# CVE-2022-29640: Memory corruption in n/a

> Attackers can cause a Denial of Service on TOTOLINK routers via a stack overflow in the port forwarding configuration.

- **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:** 18 May 2022
- **Updated:** 3 Aug 2024
- **Also known as:** GHSA-6frp-g76w-6hqv

## What is CVE-2022-29640?

CVE-2022-29640 is a high-severity memory corruption vulnerability in n/a, published on 18 May 2022. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

TOTOLINK A3100R V4.1.2cu.5050_B20200504 and V4.1.2cu.5247_B20211129 were discovered to contain a stack overflow via the comment parameter in the function setPortForwardRules. This vulnerability allows attackers to cause a Denial of Service (DoS) via a crafted POST request.

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

## Which versions are affected by CVE-2022-29640?

It affects 1 product.


Products: Totolink A3100r Firmware.

## How do I fix CVE-2022-29640?

No fix has been published for CVE-2022-29640 yet. Limit exposure of the affected software until one is available.

## Is CVE-2022-29640 being exploited?

There is no known exploitation of CVE-2022-29640 in the wild and no public exploit code.

## Other vulnerabilities in n/a

- [CVE-2025-28256](https://insights.sbomify.com/CVE-2025-28256/): Command injection in n/a (critical 9.8)
- [CVE-2024-42546](https://insights.sbomify.com/CVE-2024-42546/): Memory corruption in n/a (critical 9.8)
- [CVE-2024-42547](https://insights.sbomify.com/CVE-2024-42547/): Memory corruption in n/a (critical 9.8)
- [CVE-2022-29644](https://insights.sbomify.com/CVE-2022-29644/): Hardcoded credentials in n/a (critical 9.8)
- [CVE-2022-29645](https://insights.sbomify.com/CVE-2022-29645/): Hardcoded credentials in n/a (critical 9.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2022-29640 and fix it if it is affected.

What it is: CVE-2022-29640 is a high-severity memory corruption vulnerability in n/a, published on 18 May 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-2022-29640 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-2022-29640/ (Markdown: https://insights.sbomify.com/CVE-2022-29640/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2022-29640
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2022-29640
- OSV: https://osv.dev/vulnerability/CVE-2022-29640

---
From sbomify Insights: https://insights.sbomify.com/CVE-2022-29640/
Summaries are generated and may contain mistakes; the official description above is the record.