.04%

Last modified Jun 17, 2026

CVE-2020-15688 is a high-severity vulnerability rated 8.8/10 on the CVSS scale. 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.. EPSS estimates a 4.04% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

8.8/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

EPSS Probability

4.04%

89.3th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-294

Affected Software

Vendor	Product	Versions
Embedthis	Goahead	< 5.1.2

References

http://packetstormsecurity.com/files/159505/EmbedThis-GoAhead-Web-Server-5.1.1-Digest-Authentication-Capture-Replay-Nonce-Reuse.htmlExploit, Third Party Advisory, VDB Entry
https://github.com/embedthis/goahead-gpl/issues/3Third Party Advisory
https://github.com/embedthis/goahead-gpl/issues/3Third Party Advisory
https://github.com/embedthis/goahead-gpl/issues/3Third Party Advisory
https://github.com/embedthis/goahead-gpl/issues/3Third Party Advisory
http://packetstormsecurity.com/files/159505/EmbedThis-GoAhead-Web-Server-5.1.1-Digest-Authentication-Capture-Replay-Nonce-Reuse.htmlExploit, Third Party Advisory, VDB Entry
https://github.com/embedthis/goahead-gpl/issues/3Third Party Advisory
https://github.com/embedthis/goahead-gpl/issues/3Third Party Advisory
https://github.com/embedthis/goahead-gpl/issues/3Third Party Advisory
https://github.com/embedthis/goahead-gpl/issues/3Third Party Advisory

Timeline

Published: Jul 23, 2020
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2020-15688?

How severe is CVE-2020-15688?

CVE-2020-15688 has a CVSS score of 8.8/10 (HIGH severity). The EPSS model estimates a 4.04% probability of exploitation in the next 30 days.

How do I fix CVE-2020-15688?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2020-15688?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST