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.
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: 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: —CVSS: 8.4Exploit: None knownExposed: 0
No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.
- 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 computedSeverity84% × 45%Exploitation0% × 40%Automatability30% × 15%Action: Routine — remediate on your standard cadence. - EPSS PROB
- —
- EPSS %ILE
- —
- KEV
- Not listed
Published
March 28, 2026
Last Modified
June 17, 2026
References (3)
- disclosure@vulncheckhttp://mamedev.org/
- disclosure@vulncheckhttps://www.exploit-db.com/exploits/39673
- disclosure@vulncheckhttps://www.vulncheck.com/advisories/multi-emulator-super-system-buffer-overflow
Weakness Classification(1)
MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.
Data Freshness Timeline
(refreshed 2× in last 7d / 2× 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.
- 2026-07-27 14:19 UTCEG score recompute
- 2026-07-27 14:18 UTCGHSA enrichment
Related CVEs(same CWE)
Same CWE
10 shownCWE-787
Frequently asked(4)
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.
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.
Dependency Blast Radius
Explore the affected products and dependency analysis for CVE-2016-20039
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