CVE-2023-30421

LOWNVD 2.92.9—Elevated

2.9

mystrtod in mjson 1.2.7 requires more than a billion iterations during processing of certain digit strings such as 8891110122900e913013935755114.

CVSS v3: 2.9
EG Score: 2.9(medium)
EPSS: 17.3%
KEV: Not listed

Published

April 19, 2025

Last Modified

April 15, 2026

References (2)

cve@mitrehttps://github.com/boofish/json_bugs/blob/main/mjson
cve@mitrehttps://github.com/cesanta/mjson/releases

Weakness Classification(1)

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

CWE-407

Data Freshness Timeline

(refreshed 9× in last 7d / 20× 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.

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Frequently asked(5)

What is CVE-2023-30421?

CVE-2023-30421 is a low vulnerability published on April 19, 2025. mystrtod in mjson 1.2.7 requires more than a billion iterations during processing of certain digit strings such as 8891110122900e913013935755114.

When was CVE-2023-30421 disclosed?

CVE-2023-30421 was first published in the National Vulnerability Database on April 19, 2025, with the most recent update on April 15, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.

Is CVE-2023-30421 actively exploited?

CVE-2023-30421 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 17.3% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2023-30421?

CVE-2023-30421 has a CVSS v3 base score of 2.9 (NVD).

How do I remediate CVE-2023-30421?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2023-30421, 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-2023-30421

📅 Published

🔄 Last Modified

🔗 References (2)

Weakness Classification(1)

Data Freshness Timeline

❓ Frequently asked(5)

Dependency Blast Radius

Is Your Infrastructure Affected by CVE-2023-30421?

🔗 Related CVEs(same CWE)

Same CWE

Published

Last Modified

References (2)

Frequently asked(5)

Related CVEs(same CWE)