# CVE-2023-36356: Denial of service in n/a

> Attackers can cause a denial of service on TP-Link routers via a crafted GET request exploiting a buffer read out-of-bounds vulnerability.

- **Severity:** High 7.7 (`CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:N/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-56f7-mw56-5449

## What is CVE-2023-36356?

CVE-2023-36356 is a high-severity denial of service 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 V2/V4/V6, TL-WR841N V8, TL-WR941ND V5, and TL-WR740N V1/V2 were discovered to contain a buffer read out-of-bounds via the component /userRpm/VirtualServerRpm. This vulnerability allows attackers to cause a Denial of Service (DoS) via a crafted GET request.

Weakness: CWE-125 (Out-of-bounds Read)

## Which versions are affected by CVE-2023-36356?

It affects 4 products.


Products: Tp-Link Tl-Wr740n Firmware, Tp-Link Tl-Wr841n Firmware, Tp-Link Tl-Wr940n Firmware, Tp-Link Tl-Wr941nd Firmware.

## How do I fix CVE-2023-36356?

No fix has been published for CVE-2023-36356 yet. Limit exposure of the affected software until one is available.

## Is CVE-2023-36356 being exploited?

There is no known exploitation of CVE-2023-36356 in the wild and no public exploit code.

## Other vulnerabilities in n/a

- [CVE-2023-33538](https://insights.sbomify.com/CVE-2023-33538/): TP-Link Multiple Routers Command Injection (high 8.8, exploited in the wild)
- [CVE-2023-33536](https://insights.sbomify.com/CVE-2023-33536/): Memory corruption in n/a (high 8.1)
- [CVE-2023-33537](https://insights.sbomify.com/CVE-2023-33537/): Memory corruption in n/a (high 8.1)
- [CVE-2023-36354](https://insights.sbomify.com/CVE-2023-36354/): Memory corruption in n/a (high 7.5)
- [CVE-2022-4296](https://insights.sbomify.com/CVE-2022-4296/): TP-Link TL-WR740N ARP resource consumption (medium 6.5)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2023-36356 and fix it if it is affected.

What it is: CVE-2023-36356 is a high-severity denial of service 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-2023-36356 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-2023-36356/ (Markdown: https://insights.sbomify.com/CVE-2023-36356/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2023-36356
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2023-36356
- OSV: https://osv.dev/vulnerability/CVE-2023-36356

---
From sbomify Insights: https://insights.sbomify.com/CVE-2023-36356/
Summaries are generated and may contain mistakes; the official description above is the record.