CVE-2000-0359: Buffer overflow in Trivial HTTP (THTTPd) allows remote attackers to cause a denial of service or execute arbit

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HIGH 10.0DOWNGRADE

CVE-2000-0359 is a high-severity flaw (CVSS 10.0) affecting thttpd. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Buffer overflow in Trivial HTTP (THTTPd) allows remote attackers to cause a denial of service or execute arbitrary commands via a long If-Modified-Since header.

Why this priority

Critical severity
EPSS top 7%: very likely to be exploited

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

Risk facts

CVSS score	10.0 (High)
EPSS exploit chance	5.5% (top 7%)
CISA exploited list	No
Published	2000-10-20
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

2000-10-20 04:00 UTCPublished CVE record published
2026-06-16 21:51 UTCUpdated Record last modified

acme labs thttpd DOWNGRADE

Affected: 1.90a · 1.95 · 2.0 · 2.0.1 · 2.0.2 · 2.0.3 · 2.0.4

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.90a

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 1.90a (Debian / Ubuntu)

apt-cache madison thttpd sudo apt install thttpd=<VERSION_BEFORE_1.90a> sudo apt-mark hold thttpd

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

dnf --showduplicates list thttpd sudo dnf downgrade thttpd-<VERSION_BEFORE_1.90a> 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-2000-0359?

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

Is CVE-2000-0359 being exploited?

CVE-2000-0359 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-2000-0359 affect?

CVE-2000-0359 affects thttpd. Severity is high (CVSS 10.0). Buffer overflow in Trivial HTTP (THTTPd) allows remote attackers to cause a denial of service or execute arbitrary commands via a long If-Modified-Since header.

How urgent is CVE-2000-0359?

Priority 58/100. Critical severity; EPSS top 7%: very likely to be exploited

Related CVEs

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CVE-2017-17663 CRITICAL 9.8 UPGRADE UPGRADE The htpasswd implementation of mini_httpd before v1.28 and of thttpd before v2.28 is affected by a buffer over
CVE-2013-0348 LOW 2.1 UPGRADE MITIGATE thttpd.c in sthttpd before 2.26.4-r2 and thttpd 2.25b use world-readable permissions for /var/log/thttpd.log,
CVE-2012-5640 MEDIUM 5.5 MITIGATE thttpd has a local DoS vulnerability via specially-crafted .htpasswd files
CVE-2009-4491 CRITICAL 9.8 DOWNGRADE thttpd 2.25b0 writes data to a log file without sanitizing non-printable characters, which might allow remote

References

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