Unrated

Buffer Overflow in Edimax BR-6478AC V2 formWlSiteSurvey

IdentifiersCVE-2026-12806CWE-120

CVE-2026-12806 is a remotely exploitable buffer overflow vulnerability affecting Edimax BR-6478AC V2 firmware version 1.23. The flaw is in the formWlSiteSurvey function exposed through the /goform/formWlSiteSurvey POST request handler. According to the provided content, manipulation of the selSSID argument triggers the overflow. An unauthenticated or otherwise reachable remote attacker may be able to send a crafted POST request containing a maliciously formed selSSID value to corrupt memory in the affected process. Public exploit disclosure has been reported. The available information does not include the exact memory corruption mechanics, stack/heap location, or whether exploitation is limited to process crash versus reliable code execution.

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ANALYST BRIEF

Impact, mitigation & remediation

What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.

Impact

What an attacker gets, and what they’ve been doing with it.

Successful exploitation can cause memory corruption in the affected router service. At minimum, this may result in denial of service or device instability/crash. Depending on exploitability details that are not provided in the content, the overflow could potentially be leveraged for arbitrary code execution in the context of the vulnerable service, which on embedded network devices may enable full device compromise.

Mitigation

If you can’t patch tonight, do this now.

Until a patched firmware version is available, restrict access to the affected management interface and the /goform/formWlSiteSurvey endpoint to trusted administrative networks only. Disable or firewall remote administration where possible, avoid exposing the device management plane to the internet, segment affected routers from untrusted hosts, and monitor for suspicious crafted POST requests targeting /goform/formWlSiteSurvey, particularly those carrying anomalous selSSID values.

Remediation

Patch, then assume compromise.

Update the Edimax BR-6478AC V2 to a vendor-provided fixed firmware release when available. The provided content identifies version 1.23 as affected but does not specify a patched version. If no fix is available, organizations should plan to replace or retire affected devices, especially if they are exposed to untrusted networks.

PUBLIC EXPLOITS

Exploits

No public exploits tracked yet. Mallory keeps watching.

VALID 0 / 0 TOTALView more in app

No public exploit code observed for this vulnerability.

EXPOSURE SURFACE

Affected products & vendors

Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.

VendorProductType

EdimaxBr-6478Ac V2application

Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.

ACTIVITY FEED

Recent activity

7 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.

7 SOURCESView more in app

cvefeed high severityNews

Jun 21, 2026

CVE-2026-12806 - Edimax BR-6478AC V2 POST Request formWlSiteSurvey buffer overflow

A remote buffer overflow vulnerability in the Edimax BR-6478AC V2 POST Request Handler (/goform/formWlSiteSurvey), specifically in the formWlSiteSurvey function via the selSSID argument.

What this page doesn’t show

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Exposure mapping

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Threat actor evidence

Every observed campaign linking this CVE to a named adversary.

Associated malware

Malware families riding this exploit, with evidence and IOCs.

Detection signatures

YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.

Vendor-by-vendor mapping

Cross-references every affected SKU, including bundled OEM variants.

Social activity6

Community discussion across Reddit, Mastodon, and other social sources.

EXTERNAL REFERENCES

MITRE CVE

cve.org · CVE-2026-12806

NVD

nvd.nist.gov/vuln/detail/CVE-2026-12806

MITRE CWE · CWE-120

cwe.mitre.org