What is CVE-2024-23331?

CVE-2024-23331 is a high-severity vulnerability in Microsoft Windows, classified under Improper Handling of Case Sensitivity. CVSS score: 7.5/10. Published 2024-01-19.

How severe is CVE-2024-23331?

High severity. CVSS v3 base score is 7.5 out of 10.

Is CVE-2024-23331 known to be exploited?

3 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Information disclosure in Microsoft Windows

CVE-2024-23331

Vite is a frontend tooling framework for javascript. The Vite dev server option `server.fs.deny` can be bypassed on case-insensitive file systems using case-augmented versions of filenames. Notably this affects servers hosted on Windows. This bypass is similar to CVE-2023-34092 -- with surface area reduced to hosts having case-insensitive filesystems. Since `picomatch` defaults to case-sensitive glob matching, but the file server doesn't discriminate; a blacklist bypass is possible. By requesting raw filesystem paths using augmented casing, the matcher derived from `config.server.fs.deny` fails to block access to sensitive files. This issue has been addressed in vite@5.0.12, vite@4.5.2, vite@3.2.8, and vite@2.9.17. Users are advised to upgrade. Users unable to upgrade should restrict access to dev servers.

Published 2024-01-19 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N.

EPSS exploit prediction

EPSS: 0.008 (55.2th percentile), scored 2026-10-19.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 55th percentile — 55.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.008 · newest: 0.008 · change: 0.000

Affected products

Microsoft Windows
Vitejs Vite — versions >=2.7.0, < 2.9.17, >=3.0.0, <3.2.8, >=4.0.0, < 4.5.2

Weakness classification (CWE)

Public proof-of-concept exploits

References

github.com/vitejs/vite/security/advisories/GHSA-c24v-8rfc-w8vw (Exploit, Vendor Advisory)
github.com/vitejs/vite/commit/91641c4da0a011d4c5352e88fc68389d4e1289a5 (Patch)
vitejs.dev/config/server-options.html (Product)

Frequently asked questions

What is CVE-2024-23331?: CVE-2024-23331 is a high-severity vulnerability in Microsoft Windows, classified under Improper Handling of Case Sensitivity. CVSS score: 7.5/10. Published 2024-01-19.
How severe is CVE-2024-23331?: High severity. CVSS v3 base score is 7.5 out of 10.
Is CVE-2024-23331 known to be exploited?: 3 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.