EUVD-2026-33482
GHSA-pxj4-7p26-956c
Severity by source
CVSS: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/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:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P/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
Lifecycle Timeline
5DescriptionCVE.org
A vulnerability has been found in Edimax BR-6478AC 1.23. This issue affects the function formUSBAccount of the file /goform/formUSBAccount of the component POST Request Handler. The manipulation of the argument UserName/Password leads to buffer overflow. Remote exploitation of the attack is possible. The exploit has been disclosed to the public and may be used.
AnalysisAI
Buffer overflow in the Edimax BR-6478AC v1.23 wireless router allows authenticated remote attackers to corrupt memory by sending oversized UserName or Password values to the /goform/formUSBAccount endpoint. Publicly available exploit code exists for this issue, raising the practical risk despite the requirement for low-level credentials, though no active exploitation has been confirmed via CISA KEV.
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires network reachability to the router's HTTP administration interface on the /goform/formUSBAccount endpoint AND valid low-privilege credentials to the web admin (PR:L in the CVSS 4.0 vector), with no user interaction required (UI:N). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 4.0 score of 7.4 reflects network attack vector (AV:N), low complexity (AC:L), and low privileges required (PR:L), with high impact to confidentiality, integrity, and availability of the vulnerable component (VC:H/VI:H/VA:H) but no scope change. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker who has obtained low-privilege admin credentials (default 'admin/1234', guessed, or harvested from a credential dump) sends a crafted POST request to /goform/formUSBAccount with oversized UserName or Password fields, overflowing a stack buffer in the formUSBAccount handler. On these embedded MIPS/ARM devices with limited mitigations, the overflow can be leveraged to crash the router (denial of service) or to achieve code execution as the web daemon (typically root), enabling persistent implantation, DNS hijacking, or recruitment into a botnet - a published PoC at the referenced Notion page lowers the barrier to weaponization. |
| Remediation | No vendor-released patch identified at time of analysis - the Edimax BR-6478AC reached end-of-sale years ago and the VulDB entry (https://vuldb.com/vuln/367416) and exploit writeup do not cite a fixed firmware release. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours: Inventory all Edimax BR-6478AC v1.23 routers and restrict network access to administrative interfaces via firewall rules and network segmentation. …
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External POC / Exploit Code
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