CVE-2016-20039

HIGHPre-NVD 8.48.4—
EchelonGraph scoreMEDIUM confidence

Score 8.4 from GitHub Security Advisory (severity: HIGH) published 2026-03-28. a secondary CVSS source baseline 8.4; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
8.4EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 8.4Exploit: None knownExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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.

CVSS v3
8.4
EG Score
8.4(medium)
EG Risk
42(Track)
EG Risk 42/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity84% × 45%
Exploitation0% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
4%
KEV
Not listed

Published

March 28, 2026

Last Modified

June 17, 2026

Advisory Details (3)

Auto-updated Aug 2, 2026
🔬 Proof of concept available. No patch confirmed yet.
generic

Multi Emulator Super System 0.154-3.1 Buffer Overflow | Advisories | VulnCheck

https://www.vulncheck.com/advisories/multi-emulator-super-system-buffer-overflow
generic🟡 PoC Available

Mess Emulator 0.154-3.1 - Local Buffer Overflow - Linux local Exploit

https://www.exploit-db.com/exploits/39673
generic

MAMEdev.org | Home of The MAME Project

http://mamedev.org/

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 3× in last 7d / 19× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-09-15 03:05 UTCEPSS rescore
  2. 2026-09-13 16:41 UTCEPSS rescore
  3. 2026-09-10 09:26 UTCEPSS rescore
  4. 2026-09-07 15:56 UTCEPSS rescore
  5. 2026-09-04 13:56 UTCEPSS rescore
  6. 2026-09-02 14:07 UTCEPSS rescore
  7. 2026-09-01 03:31 UTCEPSS rescore
  8. 2026-08-30 19:12 UTCEPSS rescore
  9. 2026-08-27 14:20 UTCEPSS rescore
  10. 2026-08-26 14:41 UTCEPSS rescore
  11. 2026-08-25 13:44 UTCEPSS rescore
  12. 2026-08-23 00:13 UTCEPSS rescore
  13. 2026-08-21 23:44 UTCEPSS rescore
  14. 2026-08-19 16:59 UTCEPSS rescore
  15. 2026-08-18 13:43 UTCEPSS rescore
  16. 2026-08-17 13:42 UTCEPSS rescore
  17. 2026-08-16 14:51 UTCEPSS rescore
  18. 2026-08-16 09:54 UTCEG score recompute
  19. 2026-08-16 09:54 UTCGHSA enrichment
  20. 2026-08-16 02:09 UTCEPSS rescore
  21. 2026-08-15 01:25 UTCEPSS rescore
  22. 2026-08-14 19:10 UTCGHSA enrichment
  23. 2026-08-14 06:14 UTCEG score recompute
  24. 2026-08-14 06:14 UTCGHSA enrichment
  25. 2026-08-12 20:33 UTCEG score recompute
Show 34 more
  1. 2026-08-12 20:33 UTCGHSA enrichment
  2. 2026-08-12 13:46 UTCEPSS rescore
  3. 2026-08-11 20:43 UTCEG score recompute
  4. 2026-08-11 20:42 UTCGHSA enrichment
  5. 2026-08-11 13:36 UTCEPSS rescore
  6. 2026-08-11 03:43 UTCEG score recompute
  7. 2026-08-11 03:43 UTCGHSA enrichment
  8. 2026-08-10 05:57 UTCGHSA enrichment
  9. 2026-08-09 17:52 UTCEG score recompute
  10. 2026-08-09 17:52 UTCGHSA enrichment
  11. 2026-08-09 13:42 UTCEPSS rescore
  12. 2026-08-09 05:47 UTCEG score recompute
  13. 2026-08-09 05:47 UTCGHSA enrichment
  14. 2026-08-08 16:32 UTCEPSS rescore
  15. 2026-08-08 04:18 UTCGHSA enrichment
  16. 2026-08-07 16:14 UTCGHSA enrichment
  17. 2026-08-06 18:33 UTCEG score recompute
  18. 2026-08-06 18:33 UTCGHSA enrichment
  19. 2026-08-06 13:42 UTCEPSS rescore
  20. 2026-08-06 00:43 UTCEG score recompute
  21. 2026-08-06 00:43 UTCGHSA enrichment
  22. 2026-08-05 19:12 UTCEPSS rescore
  23. 2026-08-04 15:04 UTCEPSS rescore
  24. 2026-08-03 23:04 UTCEG score recompute
  25. 2026-08-03 23:04 UTCGHSA enrichment
  26. 2026-08-02 15:08 UTCEG score recompute
  27. 2026-08-02 15:08 UTCGHSA enrichment
  28. 2026-08-02 02:22 UTCEPSS rescore
  29. 2026-08-01 04:11 UTCEPSS rescore
  30. 2026-07-30 16:23 UTCEPSS rescore
  31. 2026-07-30 01:26 UTCEPSS rescore
  32. 2026-07-28 15:31 UTCEPSS rescore
  33. 2026-07-27 14:19 UTCEG score recompute
  34. 2026-07-27 14:18 UTCGHSA enrichment

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2016-20039?
CVE-2016-20039 is a high vulnerability published on March 28, 2026. 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…
When was CVE-2016-20039 disclosed?
CVE-2016-20039 was first published in the National Vulnerability Database on March 28, 2026, with the most recent update on June 17, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2016-20039 actively exploited?
CVE-2016-20039 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 95.7% of all scored CVEs.
What is the CVSS score of CVE-2016-20039?
CVE-2016-20039 has a CVSS v3 base score of 8.4 (NVD).
How do I remediate CVE-2016-20039?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2016-20039, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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