Which versions of Buffalo Wi Fi Router Products are affected by CVE-2026-32678?

BUFFALO Wi-Fi routers are vulnerable to unauthenticated remote configuration manipulation, allowing attackers to alter critical device settings without credentials and potentially compromise network…

How to fix or mitigate CVE-2026-32678?

Within 24 hours: Inventory all BUFFALO Wi-Fi router deployments and identify internet-facing instances; document current firmware versions across all affected models. Within 7 days: Implement network segmentation to restrict management access to BUFFALO devices via firewall rules and disable remote management interfaces where operationally feasible; establish daily configuration monitoring to detect unauthorized changes. Within 30 days: Monitor BUFFALO security advisories for patch availability; evaluate replacement timelines for critical internet-facing units or transition to alternative vendor products with active security support.

Buffalo Wi Fi Router Products CVE-2026-32678

Q: What is the CVSS score of CVE-2026-32678?

CVE-2026-32678 has a CVSS 4.0 base score of 8.7 (High). CVSS vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/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-2026-16547 HIGH

Authentication Bypass Using an Alternate Path or Channel (CWE-288)

2026-03-27 jpcert

Authentication Bypass Buffalo Wi Fi Router Products

8.7

CVSS 4.0 · NVD

Severity by source

NVD PRIMARY

8.7 HIGH

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/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:N/UI:N/VC:N/VI:H/VA:N/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

None

User Interaction

None

Scope

Lifecycle Timeline

EUVD ID Assigned

Mar 27, 2026 - 06:00 euvd

EUVD-2026-16547

Analysis Generated

Mar 27, 2026 - 06:00 vuln.today

CVE Published

Mar 27, 2026 - 05:25 nvd

HIGH 8.7

DescriptionCVE.org

Authentication bypass issue exists in BUFFALO Wi-Fi router products, which may allow an attacker to alter critical configuration settings without authentication.

AnalysisAI

BUFFALO Wi-Fi router products allow unauthenticated remote attackers to bypass authentication mechanisms and modify critical configuration settings without valid credentials. This CWE-288 authentication bypass vulnerability affects BUFFALO Wi-Fi router product lines (CVSS 7.5, High severity) and enables complete compromise of device integrity. No public exploit identified at time of analysis, though the network-accessible attack surface and low complexity (AV:N/AC:L/PR:N) increase exposure risk for internet-facing devices.

Technical ContextAI

This vulnerability stems from CWE-288 (Authentication Bypass Using an Alternate Path or Channel), indicating BUFFALO Wi-Fi routers contain a code path that fails to properly validate user authentication before permitting access to administrative functions. The CPE identifier cpe:2.3:a:buffalo_inc.:buffalo_wi-fi_router_products:*:*:*:*:*:*:*:* suggests multiple product models within BUFFALO's consumer and enterprise router portfolio are affected. The flaw allows circumvention of normal authentication controls, likely through an alternate entry point or API endpoint that lacks proper authentication enforcement, enabling direct manipulation of device configuration parameters including network settings, access controls, and firmware management functions.

RemediationAI

Consult the official BUFFALO vendor security advisory at https://www.buffalo.jp/news/detail/20260323-01.html for specific patched firmware versions applicable to affected router models and upgrade immediately. The JVN advisory at https://jvn.jp/en/jp/JVN83788689/ provides additional remediation guidance and confirmation of fix availability. Until firmware updates can be applied, mitigate exposure by restricting management interface access to trusted internal networks only, disabling remote administration features, and implementing network-layer access controls (firewall rules) to block external access to administrative ports. Organizations should inventory BUFFALO router deployments, prioritize internet-facing devices for immediate patching, and monitor for unauthorized configuration changes through configuration backup comparison and logging review.