Which versions of Buffalo Wi Fi Router Products are affected by CVE-2026-33280?

BUFFALO Wi-Fi routers contain a hidden debugging interface that allows authenticated administrators to execute arbitrary commands remotely, creating a risk of insider abuse or lateral movement by…

How to fix or mitigate CVE-2026-33280?

Within 24 hours: Identify all BUFFALO Wi-Fi router models in production and document their current firmware versions and administrative user accounts. Within 7 days: Restrict administrative console access to a segregated management network and enforce multi-factor authentication on all router admin accounts; review audit logs for unauthorized administrative sessions. Within 30 days: Monitor BUFFALO's official security advisories for patch availability; prepare a firmware update plan and test in a non-production environment before deployment.

Buffalo Wi Fi Router Products CVE-2026-33280

Q: What is the CVSS score of CVE-2026-33280?

CVE-2026-33280 has a CVSS 4.0 base score of 8.6 (High). CVSS vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X. EPSS exploitation probability: 0.1%.

EUVD-2026-16549 HIGH

Hidden Functionality (CWE-912)

2026-03-27 jpcert

Information Disclosure Buffalo Wi Fi Router Products

8.6

CVSS 4.0 · NVD

Severity by source

NVD PRIMARY

8.6 HIGH

CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Attack Vector

Network

Attack Complexity

Low

Privileges Required

High

User Interaction

None

Scope

Lifecycle Timeline

EUVD ID Assigned

Mar 27, 2026 - 06:00 euvd

EUVD-2026-16549

Analysis Generated

Mar 27, 2026 - 06:00 vuln.today

CVE Published

Mar 27, 2026 - 05:25 nvd

HIGH 8.6

DescriptionCVE.org

Hidden functionality issue exists in BUFFALO Wi-Fi router products, which may allow an attacker to gain access to the product’s debugging functionality, resulting in the execution of arbitrary OS commands.

AnalysisAI

BUFFALO Wi-Fi router products contain hidden debugging functionality that permits authenticated attackers with high-level privileges to execute arbitrary operating system commands remotely. The vulnerability affects an unspecified range of BUFFALO's router lineup and carries a CVSS score of 7.2, requiring high privileges (PR:H) but low attack complexity over the network. No public exploit identified at time of analysis, and EPSS data is not provided in available intelligence.

Technical ContextAI

This vulnerability is classified as CWE-912 (Hidden Functionality), indicating the presence of undocumented or unintended debugging interfaces within BUFFALO Wi-Fi router firmware. The affected products are identified via CPE cpe:2.3:a:buffalo_inc.:buffalo_wi-fi_router_products:*:*:*:*:*:*:*:*, though specific model numbers and firmware versions are not detailed in the CPE string. Hidden functionality vulnerabilities typically arise from developer backdoors, diagnostic interfaces, or maintenance functions left accessible in production firmware. In this case, the debugging interface permits OS command execution, suggesting the presence of a shell or command interpreter accessible through the router's management interface or an undocumented network service. The root cause stems from insufficient access controls or improper removal of development-stage functionality before production deployment.

RemediationAI

Consult the BUFFALO vendor security advisory at https://www.buffalo.jp/news/detail/20260323-01.html for model-specific firmware updates and patching instructions. Patch availability per vendor advisory is indicated through the published notification, though exact firmware version numbers are not provided in analyzed intelligence sources. Until firmware updates can be applied, implement compensating controls including changing default administrative credentials to complex unique passwords, restricting management interface access to trusted IP ranges through firewall rules or access control lists, disabling remote administration features if not operationally required, and monitoring router logs for unauthorized access attempts or suspicious command execution patterns. Consider placing affected routers behind additional network security layers or replacing with alternative products if vendor support or patching is unavailable for specific models.