CVE-2026-8776Public exploitNetwork attack vector

Authenticated code execution via oversized PPTP username

Published May 18, 2026 · Updated May 18, 2026

Buffer overflow in Edimax BR-6428nS 1.10 allows remote authenticated users to execute arbitrary code via a crafted PPTP username. The formPPTPSetup POST handler copies pptpUserName into a destination buffer without verifying that the supplied value fits. Access to the web management interface and low privileges are required; successful exploitation runs code in the router's web-service context.

CVSS severity8.8
High
EPSS probability0.45%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Buffer overflow in Edimax BR-6428nS 1.10 allows remote authenticated users to execute arbitrary code via a crafted PPTP username. The formPPTPSetup POST handler copies pptpUserName into a destination buffer without verifying that the supplied value fits. Access to the web management interface and low privileges are required; successful exploitation runs code in the router's web-service context.

The record

CVE
CVE-2026-8776
Published
May 18, 2026
Updated
May 18, 2026
Vendor
Edimax Technology Co., Ltd.
Product
BR-6428nS
Classifications
CWE-119, CWE-120, T1190
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. May 18, 2026CVE publishedPublication date reported by the CVE source.
  2. May 18, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=1.10

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Edimax Technology Co., Ltd. · BR-6428nSversion=1.10

Published CVSS scores

7.4VulDBCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P
9.0VulDBAV:N/AC:L/Au:S/C:C/I:C/A:C
8.8VulDBCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-119Improper Restriction of Operations within the Bounds of a Memory Buffer
CWE-120Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
T1190Exploit Public-Facing Application

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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