CVE-2003-1558: Buffer overflow in httpd.c of fnord 1.6 allows remote attackers to create a denial of service (crash) and poss

Routine

MEDIUM 5.0DOWNGRADE

CVE-2003-1558 is a medium-severity flaw (CVSS 5.0) affecting fnord. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Buffer overflow in httpd.c of fnord 1.6 allows remote attackers to create a denial of service (crash) and possibly execute arbitrary code via a long CGI request passed to the do_cgi function.

Why this priority

No elevated risk signals yet

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

Risk facts

CVSS score	5.0 (Medium)
EPSS exploit chance	3.1% (top 12%)
CISA exploited list	No
Weakness	CWE-119
Published	2003-12-31
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: fefe

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

Am I affected?

Timeline

2003-12-31 05:00 UTCPublished CVE record published
2026-06-16 22:04 UTCUpdated Record last modified

fefe fnord DOWNGRADE

Affected: 1.6

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.6

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 1.6 (Debian / Ubuntu)

apt-cache madison fnord sudo apt install fnord=<VERSION_BEFORE_1.6> sudo apt-mark hold fnord

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

dnf --showduplicates list fnord sudo dnf downgrade fnord-<VERSION_BEFORE_1.6> sudo dnf versionlock add fnord

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-2003-1558?

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

Is CVE-2003-1558 being exploited?

CVE-2003-1558 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-2003-1558 affect?

CVE-2003-1558 affects fnord. Severity is medium (CVSS 5.0). Buffer overflow in httpd.c of fnord 1.6 allows remote attackers to create a denial of service (crash) and possibly execute arbitrary code via a long CGI request passed to the do_cgi function.

How urgent is CVE-2003-1558?

Priority 39/100. No elevated risk signals yet.

Software pages

Apache HTTP Server vulnerabilities

References

← Back to latest CVEs