CVE-2020-25462

CRITICALNVD 9.89.8

9.8

Heap buffer overflow in the fxCheckArrowFunction function at moddable/xs/sources/xsSyntaxical.c:3562 in Moddable SDK before OS200903.

CVSS v3: 9.8
EG Score: 9.8(low)
EPSS: 64.5%
KEV: Not listed

Published

December 4, 2020

Last Modified

November 21, 2024

Advisory Details (2)

Auto-updated May 30, 2026

Patch available. Sources: github_release.

github_release Patch Available

September 3, 2020

Patch available: Moddable-OpenSource/moddable OS200903

https://github.com/Moddable-OpenSource/moddable/releases/tag/OS200903

generic

Heap buffer overflow at moddable/xs/sources/xsSyntaxical.c:3562 · Issue #432 · Moddable-OpenSource/moddable · GitHub

https://github.com/Moddable-OpenSource/moddable/issues/432

Weakness Classification(1)

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

CWE-787Out-of-bounds Write

Data Freshness Timeline

(refreshed 13× in last 7d / 20× 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.

2026-06-08 14:15 UTCEPSS rescore
2026-06-08 14:15 UTCEPSS rescore
2026-06-07 15:23 UTCEPSS rescore
2026-06-07 15:23 UTCEPSS rescore
2026-06-07 11:59 UTCOSV refresh
2026-06-06 13:45 UTCEPSS rescore
2026-06-06 13:45 UTCEPSS rescore
2026-06-05 22:45 UTCEPSS rescore
2026-06-05 22:45 UTCEPSS rescore
2026-06-05 06:08 UTCEPSS rescore
2026-06-05 06:08 UTCEPSS rescore
2026-06-04 13:10 UTCEPSS rescore
2026-06-04 13:10 UTCEPSS rescore
2026-06-02 20:11 UTCEPSS rescore
2026-06-02 20:11 UTCEPSS rescore
2026-06-01 13:50 UTCEPSS rescore
2026-06-01 13:50 UTCEPSS rescore
2026-05-31 22:29 UTCEPSS rescore
2026-05-31 22:29 UTCEPSS rescore
2026-05-31 00:15 UTCEPSS rescore

Frequently asked(5)

What is CVE-2020-25462?

CVE-2020-25462 is a critical vulnerability published on December 4, 2020. Heap buffer overflow in the fxCheckArrowFunction function at moddable/xs/sources/xsSyntaxical.c:3562 in Moddable SDK before OS200903.

When was CVE-2020-25462 disclosed?

CVE-2020-25462 was first published in the National Vulnerability Database on December 4, 2020, with the most recent update on November 21, 2024. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.

Is CVE-2020-25462 actively exploited?

CVE-2020-25462 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 64.5% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2020-25462?

CVE-2020-25462 has a CVSS v3 base score of 9.8 (NVD). The EG score is currently aggregating — additional source signals are being incorporated as they become available..

How do I remediate CVE-2020-25462?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2020-25462, 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

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CVE-2020-25462

📅 Published

🔄 Last Modified

📋 Advisory Details (2)