CVE-2001-0835: Cross-site scripting vulnerability in Webalizer 2.01-06, and possibly other versions, allows remote attackers

Q: How do I fix CVE-2001-0835?

webalizer: upgrade to newer than 2.0.6. Exact commands for each OS are on this page.

Q: Is CVE-2001-0835 being exploited?

CVE-2001-0835 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-2001-0835 affect?

CVE-2001-0835 affects webalizer. Severity is high (CVSS 7.5). Cross-site scripting vulnerability in Webalizer 2.01-06, and possibly other versions, allows remote attackers to inject arbitrary HTML tags by specifying them in (1) search keywords embedded in HTTP referrer information, or (2) host names t

This month

HIGH 7.5UPGRADE

CVE-2001-0835 is a high-severity flaw (CVSS 7.5) affecting webalizer. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Cross-site scripting vulnerability in Webalizer 2.01-06, and possibly other versions, allows remote attackers to inject arbitrary HTML tags by specifying them in (1) search keywords embedded in HTTP referrer information, or (2) host names that are retrieved via a reverse DNS lookup.

Why this priority

High severity

A fixed release or distro patch exists.

Risk facts

CVSS score	7.5 (High)
EPSS exploit chance	3.4% (top 11%)
CISA exploited list	No
Published	2001-12-06
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: bradford barrett

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

Am I affected?

Timeline

2001-12-06 05:00 UTCPublished CVE record published
2026-06-16 21:55 UTCUpdated Record last modified

bradford barrett webalizer UPGRADE

Affected: <= 2.0.6

Fixed in: newer than 2.0.6

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to newer than 2.0.6 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade webalizer

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-2001-0835?

webalizer: upgrade to newer than 2.0.6. Exact commands for each OS are on this page.

Is CVE-2001-0835 being exploited?

CVE-2001-0835 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-2001-0835 affect?

CVE-2001-0835 affects webalizer. Severity is high (CVSS 7.5). Cross-site scripting vulnerability in Webalizer 2.01-06, and possibly other versions, allows remote attackers to inject arbitrary HTML tags by specifying them in (1) search keywords embedded in HTTP referrer information, or (2) host names t

How urgent is CVE-2001-0835?

Priority 48/100. High severity

Related CVEs

CVE-2002-0180 HIGH 7.5 DOWNGRADE Buffer overflow in Webalizer 2.01-06, when configured to use reverse DNS lookups, allows remote attackers to e

References

← Back to latest CVEs