# CVE-2024-1786: D-Link DIR-600M C1 Telnet Service buffer overflow

> Remote attackers can exploit a buffer overflow in the Telnet service of unsupported D-Link routers to execute arbitrary code.

- **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:** 23 Feb 2024
- **Updated:** 21 Aug 2024
- **Also known as:** GHSA-wrvf-j637-77w5

## What is CVE-2024-1786?

CVE-2024-1786 is a high-severity memory corruption vulnerability in D-Link DIR-600M C1, published on 23 Feb 2024. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

** UNSUPPORTED WHEN ASSIGNED ** A vulnerability, which was classified as critical, has been found in D-Link DIR-600M C1 3.08. Affected by this issue is some unknown functionality of the component Telnet Service. The manipulation of the argument username leads to buffer overflow. The attack may be launched remotely. The exploit has been disclosed to the public and may be used. The identifier of this vulnerability is VDB-254576. NOTE: This vulnerability only affects products that are no longer supported by the maintainer. NOTE: Vendor was contacted early and confirmed immediately that the product is end-of-life. It should be retired and replaced.

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

## Which versions are affected by CVE-2024-1786?

It affects 1 product.


Products: Dlink Dir-600m Firmware.

## How do I fix CVE-2024-1786?

No fix has been published for CVE-2024-1786 yet. Limit exposure of the affected software until one is available.

## Is CVE-2024-1786 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2024-1786 exists.

## Other vulnerabilities in D-Link DIR-600M C1

- [CVE-2019-13101](https://insights.sbomify.com/CVE-2019-13101/): Missing authorization in n/a (critical 9.8)
- [CVE-2019-7736](https://insights.sbomify.com/CVE-2019-7736/): Auth bypass in n/a (critical 9.8)
- [CVE-2017-9100](https://insights.sbomify.com/CVE-2017-9100/): Auth bypass in n/a (high 8.8)
- [CVE-2020-13960](https://insights.sbomify.com/CVE-2020-13960/): Misconfiguration in n/a (high 7.5)
- [CVE-2018-16605](https://insights.sbomify.com/CVE-2018-16605/): Cross-site scripting in n/a (medium 5.4)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2024-1786 and fix it if it is affected.

What it is: CVE-2024-1786 is a high-severity memory corruption vulnerability in D-Link DIR-600M C1, published on 23 Feb 2024. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2024-1786 exists.

Affected product: D-Link DIR-600M C1. 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-2024-1786/ (Markdown: https://insights.sbomify.com/CVE-2024-1786/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2024-1786
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2024-1786
- OSV: https://osv.dev/vulnerability/CVE-2024-1786

---
From sbomify Insights: https://insights.sbomify.com/CVE-2024-1786/
Summaries are generated and may contain mistakes; the official description above is the record.