# CVE-2018-3951: Memory corruption in TP-Link

> An attacker with authentication can trigger a buffer overflow in the HTTP server to execute arbitrary code on TP-Link TL-R600VPN devices.

- **Severity:** High 7.2 (`CVSS:3.0/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** An administrator
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 1 Dec 2018
- **Updated:** 17 Sep 2024
- **Also known as:** GHSA-9r6w-5369-47xv

## What is CVE-2018-3951?

CVE-2018-3951 is a high-severity memory corruption vulnerability in Talos TP-Link, published on 1 Dec 2018. An attacker needs administrator access to exploit it, with no action from the victim.

### Official description

An exploitable remote code execution vulnerability exists in the HTTP header-parsing function of the TP-Link TL-R600VPN HTTP Server. A specially crafted HTTP request can cause a buffer overflow, resulting in remote code execution on the device. An attacker can send an authenticated HTTP request to trigger this vulnerability.

Weakness: CWE-119 (Improper Restriction of Operations within the Bounds of a Memory Buffer)

## Which versions are affected by CVE-2018-3951?

It affects 1 product.


Products: Tp-Link Tl-R600vpn Firmware.

## How do I fix CVE-2018-3951?

No fix has been published for CVE-2018-3951 yet. Limit exposure of the affected software until one is available.

## Is CVE-2018-3951 being exploited?

There is no known exploitation of CVE-2018-3951 in the wild and no public exploit code.

## Other vulnerabilities in Talos TP-Link

- [CVE-2018-3949](https://insights.sbomify.com/CVE-2018-3949/): Path traversal in TP-Link (high 7.5)
- [CVE-2018-3948](https://insights.sbomify.com/CVE-2018-3948/): Denial of service in TP-Link (high 7.5)
- [CVE-2018-3950](https://insights.sbomify.com/CVE-2018-3950/): Memory corruption in TP-Link (high 7.2)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2018-3951 and fix it if it is affected.

What it is: CVE-2018-3951 is a high-severity memory corruption vulnerability in Talos TP-Link, published on 1 Dec 2018. An attacker needs administrator access to exploit it, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2018-3951 in the wild and no public exploit code.

Affected product: Talos TP-Link. 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-2018-3951/ (Markdown: https://insights.sbomify.com/CVE-2018-3951/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2018-3951
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2018-3951
- OSV: https://osv.dev/vulnerability/CVE-2018-3951

---
From sbomify Insights: https://insights.sbomify.com/CVE-2018-3951/
Summaries are generated and may contain mistakes; the official description above is the record.