# CVE-2025-7551: Tenda FH1201 PPTPDClient fromPptpUserAdd stack-based overflow

> Remote attackers can trigger a stack-based buffer overflow in the PPTPDClient component of Tenda FH1201 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:** 13 Jul 2025
- **Updated:** 14 Jul 2025
- **Also known as:** GHSA-mw22-79xw-3xrh

## What is CVE-2025-7551?

CVE-2025-7551 is a high-severity memory corruption vulnerability in Tenda FH1201, published on 13 Jul 2025. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

A vulnerability was found in Tenda FH1201 1.2.0.14(408). It has been declared as critical. Affected by this vulnerability is the function fromPptpUserAdd of the file /goform/PPTPDClient. The manipulation of the argument modino/username leads to stack-based buffer overflow. The attack can be launched remotely. The exploit has been disclosed to the public and may be used.

Weakness: CWE-121 (Stack-based Buffer Overflow), CWE-119 (Improper Restriction of Operations within the Bounds of a Memory Buffer)

## Which versions are affected by CVE-2025-7551?

It affects 1 product.


Products: Tenda Fh1201 Firmware.

## How do I fix CVE-2025-7551?

No fix has been published for CVE-2025-7551 yet. Limit exposure of the affected software until one is available.

## Is CVE-2025-7551 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-7551 exists.

## Other vulnerabilities in Tenda FH1201

- [CVE-2024-42947](https://insights.sbomify.com/CVE-2024-42947/): Command injection in n/a (critical 9.8)
- [CVE-2026-5045](https://insights.sbomify.com/CVE-2026-5045/): Tenda FH1201 Parameter WrlclientSet stack-based overflow (high 8.7)
- [CVE-2026-5046](https://insights.sbomify.com/CVE-2026-5046/): Tenda FH1201 Parameter WrlExtraSet formWrlExtraSet stack-based overflow (high 8.7)
- [CVE-2025-14994](https://insights.sbomify.com/CVE-2025-14994/): Tenda FH1201/FH1206 HTTP Request webtypelibrary strcat stack-based overflow (high 8.7)
- [CVE-2025-14995](https://insights.sbomify.com/CVE-2025-14995/): Tenda FH1201 SetIpBind sprintf stack-based overflow (high 8.7)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2025-7551 and fix it if it is affected.

What it is: CVE-2025-7551 is a high-severity memory corruption vulnerability in Tenda FH1201, published on 13 Jul 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-2025-7551 exists.

Affected product: Tenda FH1201. 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-2025-7551/ (Markdown: https://insights.sbomify.com/CVE-2025-7551/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2025-7551
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2025-7551
- OSV: https://osv.dev/vulnerability/CVE-2025-7551

---
From sbomify Insights: https://insights.sbomify.com/CVE-2025-7551/
Summaries are generated and may contain mistakes; the official description above is the record.