CVE-2026-29516: Buffalo TeraStation NAS TS5400R firmware version 4.02-0.06 and prior contain an excessive file permissions vul

Q: How do I fix CVE-2026-29516?

terastation nas ts5400r firmware: upgrade to newer than 4.02-0.06. Exact commands for each OS are on this page.

Q: Is CVE-2026-29516 being exploited?

CVE-2026-29516 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-2026-29516 affect?

CVE-2026-29516 affects terastation nas ts5400r firmware. Severity is medium (CVSS 4.9). 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 webs

Q: How urgent is CVE-2026-29516?

Priority 28/100. No elevated risk signals yet.

Routine

MEDIUM 4.9UPGRADE

CVE-2026-29516 is a medium-severity flaw (CVSS 4.9) affecting terastation nas ts5400r firmware. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	4.9 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	High
User interaction	None
EPSS exploit chance	0.5% (top 55%)
CISA exploited list	No
Weakness	CWE-732
Published	2026-03-16
Last modified	2026-06-17

Publisher (CNA): VulnCheck · Vendor: buffaloamericas

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-03-16 20:16 UTCPublished CVE record published
2026-06-17 10:29 UTCUpdated Record last modified

buffaloamericas terastation nas ts5400r firmware UPGRADE

Affected: <= 4.02-0.06

Fixed in: newer than 4.02-0.06

Safe to downgrade to: no unaffected older release

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

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-2026-29516?

terastation nas ts5400r firmware: upgrade to newer than 4.02-0.06. Exact commands for each OS are on this page.

Is CVE-2026-29516 being exploited?

CVE-2026-29516 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-2026-29516 affect?

CVE-2026-29516 affects terastation nas ts5400r firmware. Severity is medium (CVSS 4.9). 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 webs

How urgent is CVE-2026-29516?

Priority 28/100. No elevated risk signals yet.

Software pages

PHP vulnerabilities

References

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