# CVE-2022-40073: Memory corruption in n/a

> A buffer overflow in the Tenda AC21 router's httpd service allows attackers to execute arbitrary code via the saveParentControlInfo endpoint.

- **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:** 19 Sep 2022
- **Updated:** 3 Aug 2024
- **Also known as:** GHSA-vgjj-r3h2-cfqm

## What is CVE-2022-40073?

CVE-2022-40073 is a high-severity memory corruption vulnerability in n/a, published on 19 Sep 2022. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

Tenda AC21 V 16.03.08.15 is vulnerable to Buffer Overflow via /bin/httpd, saveParentControlInfo.

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

## Which versions are affected by CVE-2022-40073?

It affects 1 product.


Products: Tenda Ac21 Firmware.

## How do I fix CVE-2022-40073?

No fix has been published for CVE-2022-40073 yet. Limit exposure of the affected software until one is available.

## Is CVE-2022-40073 being exploited?

There is no known exploitation of CVE-2022-40073 in the wild and no public exploit code.

## Other vulnerabilities in n/a

- [CVE-2025-9605](https://insights.sbomify.com/CVE-2025-9605/): Tenda AC21/AC23 GetParentControlInfo stack-based overflow (critical 9.3)
- [CVE-2023-24333](https://insights.sbomify.com/CVE-2023-24333/): Command injection in n/a (high 8.8)
- [CVE-2026-4565](https://insights.sbomify.com/CVE-2026-4565/): Tenda AC21 SetNetControlList formSetQosBand buffer overflow (high 8.7)
- [CVE-2026-1637](https://insights.sbomify.com/CVE-2026-1637/): Tenda AC21 AdvSetMacMtuWan fromAdvSetMacMtuWan stack-based overflow (high 8.7)
- [CVE-2025-13445](https://insights.sbomify.com/CVE-2025-13445/): Tenda AC21 SetIpMacBind stack-based overflow (high 8.7)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2022-40073 and fix it if it is affected.

What it is: CVE-2022-40073 is a high-severity memory corruption vulnerability in n/a, published on 19 Sep 2022. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2022-40073 in the wild and no public exploit code.

Affected product: n/a. 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-2022-40073/ (Markdown: https://insights.sbomify.com/CVE-2022-40073/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2022-40073
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2022-40073
- OSV: https://osv.dev/vulnerability/CVE-2022-40073

---
From sbomify Insights: https://insights.sbomify.com/CVE-2022-40073/
Summaries are generated and may contain mistakes; the official description above is the record.