How severe is CVE-2023-30421?

CVE-2023-30421 has a CVSS 3.x base score of 2.9, rated low severity. It is exploitable over local access with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability low.

Is CVE-2023-30421 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (3rd percentile), an estimate of the probability of exploitation in the next 30 days.

How do I fix CVE-2023-30421?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2023-30421 have an EU (EUVD) identifier?

Yes. CVE-2023-30421 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2023-34841.

When was CVE-2023-30421 published?

CVE-2023-30421 was published on 2025-04-19 and last updated on 2026-06-17.

CVE-2023-30421

CVE-2023-30421 is a low-severity vulnerability with a CVSS 3.x base score of 2.9. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-407.

Key facts

Severity: Low (CVSS 3.x base score 2.9)
EPSS exploit prediction: 0% (3rd percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2023-34841
Weakness: CWE-407
Published: 2025-04-19
Last modified: 2026-06-17

Description

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

Frequently asked questions

What is CVE-2023-30421?: mystrtod in mjson 1.2.7 requires more than a billion iterations during processing of certain digit strings such as 8891110122900e913013935755114.
How severe is CVE-2023-30421?: CVE-2023-30421 has a CVSS 3.x base score of 2.9, rated low severity. It is exploitable over local access with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability low.
Is CVE-2023-30421 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (3rd percentile), an estimate of the probability of exploitation in the next 30 days.
How do I fix CVE-2023-30421?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2023-30421 have an EU (EUVD) identifier?: Yes. CVE-2023-30421 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2023-34841.
When was CVE-2023-30421 published?: CVE-2023-30421 was published on 2025-04-19 and last updated on 2026-06-17.

References

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