What is CVE-2001-0766?

CVE-2001-0766 is a critical-severity vulnerability in Apache HTTP Server, classified under Improper Handling of Case Sensitivity. CVSS score: 9.8/10. Published 2001-10-18.

How severe is CVE-2001-0766?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Vulnerability in Apache HTTP Server

CVE-2001-0766

Apache on MacOS X Client 10.0.3 with the HFS+ file system allows remote attackers to bypass access restrictions via a URL that contains some characters whose case is not matched by Apache's filters.

Published 2001-10-18 · last modified 2026-06-16.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.082 (94.7th percentile), scored 2026-09-29.

Low probability of exploitation in the next 30 days, but still tracked. 95th percentile — 94.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.082 · newest: 0.082 · change: 0.000

Affected products

Apache HTTP Server — versions 1.3.14
Apple Mac OS X — versions 10.0.3

Weakness classification (CWE)

CWE-178 — Improper Handling of Case Sensitivity

References

archives.neohapsis.com/archives/bugtraq/2001-06/0090.html (Broken Link, Vendor Advisory, mailing-list, Patch)
www.securityfocus.com/bid/2852 (Exploit, Patch, VDB Entry, Third Party Advisory, vdb-entry, Broken Link, Vendor Advisory)

Frequently asked questions

What is CVE-2001-0766?: CVE-2001-0766 is a critical-severity vulnerability in Apache HTTP Server, classified under Improper Handling of Case Sensitivity. CVSS score: 9.8/10. Published 2001-10-18.
How severe is CVE-2001-0766?: Critical severity. CVSS v3 base score is 9.8 out of 10.