# CVE-2025-6752: Linksys WRT1900ACS/EA7200/EA7450/EA7500 IGD Layer3Forwarding SetDefaultConnectionService stack-based overflow

> Remote attackers can trigger a stack-based buffer overflow in Linksys routers via the IGD interface, potentially leading to code execution.

- **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:** 27 Jun 2025
- **Updated:** 27 Jun 2025
- **Also known as:** GHSA-7f6v-fmjx-rjvr

## What is CVE-2025-6752?

CVE-2025-6752 is a high-severity memory corruption vulnerability in Linksys EA7200, published on 27 Jun 2025. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

A vulnerability has been found in Linksys WRT1900ACS, EA7200, EA7450 and EA7500 up to 20250619 and classified as critical. This vulnerability affects the function SetDefaultConnectionService of the file /upnp/control/Layer3Forwarding of the component IGD. The manipulation of the argument NewDefaultConnectionService leads to stack-based buffer overflow. The attack can be initiated remotely. The exploit has been disclosed to the public and may be used. The vendor was contacted early about this disclosure but did not respond in any way.

Weakness: CWE-121 (Stack-based Buffer Overflow), CWE-119 (Improper Restriction of Operations within the Bounds of a Memory Buffer)

## Which versions are affected by CVE-2025-6752?


## How do I fix CVE-2025-6752?

No fix has been published for CVE-2025-6752 yet. Limit exposure of the affected software until one is available.

## Is CVE-2025-6752 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-6752 exists.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2025-6752 and fix it if it is affected.

What it is: CVE-2025-6752 is a high-severity memory corruption vulnerability in Linksys EA7200, published on 27 Jun 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-2025-6752 exists.

Affected product: Linksys EA7200. 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-2025-6752/ (Markdown: https://insights.sbomify.com/CVE-2025-6752/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2025-6752
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2025-6752
- OSV: https://osv.dev/vulnerability/CVE-2025-6752

---
From sbomify Insights: https://insights.sbomify.com/CVE-2025-6752/
Summaries are generated and may contain mistakes; the official description above is the record.