# CVE-2025-29121: Memory corruption in n/a

> A stack-based buffer overflow in the Tenda AC6 router allows attackers to execute arbitrary code or cause a denial of service via the timeZone parameter.

- **Severity:** High 7.5 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 20 Mar 2025
- **Updated:** 21 Mar 2025
- **Also known as:** GHSA-v6jq-9h5f-2qcm

## What is CVE-2025-29121?

CVE-2025-29121 is a high-severity memory corruption vulnerability in Tenda Ac6 Firmware, published on 20 Mar 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

A vulnerability was found in Tenda AC6 V15.03.05.16. The vulnerability affects the functionality of the /goform/fast_setting_wifi_set file form_fast_setting_wifi_set. Using the timeZone parameter causes a stack-based buffer overflow.

Weakness: CWE-121 (Stack-based Buffer Overflow)

## Which versions are affected by CVE-2025-29121?

It affects 1 product.


Products: Tenda Ac6 Firmware.

## How do I fix CVE-2025-29121?

No fix has been published for CVE-2025-29121 yet. Limit exposure of the affected software until one is available.

## Is CVE-2025-29121 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-29121 exists.

## Other vulnerabilities in Tenda Ac6 Firmware

- [CVE-2025-27129](https://insights.sbomify.com/CVE-2025-27129/): Auth bypass in AC6 V5.0 (critical 9.8)
- [CVE-2025-29029](https://insights.sbomify.com/CVE-2025-29029/): Memory corruption in n/a (critical 9.8)
- [CVE-2025-29030](https://insights.sbomify.com/CVE-2025-29030/): Memory corruption in n/a (critical 9.8)
- [CVE-2025-29031](https://insights.sbomify.com/CVE-2025-29031/): Memory corruption in n/a (critical 9.8)
- [CVE-2025-25343](https://insights.sbomify.com/CVE-2025-25343/): Memory corruption in n/a (critical 9.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2025-29121 and fix it if it is affected.

What it is: CVE-2025-29121 is a high-severity memory corruption vulnerability in Tenda Ac6 Firmware, published on 20 Mar 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-29121 exists.

Affected product: Tenda Ac6 Firmware. 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-2025-29121/ (Markdown: https://insights.sbomify.com/CVE-2025-29121/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2025-29121
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2025-29121
- OSV: https://osv.dev/vulnerability/CVE-2025-29121

---
From sbomify Insights: https://insights.sbomify.com/CVE-2025-29121/
Summaries are generated and may contain mistakes; the official description above is the record.