CVE-2024-23771: darkhttpd before 1.15 uses strcmp (which is not constant time) to verify authentication, which makes it easier

Q: How do I fix CVE-2024-23771?

darkhttpd: upgrade to 1.15. Exact commands for each OS are on this page.

Q: Is CVE-2024-23771 being exploited?

CVE-2024-23771 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-2024-23771 affect?

CVE-2024-23771 affects darkhttpd. Severity is critical (CVSS 9.8). darkhttpd before 1.15 uses strcmp (which is not constant time) to verify authentication, which makes it easier for remote attackers to bypass authentication via a timing side channel.

Q: How urgent is CVE-2024-23771?

Priority 55/100. Critical severity; Remotely exploitable, no login, no user action

This month

CRITICAL 9.8REMOTEUPGRADE

CVE-2024-23771 is a critical-severity flaw (CVSS 9.8) affecting darkhttpd. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

darkhttpd before 1.15 uses strcmp (which is not constant time) to verify authentication, which makes it easier for remote attackers to bypass authentication via a timing side channel.

Why this priority

Critical severity
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	1.1% (top 36%)
CISA exploited list	No
Weakness	CWE-203
Published	2024-01-22
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: unix4lyfe

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

Am I affected?

Timeline

2024-01-22 04:15 UTCPublished CVE record published
2026-06-17 07:13 UTCUpdated Record last modified

unix4lyfe darkhttpd UPGRADE

Affected: < 1.15

Fixed in: 1.15

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to 1.15 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade darkhttpd

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-2024-23771?

darkhttpd: upgrade to 1.15. Exact commands for each OS are on this page.

Is CVE-2024-23771 being exploited?

CVE-2024-23771 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-2024-23771 affect?

CVE-2024-23771 affects darkhttpd. Severity is critical (CVSS 9.8). darkhttpd before 1.15 uses strcmp (which is not constant time) to verify authentication, which makes it easier for remote attackers to bypass authentication via a timing side channel.

How urgent is CVE-2024-23771?

Priority 55/100. Critical severity; Remotely exploitable, no login, no user action

Related CVEs

CVE-2024-23770 MEDIUM 5.5 UPGRADE darkhttpd through 1.15 allows local users to discover credentials (for --auth) by listing processes and their

References

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