# CVE-2025-6402: TOTOLINK X15 HTTP POST Request formIpv6Setup buffer overflow

> Remote attackers can trigger a buffer overflow in the IPv6 setup handler of TOTOLINK X15 routers, potentially leading to arbitrary code execution.

- **Severity:** High 8.7 (`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`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 21 Jun 2025
- **Updated:** 23 Jun 2025
- **Also known as:** GHSA-pw29-w6hf-27h5

## What is CVE-2025-6402?

CVE-2025-6402 is a high-severity memory corruption vulnerability in TOTOLINK X15, published on 21 Jun 2025. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

A vulnerability was found in TOTOLINK X15 1.0.0-B20230714.1105. It has been declared as critical. This vulnerability affects unknown code of the file /boafrm/formIpv6Setup of the component HTTP POST Request Handler. The manipulation of the argument submit-url leads to buffer overflow. The attack can be initiated remotely. The exploit has been disclosed to the public and may be used.

Weakness: CWE-120 (Buffer Copy without Checking Size of Input), CWE-119 (Improper Restriction of Operations within the Bounds of a Memory Buffer)

## Which versions are affected by CVE-2025-6402?

It affects 1 product.


Products: Totolink X15 Firmware.

## How do I fix CVE-2025-6402?

No fix has been published for CVE-2025-6402 yet. Limit exposure of the affected software until one is available.

## Is CVE-2025-6402 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-6402 exists.

## Other vulnerabilities in TOTOLINK X15

- [CVE-2025-8242](https://insights.sbomify.com/CVE-2025-8242/): TOTOLINK X15 HTTP POST Request formFilter buffer overflow (high 8.7)
- [CVE-2025-8243](https://insights.sbomify.com/CVE-2025-8243/): TOTOLINK X15 HTTP POST Request formMapDel buffer overflow (high 8.7)
- [CVE-2025-8244](https://insights.sbomify.com/CVE-2025-8244/): TOTOLINK X15 HTTP POST Request formMapDelDevice buffer overflow (high 8.7)
- [CVE-2025-8245](https://insights.sbomify.com/CVE-2025-8245/): TOTOLINK X15 HTTP POST Request formMultiAPVLAN buffer overflow (high 8.7)
- [CVE-2025-8246](https://insights.sbomify.com/CVE-2025-8246/): TOTOLINK X15 HTTP POST Request formRoute buffer overflow (high 8.7)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2025-6402 and fix it if it is affected.

What it is: CVE-2025-6402 is a high-severity memory corruption vulnerability in TOTOLINK X15, published on 21 Jun 2025. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-6402 exists.

Affected product: TOTOLINK X15. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2025-6402/ (Markdown: https://insights.sbomify.com/CVE-2025-6402/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2025-6402
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2025-6402
- OSV: https://osv.dev/vulnerability/CVE-2025-6402

---
From sbomify Insights: https://insights.sbomify.com/CVE-2025-6402/
Summaries are generated and may contain mistakes; the official description above is the record.