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

Q: How do I fix CVE-2020-15688?

goahead: upgrade to 5.1.2. Exact commands for each OS are on this page.

Q: Is CVE-2020-15688 being exploited?

CVE-2020-15688 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2020-15688 affect?

CVE-2020-15688 affects goahead. Severity is high (CVSS 8.8). 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 prote

Q: How urgent is CVE-2020-15688?

Priority 58/100. High severity; EPSS top 9%: very likely to be exploited; Public exploit reference

This month

HIGH 8.8UPGRADE

CVE-2020-15688 is a high-severity flaw (CVSS 8.8) affecting goahead. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

High severity
EPSS top 9%: very likely to be exploited
Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	8.8 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	4.0% (top 9%)
CISA exploited list	No
Weakness	CWE-294
Published	2020-07-23
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: embedthis

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2020-07-23 13:15 UTCPublished CVE record published
2026-06-17 02:57 UTCUpdated Record last modified

embedthis goahead UPGRADE

Affected: < 5.1.2

Fixed in: 5.1.2

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy goahead || rpm -q goahead || goahead --version

2. UPGRADE to 5.1.2 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade goahead

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade goahead

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2020-15688?

goahead: upgrade to 5.1.2. Exact commands for each OS are on this page.

Is CVE-2020-15688 being exploited?

CVE-2020-15688 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2020-15688 affect?

CVE-2020-15688 affects goahead. Severity is high (CVSS 8.8). 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 prote

How urgent is CVE-2020-15688?

Priority 58/100. High severity; EPSS top 9%: very likely to be exploited; Public exploit reference

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CVE-2021-42342 CRITICAL 9.8 UPGRADE An issue was discovered in GoAhead 4.x and 5.x before 5.1.5
CVE-2021-41615 CRITICAL 9.8 DOWNGRADE websda.c in GoAhead WebServer 2.1.8 has insufficient nonce entropy because the nonce calculation relies on the

References

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