# CVE-2025-13550: D-Link DIR-822K/DWR-M920 formVpnConfigSetup buffer overflow

> Remote attackers can trigger a buffer overflow in D-Link routers via the formVpnConfigSetup interface, potentially leading to code execution or service disruption.

- **Severity:** High 8.7 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P`)
- **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:** 23 Nov 2025
- **Updated:** 24 Nov 2025
- **Also known as:** GHSA-fr44-hj8r-v92r

## What is CVE-2025-13550?

CVE-2025-13550 is a high-severity memory corruption vulnerability in D-Link DIR-822K, published on 23 Nov 2025. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

A vulnerability was determined in D-Link DIR-822K and DWR-M920 1.00_20250513164613/1.1.50. Impacted is an unknown function of the file /boafrm/formVpnConfigSetup. Executing manipulation of the argument submit-url can lead to buffer overflow. The attack can be executed remotely. The exploit has been publicly disclosed and may be utilized.

Weakness: CWE-120 (Buffer Copy without Checking Size of Input), CWE-119 (Improper Restriction of Operations within the Bounds of a Memory Buffer)

## Which versions are affected by CVE-2025-13550?

It affects 2 products.


Products: Dlink Dir-822k Firmware, Dlink Dwr-M920 Firmware.

## How do I fix CVE-2025-13550?

No fix has been published for CVE-2025-13550 yet. Limit exposure of the affected software until one is available.

## Is CVE-2025-13550 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-13550 exists.

## Other vulnerabilities in D-Link DIR-822K

- [CVE-2025-13547](https://insights.sbomify.com/CVE-2025-13547/): D-Link DIR-822K/DWR-M920 formDdns memory corruption (high 8.7)
- [CVE-2025-13548](https://insights.sbomify.com/CVE-2025-13548/): D-Link DIR-822K/DWR-M920 formFirewallAdv buffer overflow (high 8.7)
- [CVE-2025-13549](https://insights.sbomify.com/CVE-2025-13549/): D-Link DIR-822K formNtp sub_455524 buffer overflow (high 8.7)
- [CVE-2025-13551](https://insights.sbomify.com/CVE-2025-13551/): D-Link DIR-822K/DWR-M920 formWanConfigSetup buffer overflow (high 8.7)
- [CVE-2025-13552](https://insights.sbomify.com/CVE-2025-13552/): D-Link DIR-822K/DWR-M920 formWlEncrypt buffer overflow (high 8.7)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2025-13550 and fix it if it is affected.

What it is: CVE-2025-13550 is a high-severity memory corruption vulnerability in D-Link DIR-822K, published on 23 Nov 2025. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-13550 exists.

Affected product: D-Link DIR-822K. 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-2025-13550/ (Markdown: https://insights.sbomify.com/CVE-2025-13550/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2025-13550
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2025-13550
- OSV: https://osv.dev/vulnerability/CVE-2025-13550

---
From sbomify Insights: https://insights.sbomify.com/CVE-2025-13550/
Summaries are generated and may contain mistakes; the official description above is the record.