CVE-2020-23257

HIGHNVD 7.57.5—

7.5

Buffer Overflow vulnerability found in Espruino 2v05.41 allows an attacker to cause a denial of service via the function jsvGarbageCollectMarkUsed in file src/jsvar.c.

CVSS v3: 7.5
EG Score: 7.5(medium)
EPSS: 64.6%
KEV: Not listed

Published

April 4, 2023

Last Modified

February 13, 2025

References (4)

cve@mitrehttp://www.espruino.com/
cve@mitrehttps://github.com/espruino/Espruino/issues/1820
af854a3a-2127-422b-91ae-364da2661108http://www.espruino.com/
af854a3a-2127-422b-91ae-364da2661108https://github.com/espruino/Espruino/issues/1820

Weakness Classification(1)

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

CWE-120Buffer Copy without Checking Size (Classic Buffer Overflow)

Data Freshness Timeline

(refreshed 8× in last 7d / 8× in last 30d)

Every time one of our enrichment pipelines (NVD, MITRE cvelistV5, EPSS, CISA KEV, GHSA, OSV, vendor advisories) ran against this CVE. Most recent first.

2026-05-27 13:39 UTCepss_batch
2026-05-26 13:42 UTCepss_batch
2026-05-26 13:42 UTCepss_batch
2026-05-26 07:17 UTCepss_batch
2026-05-26 07:17 UTCepss_batch
2026-05-25 03:51 UTCEG score recompute
2026-05-25 03:51 UTCGHSA enrichment
2026-05-24 16:48 UTCepss_batch

Frequently asked(5)

What is CVE-2020-23257?

CVE-2020-23257 is a high vulnerability published on April 4, 2023. Buffer Overflow vulnerability found in Espruino 2v05.41 allows an attacker to cause a denial of service via the function jsvGarbageCollectMarkUsed in file src/jsvar.c.

When was CVE-2020-23257 disclosed?

CVE-2020-23257 was first published in the National Vulnerability Database on April 4, 2023, with the most recent update on February 13, 2025. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.

Is CVE-2020-23257 actively exploited?

CVE-2020-23257 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 64.6% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2020-23257?

CVE-2020-23257 has a CVSS v3 base score of 7.5 (NVD).

How do I remediate CVE-2020-23257?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2020-23257, 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-2020-23257

📅 Published

🔄 Last Modified

🔗 References (4)