Security readout for executives and security teams
Plain-English summary
A Buffalo TeraStation TS5400R NAS can expose password hashes if an already-authenticated attacker has enough access to abuse the webserver path described in the advisory. The issue does not directly reveal plaintext passwords, but hashes for all configured accounts, including root, could support later password cracking and broader compromise.
Executive priority
Treat this as a focused credential-exposure risk, not a broad unauthenticated takeover. Prioritize affected NAS devices that store sensitive business data or have management interfaces reachable outside a restricted admin network.
Technical view
CVE-2026-29516 is a CWE-732 excessive file permissions issue in Buffalo TeraStation NAS TS5400R firmware 4.02-0.06 and prior. Sources state /etc/shadow is world-readable, allowing authenticated attackers to retrieve account password hashes through uploaded and executed PHP in the webserver context. CVSS v4.0 score is 6.9.
Likely exposure
Exposure is limited to Buffalo TeraStation TS5400R systems on firmware 4.02-0.06 or earlier. Risk is highest where the management web interface is reachable by many users or exposed beyond trusted administration networks.
Exploitation context
The source bundle does not cite active exploitation, and the CVE is not marked KEV. Exploitation requires authentication with high privileges according to the CVSS vector, but successful access can disclose high-value credential hashes.
Researcher notes
Evidence supports affected product, version threshold, CWE-732 classification, and CVSS 6.9. The bundle does not include a named patch version, detailed vendor remediation, or public exploit confirmation. Avoid assuming broader Buffalo models are affected without separate evidence.
Mitigation direction
- Check Buffalo guidance for fixed firmware or vendor-approved mitigation.
- Restrict NAS web administration to trusted management networks only.
- Limit administrative accounts and remove unnecessary authenticated users.
- Rotate passwords if hash exposure is suspected or confirmed.
- Monitor NAS web activity for unusual authenticated file upload behavior.
Validation and detection
- Inventory Buffalo TeraStation TS5400R devices and record firmware versions.
- Flag systems running firmware 4.02-0.06 or earlier.
- Confirm management web access is not internet-exposed.
- Review NAS logs for suspicious authenticated webserver activity.
- Assess whether any account password hashes may require rotation.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-732: Authorization and privilege behavior lookup
Authorization weaknesses can support privilege escalation and valid-account review, depending on exploit path. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupCVE-2026-29516 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Medium
- CVSS
- 6.9 (4.0)
- Known Exploited
- No
- Published
Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
SSVC decision data
CVSS vector scores
2 official scoresWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N——VulnCheckCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N1.23.6VulnCheckVulnerability scoring details
Base CVSS 4.0 score
6.9MediumVector: CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
Base CVSS 3.1 score
4.9MediumVector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N
Vulnerability timeline
Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.
- CVE reservedCVE Program
The CVE ID was reserved by the assigning CNA.
- CVE publishedCVE Program
The CVE record was published.
- CVE updatedCVE Program
The CVE record metadata indicates this as the latest update time.
ADP provider summaries
Source materials
- CVE List V5 sourceCVE List V5
- https://buffaloamericas.com/CVE reference, VulnCheck · product
- https://www.vulncheck.com/advisories/buffalo-terastation-ts5400r-excessive-file-permissions-information-disclosureCVE reference, VulnCheck · third-party-advisory
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.