# CVE-2025-12211: Tenda O3 setDmzInfo GetValue stack-based overflow

> Remote attackers can trigger a stack-based buffer overflow in the Tenda O3 router's DMZ configuration interface, potentially leading to code execution or service disruption.

- **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:** 27 Oct 2025
- **Updated:** 24 Feb 2026
- **Also known as:** GHSA-5rcg-7jx4-f3xr

## What is CVE-2025-12211?

CVE-2025-12211 is a high-severity memory corruption vulnerability in Tenda O3, published on 27 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 Tenda O3 1.0.0.10(2478). Affected by this issue is the function SetValue/GetValue of the file /goform/setDmzInfo. The manipulation of the argument dmzIP results in stack-based buffer overflow. It is possible to launch the attack remotely. The exploit has been released to the public and may be used for attacks.

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-2025-12211?

It affects 1 product.


Products: Tenda O3 Firmware1.0.0.10\(2478\).

## How do I fix CVE-2025-12211?

No fix has been published for CVE-2025-12211 yet. Limit exposure of the affected software until one is available.

## Is CVE-2025-12211 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-12211 exists.

## Other vulnerabilities in Tenda O3

- [CVE-2025-12209](https://insights.sbomify.com/CVE-2025-12209/): Tenda O3 setDhcpConfig GetValue stack-based overflow (high 8.7)
- [CVE-2025-12210](https://insights.sbomify.com/CVE-2025-12210/): Tenda O3 AdvSetLanip GetValue stack-based overflow (high 8.7)
- [CVE-2025-12212](https://insights.sbomify.com/CVE-2025-12212/): Tenda O3 setNetworkService GetValue stack-based overflow (high 8.7)
- [CVE-2025-12213](https://insights.sbomify.com/CVE-2025-12213/): Tenda O3 setVlanConfig GetValue stack-based overflow (high 8.7)
- [CVE-2025-12214](https://insights.sbomify.com/CVE-2025-12214/): Tenda O3 sysAutoReboot GetValue stack-based overflow (high 8.7)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2025-12211 and fix it if it is affected.

What it is: CVE-2025-12211 is a high-severity memory corruption vulnerability in Tenda O3, published on 27 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-2025-12211 exists.

Affected product: Tenda O3. 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-2025-12211/ (Markdown: https://insights.sbomify.com/CVE-2025-12211/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2025-12211
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2025-12211
- OSV: https://osv.dev/vulnerability/CVE-2025-12211

---
From sbomify Insights: https://insights.sbomify.com/CVE-2025-12211/
Summaries are generated and may contain mistakes; the official description above is the record.