CVE-2026-12806Public exploitNetwork attack vector

Authenticated code execution via selSSID buffer overflow

Published Jun 21, 2026 · Updated Jun 21, 2026

Buffer overflow in the BR-6478AC V2 1.23 POST handler allows remote authenticated users to execute code via a crafted selSSID value. The formWlSiteSurvey handler copies the attacker-controlled value into an output buffer without verifying that it fits. Low-privileged access to the web interface is required, and successful exploitation can compromise or crash the router.

CVSS severity8.8
High
EPSS probability0.80%
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 the BR-6478AC V2 1.23 POST handler allows remote authenticated users to execute code via a crafted selSSID value. The formWlSiteSurvey handler copies the attacker-controlled value into an output buffer without verifying that it fits. Low-privileged access to the web interface is required, and successful exploitation can compromise or crash the router.

The record

CVE
CVE-2026-12806
Published
Jun 21, 2026
Updated
Jun 21, 2026
Vendor
Edimax Technology Co., Ltd.
Product
BR-6478AC V2
Classifications
CWE-120, CWE-119, T1190
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 21, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 21, 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=1.23

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Edimax Technology Co., Ltd. · BR-6478AC V2version=1.23

Published CVSS scores

8.8VulDBCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
9.0VulDBAV:N/AC:L/Au:S/C:C/I:C/A:C
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

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