# CVE-2023-36355: Memory corruption in n/a

> A buffer overflow in TP-Link TL-WR940N V4 routers allows attackers to cause a Denial of Service via a crafted GET request.

- **Severity:** Critical 9.9 (`CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H`)
- **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:** 22 Jun 2023
- **Updated:** 2 Dec 2024
- **Also known as:** GHSA-p3q7-28hc-q76h

## What is CVE-2023-36355?

CVE-2023-36355 is a critical memory corruption vulnerability in n/a, published on 22 Jun 2023. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

TP-Link TL-WR940N V4 was discovered to contain a buffer overflow via the ipStart parameter at /userRpm/WanDynamicIpV6CfgRpm. This vulnerability allows attackers to cause a Denial of Service (DoS) via a crafted GET request.

Weakness: CWE-120 (Buffer Copy without Checking Size of Input)

## Which versions are affected by CVE-2023-36355?

It affects 1 product.


Products: Tp-Link Tl-Wr940n Firmware.

## How do I fix CVE-2023-36355?

No fix has been published for CVE-2023-36355 yet. Limit exposure of the affected software until one is available.

## Is CVE-2023-36355 being exploited?

There is no known exploitation of CVE-2023-36355 in the wild and no public exploit code.

Public exploit code:

- TP-Link TL-WR940N V4 - Buffer OverFlow (exploitdb)

## Other vulnerabilities in n/a

- [CVE-2022-24355](https://insights.sbomify.com/CVE-2022-24355/): Memory corruption in TL-WR940N (high 8.8)
- [CVE-2019-6989](https://insights.sbomify.com/CVE-2019-6989/): Memory corruption in n/a (high 8.8)
- [CVE-2026-11409](https://insights.sbomify.com/CVE-2026-11409/): OS Command Injection in IPv6 PPPoE Configuration in TP-Link TL-WR940N (high 8.5)
- [CVE-2026-11410](https://insights.sbomify.com/CVE-2026-11410/): OS Command Injection in BigPond Cable (BPA) Configuration in TP-Link TL-WR940N (high 8.5)
- [CVE-2025-6151](https://insights.sbomify.com/CVE-2025-6151/): TP-Link TL-WR940N, TL-WR841N WanSlaacCfgRpm.htm buffer overflow (high 8.2)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2023-36355 and fix it if it is affected.

What it is: CVE-2023-36355 is a critical memory corruption vulnerability in n/a, published on 22 Jun 2023. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2023-36355 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-2023-36355/ (Markdown: https://insights.sbomify.com/CVE-2023-36355/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2023-36355
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2023-36355
- OSV: https://osv.dev/vulnerability/CVE-2023-36355

---
From sbomify Insights: https://insights.sbomify.com/CVE-2023-36355/
Summaries are generated and may contain mistakes; the official description above is the record.