# CVE-2022-40876: Memory corruption in n/a

> A stack overflow in Tenda AX1803 routers allows remote attackers to execute arbitrary code via crafted HTTP requests.

- **Severity:** Critical 9.8 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/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:** 27 Oct 2022
- **Updated:** 7 May 2025
- **Also known as:** GHSA-qwwj-2xhc-x8v6

## What is CVE-2022-40876?

CVE-2022-40876 is a critical memory corruption vulnerability in Tenda Ax1803 Firmware, published on 27 Oct 2022. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

In Tenda ax1803 v1.0.0.1, the http requests handled by the fromAdvSetMacMtuWan functions, wanSpeed, cloneType, mac, can cause a stack overflow and enable remote code execution (RCE).

Weakness: CWE-787 (Out-of-bounds Write)

## Which versions are affected by CVE-2022-40876?

It affects 1 product.


Products: Tenda Ax1803 Firmware.

## How do I fix CVE-2022-40876?

No fix has been published for CVE-2022-40876 yet. Limit exposure of the affected software until one is available.

## Is CVE-2022-40876 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2022-40876 exists.

## Other vulnerabilities in Tenda Ax1803 Firmware

- [CVE-2024-30620](https://insights.sbomify.com/CVE-2024-30620/): Memory corruption in n/a (critical 9.8)
- [CVE-2023-51952](https://insights.sbomify.com/CVE-2023-51952/): Memory corruption in n/a (critical 9.8)
- [CVE-2023-51953](https://insights.sbomify.com/CVE-2023-51953/): Memory corruption in n/a (critical 9.8)
- [CVE-2023-51954](https://insights.sbomify.com/CVE-2023-51954/): Memory corruption in n/a (critical 9.8)
- [CVE-2023-51956](https://insights.sbomify.com/CVE-2023-51956/): Memory corruption in n/a (critical 9.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2022-40876 and fix it if it is affected.

What it is: CVE-2022-40876 is a critical memory corruption vulnerability in Tenda Ax1803 Firmware, published on 27 Oct 2022. 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-2022-40876 exists.

Affected product: Tenda Ax1803 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-2022-40876/ (Markdown: https://insights.sbomify.com/CVE-2022-40876/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2022-40876
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2022-40876
- OSV: https://osv.dev/vulnerability/CVE-2022-40876

---
From sbomify Insights: https://insights.sbomify.com/CVE-2022-40876/
Summaries are generated and may contain mistakes; the official description above is the record.