CVE-2004-2628: Multiple directory traversal vulnerabilities in thttpd 2.07 beta 0.4, when running on Windows, allow remote at

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MEDIUM 5.0DOWNGRADE

CVE-2004-2628 is a medium-severity flaw (CVSS 5.0) affecting thttpd. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Multiple directory traversal vulnerabilities in thttpd 2.07 beta 0.4, when running on Windows, allow remote attackers to read arbitrary files via a URL that contains (1) a hex-encoded backslash dot-dot sequence ("%5C..") or (2) a drive letter (such as "C:").

Why this priority

Public exploit reference

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	5.0 (Medium)
EPSS exploit chance	3.6% (top 10%)
CISA exploited list	No
Published	2004-12-31
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: acme labs

Last updated 2026-06-16 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2004-12-31 05:00 UTCPublished CVE record published
2026-06-16 22:10 UTCUpdated Record last modified

acme labs thttpd DOWNGRADE

Affected: 2.0.7_beta_0.4

Fixed in: no fixed release known

Safe to downgrade to: a release before 2.0.7_beta_0.4

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 2.0.7_beta_0.4 (Debian / Ubuntu)

apt-cache madison thttpd sudo apt install thttpd=<VERSION_BEFORE_2.0.7_beta_0.4> sudo apt-mark hold thttpd

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list thttpd sudo dnf downgrade thttpd-<VERSION_BEFORE_2.0.7_beta_0.4> sudo dnf versionlock add thttpd

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Public exploits and detection

Public code exists for this CVE. Treat unpatched systems as at risk, and only run PoCs in a lab.

Exploit-DB: Acme thttpd 2.0.7 - Directory Traversal

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-2004-2628?

thttpd: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2004-2628 being exploited?

CVE-2004-2628 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-2004-2628 affect?

CVE-2004-2628 affects thttpd. Severity is medium (CVSS 5.0). Multiple directory traversal vulnerabilities in thttpd 2.07 beta 0.4, when running on Windows, allow remote attackers to read arbitrary files via a URL that contains (1) a hex-encoded backslash dot-dot sequence ("%5C..") or (2) a drive lett

How urgent is CVE-2004-2628?

Priority 45/100. Public exploit reference

Software pages

Windows vulnerabilities

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References

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