# CVE-2025-7945: D-Link DIR-513 formSetWanDhcpplus buffer overflow

> Remote attackers can trigger a buffer overflow in the D-Link DIR-513 router's DHCP configuration interface, potentially executing arbitrary code on this unsupported device.

- **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:X`)
- **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:** 21 Jul 2025
- **Updated:** 23 Jul 2025
- **Also known as:** GHSA-49rm-7f9x-mx4g

## What is CVE-2025-7945?

CVE-2025-7945 is a high-severity memory corruption vulnerability in D-Link DIR-513, published on 21 Jul 2025. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

A vulnerability was found in D-Link DIR-513 up to 20190831. It has been declared as critical. This vulnerability affects the function formSetWanDhcpplus of the file /goform/formSetWanDhcpplus. The manipulation of the argument curTime leads to buffer overflow. The attack can be initiated remotely. This vulnerability only affects products that are no longer supported by the maintainer.

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-2025-7945?


## How do I fix CVE-2025-7945?

No fix has been published for CVE-2025-7945 yet. Limit exposure of the affected software until one is available.

## Is CVE-2025-7945 being exploited?

There is no known exploitation of CVE-2025-7945 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2025-7945 and fix it if it is affected.

What it is: CVE-2025-7945 is a high-severity memory corruption vulnerability in D-Link DIR-513, published on 21 Jul 2025. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2025-7945 in the wild and no public exploit code.

Affected product: D-Link DIR-513. 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-2025-7945/ (Markdown: https://insights.sbomify.com/CVE-2025-7945/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2025-7945
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2025-7945
- OSV: https://osv.dev/vulnerability/CVE-2025-7945

---
From sbomify Insights: https://insights.sbomify.com/CVE-2025-7945/
Summaries are generated and may contain mistakes; the official description above is the record.