# CVE-2026-3166: Tenda F453 httpd RouteStatic fromRouteStatic buffer overflow

> Remote attackers can trigger a buffer overflow in the Tenda F453 router's httpd service via the RouteStatic endpoint, 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:** 25 Feb 2026
- **Updated:** 25 Feb 2026
- **Also known as:** GHSA-7gq2-xp8m-v3r5

## What is CVE-2026-3166?

CVE-2026-3166 is a high-severity memory corruption vulnerability in Tenda F453, published on 25 Feb 2026. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

A vulnerability was identified in Tenda F453 1.0.0.3. The affected element is the function fromRouteStatic of the file /goform/RouteStatic of the component httpd. Such manipulation of the argument page leads to buffer overflow. The attack can be launched remotely. The exploit is publicly available and might 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-2026-3166?

It affects 1 product.


Products: Tenda F453 Firmware.

## How do I fix CVE-2026-3166?

No fix has been published for CVE-2026-3166 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-3166 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-3166 exists.

## Other vulnerabilities in Tenda F453

- [CVE-2026-5021](https://insights.sbomify.com/CVE-2026-5021/): Tenda F453 httpd PPTPUserSetting fromPPTPUserSetting stack-based overflow (high 8.7)
- [CVE-2026-4551](https://insights.sbomify.com/CVE-2026-4551/): Tenda F453 Parameters SafeClientFilter fromSafeClientFilter memory corruption (high 8.7)
- [CVE-2026-4552](https://insights.sbomify.com/CVE-2026-4552/): Tenda F453 Parameters VirtualSer fromVirtualSer memory corruption (high 8.7)
- [CVE-2026-4553](https://insights.sbomify.com/CVE-2026-4553/): Tenda F453 Parameters Natlimit fromNatlimit stack-based overflow (high 8.7)
- [CVE-2026-3726](https://insights.sbomify.com/CVE-2026-3726/): Tenda F453 webExcptypemanFilter fromwebExcptypemanFilter stack-based overflow (high 8.7)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-3166 and fix it if it is affected.

What it is: CVE-2026-3166 is a high-severity memory corruption vulnerability in Tenda F453, published on 25 Feb 2026. 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-2026-3166 exists.

Affected product: Tenda F453. 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-2026-3166/ (Markdown: https://insights.sbomify.com/CVE-2026-3166/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-3166
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-3166
- OSV: https://osv.dev/vulnerability/CVE-2026-3166

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-3166/
Summaries are generated and may contain mistakes; the official description above is the record.