What is CVE-2026-29516?

CVE-2026-29516 is a medium-severity vulnerability in Buffalo Terastation Nas Ts5400r, classified under Incorrect Permission Assignment for Critical Resource. CVSS score: 4.9/10. Published 2026-03-16.

How severe is CVE-2026-29516?

Medium severity. CVSS v3 base score is 4.9 out of 10.

Vulnerability in Buffalo Terastation Nas Ts5400r

CVE-2026-29516

Buffalo TeraStation NAS TS5400R firmware version 4.02-0.06 and prior contain an excessive file permissions vulnerability that allows authenticated attackers to read the /etc/shadow file by uploading and executing a PHP file through the webserver. Attackers can exploit world-readable permissions on /etc/shadow to retrieve hashed passwords for all configured accounts including root.

Published 2026-03-16 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 4.9 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N.

EPSS exploit prediction

EPSS: 0.006 (47.5th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 48th percentile — 47.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.005 · newest: 0.006 · change: +0.001

Affected products

Weakness classification (CWE)

CWE-732 — Incorrect Permission Assignment for Critical Resource

References

buffaloamericas.com/ (Product, product)
www.vulncheck.com/advisories/buffalo-terastation-ts5400r-excessive-file-permiss… (Third Party Advisory, third-party-advisory)

Frequently asked questions

What is CVE-2026-29516?: CVE-2026-29516 is a medium-severity vulnerability in Buffalo Terastation Nas Ts5400r, classified under Incorrect Permission Assignment for Critical Resource. CVSS score: 4.9/10. Published 2026-03-16.
How severe is CVE-2026-29516?: Medium severity. CVSS v3 base score is 4.9 out of 10.