Description
Stack-based buffer overflow vulnerability exists in BUFFALO Wi-Fi products. A non-authenticated crafted HTTP request may cause a denial-of-service (DoS) condition.
Published: 2026-09-28
Score: 8.7 High
EPSS: < 1% Very Low
KEV: No
Impact: Denial of Service via stack overflow
Action: Immediate Patch
AI Analysis

Impact

Stack-based buffer overflow vulnerability in Buffalo Wi-Fi products allows an unauthenticated attacker to craft a malicious HTTP request that overflows a stack buffer and disrupts device operation. This leads to a denial‑of‑service condition without compromising confidentiality or integrity of data. The weakness corresponds to CWE‑121.

Affected Systems

Buffalo Inc. devices WEX‑G300 and WSR‑300HP are impacted. Any installation of these Wi-Fi products that contains the vulnerable firmware is susceptible; the description does not provide granular version numbers or firmware releases.

Risk and Exploitability

The CVSS score of 8.7 indicates high severity. EPSS is not available, so the current probability of exploitation is unknown. The vulnerability is not listed in CISA KEV. The attack vector is remote and requires only network access to send a crafted HTTP request; no authentication is needed. Successful exploitation results in temporary or sustained service interruption for affected networks.

Generated by OpenCVE AI on September 28, 2026 at 09:36 UTC.

Remediation

No vendor fix or workaround currently provided.

OpenCVE Recommended Actions

  • Obtain and install the vendor‑issued firmware upgrade that eliminates the stack‑overflow flaw
  • Restrict management‑HTTP access to trusted network segments or IP ranges using firewall or ACL rules
  • Continuously monitor device logs and network traffic for abnormal HTTP requests or repeated service restarts that may indicate exploitation attempts

Generated by OpenCVE AI on September 28, 2026 at 09:36 UTC.

Tracking

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Advisories

No advisories yet.

History

Mon, 28 Sep 2026 16:45:00 +0000

Type Values Removed Values Added
First Time appeared Buffalo
Buffalo wex-g300
Buffalo wsr-300hp
Vendors & Products Buffalo
Buffalo wex-g300
Buffalo wsr-300hp

Mon, 28 Sep 2026 10:00:00 +0000

Type Values Removed Values Added
Title Stack‑Based Buffer Overflow in Buffalo Wi-Fi Products Causing DoS via Unauthorized HTTP Requests

Mon, 28 Sep 2026 08:45:00 +0000

Type Values Removed Values Added
Description Stack-based buffer overflow vulnerability exists in BUFFALO Wi-Fi products. A non-authenticated crafted HTTP request may cause a denial-of-service (DoS) condition.
Weaknesses CWE-121
References
Metrics cvssV3_1

{'score': 7.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'}

cvssV4_0

{'score': 8.7, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N'}

Subscriptions

Buffalo Wex-g300 Wsr-300hp
cve-icon MITRE

Status: PUBLISHED

Assigner: jpcert

Published:

Updated: 2026-09-28T08:14:36.848Z

Reserved: 2026-09-24T08:54:17.057Z

Link: CVE-2026-95104

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-09-28T09:17:08.697

Modified: 2026-09-28T09:17:08.697

Link: CVE-2026-95104

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-09-28T16:23:09Z

Weaknesses
  • CWE-121

    Stack-based Buffer Overflow