# CVE-2025-11300: Belkin F9K1015 formWlanMP buffer overflow

> Remote attackers can exploit a buffer overflow in the Belkin F9K1015 router's formWlanMP interface to execute arbitrary code or cause denial of service.

- **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:** 5 Oct 2025
- **Updated:** 24 Feb 2026
- **Also known as:** GHSA-fmr3-3xjp-2wx4

## What is CVE-2025-11300?

CVE-2025-11300 is a high-severity memory corruption vulnerability in Belkin F9K1015, published on 5 Oct 2025. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

A security flaw has been discovered in Belkin F9K1015 1.00.10. The impacted element is an unknown function of the file /goform/formWlanMP. The manipulation of the argument ateFunc results in buffer overflow. It is possible to launch the attack remotely. The exploit has been released to the public and may be used for attacks. The vendor was contacted early about this disclosure but did not respond in any way.

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-2025-11300?

It affects 1 product.


Products: Belkin F9k1015 Firmware.

## How do I fix CVE-2025-11300?

No fix has been published for CVE-2025-11300 yet. Limit exposure of the affected software until one is available.

## Is CVE-2025-11300 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-11300 exists.

## Other vulnerabilities in Belkin F9K1015

- [CVE-2026-5610](https://insights.sbomify.com/CVE-2026-5610/): Belkin F9K1015 formWISP5G stack-based overflow (high 8.7)
- [CVE-2026-5611](https://insights.sbomify.com/CVE-2026-5611/): Belkin F9K1015 formCrossBandSwitch stack-based overflow (high 8.7)
- [CVE-2026-5612](https://insights.sbomify.com/CVE-2026-5612/): Belkin F9K1015 formWlEncrypt stack-based overflow (high 8.7)
- [CVE-2026-5613](https://insights.sbomify.com/CVE-2026-5613/): Belkin F9K1015 formReboot stack-based overflow (high 8.7)
- [CVE-2026-5614](https://insights.sbomify.com/CVE-2026-5614/): Belkin F9K1015 formSetPassword stack-based overflow (high 8.7)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2025-11300 and fix it if it is affected.

What it is: CVE-2025-11300 is a high-severity memory corruption vulnerability in Belkin F9K1015, published on 5 Oct 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-2025-11300 exists.

Affected product: Belkin F9K1015. 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-2025-11300/ (Markdown: https://insights.sbomify.com/CVE-2025-11300/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2025-11300
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2025-11300
- OSV: https://osv.dev/vulnerability/CVE-2025-11300

---
From sbomify Insights: https://insights.sbomify.com/CVE-2025-11300/
Summaries are generated and may contain mistakes; the official description above is the record.