CVE-2005-3124: syslogtocern in Acme thttpd before 2.23 allows local users to write arbitrary files via a symlink attack on a

Routine

LOW 2.1WATCHLISTDOWNGRADE

CVE-2005-3124 is a low-severity flaw (CVSS 2.1) affecting thttpd. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

syslogtocern in Acme thttpd before 2.23 allows local users to write arbitrary files via a symlink attack on a temporary file.

Why this priority

On your watchlist

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

Risk facts

CVSS score	2.1 (Low)
EPSS exploit chance	0.4% (top 69%)
CISA exploited list	No
Published	2005-11-06
Last modified	2026-06-16

Publisher (CNA): Debian GNU/Linux · 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

2005-11-06 11:02 UTCPublished CVE record published
2026-06-16 22:16 UTCUpdated Record last modified

acme labs thttpd DOWNGRADE

Affected: 2.21b · 2.23b1

Fixed in: no fixed release known

Safe to downgrade to: a release before 2.21b

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 2.21b (Debian / Ubuntu)

apt-cache madison thttpd sudo apt install thttpd=<VERSION_BEFORE_2.21b> sudo apt-mark hold thttpd

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

dnf --showduplicates list thttpd sudo dnf downgrade thttpd-<VERSION_BEFORE_2.21b> 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.

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-2005-3124?

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

Is CVE-2005-3124 being exploited?

CVE-2005-3124 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-2005-3124 affect?

CVE-2005-3124 affects thttpd. Severity is low (CVSS 2.1). syslogtocern in Acme thttpd before 2.23 allows local users to write arbitrary files via a symlink attack on a temporary file.

How urgent is CVE-2005-3124?

Priority 20/100. On your watchlist

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References

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