What is CVE-2021-40349?

CVE-2021-40349 is a medium-severity vulnerability in Speed Test Project, classified under Path Traversal. CVSS score: 5.3/10. Published 2021-09-27.

How severe is CVE-2021-40349?

Medium severity. CVSS v3 base score is 5.3 out of 10.

Path Traversal in Speed Test Project

CVE-2021-40349

e7d Speed Test (aka speedtest) 0.5.3 allows a path-traversal attack that results in information disclosure via the "GET /.." substring.

Vulnerability class: Path Traversal (Directory Traversal)

Published 2021-09-27 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N.

EPSS exploit prediction

EPSS: 0.011 (65.3th percentile), scored 2026-10-09.

Low probability of exploitation in the next 30 days, but still tracked. 65th percentile — 65.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.011 · newest: 0.011 · change: 0.000

Affected products

Speed Test Project — versions 0.5.3

Weakness classification (CWE)

CWE-22 — Path Traversal

References

github.com/e7d/speedtest/releases (Third Party Advisory, Release Notes)
old.reddit.com/r/HackingTechniques/comments/poc55t/directory_traversal_bypass_o… (Patch, Third Party Advisory)

Frequently asked questions

What is CVE-2021-40349?: CVE-2021-40349 is a medium-severity vulnerability in Speed Test Project, classified under Path Traversal. CVSS score: 5.3/10. Published 2021-09-27.
How severe is CVE-2021-40349?: Medium severity. CVSS v3 base score is 5.3 out of 10.