CVE-2021-42145

HIGHNVD 7.57.5—

7.5

An assertion failure discovered in in check_certificate_request() in Contiki-NG tinyDTLS through master branch 53a0d97 allows attackers to cause a denial of service.

CVSS v3: 7.5
EG Score: 7.5(medium)
EPSS: 18.5%
KEV: Not listed

Published

January 24, 2024

Last Modified

June 20, 2025

References (3)

cve@mitrehttps://seclists.org/fulldisclosure/2024/Jan/18
af854a3a-2127-422b-91ae-364da2661108http://seclists.org/fulldisclosure/2024/Jan/18
af854a3a-2127-422b-91ae-364da2661108https://seclists.org/fulldisclosure/2024/Jan/18

Weakness Classification(1)

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

CWE-755Improper Handling of Exceptional Conditions

Data Freshness Timeline

(refreshed 9× in last 7d / 9× 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
2026-05-27 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
2026-05-26 07:17 UTCepss_batch
2026-05-24 09:42 UTCEG score recompute
2026-05-24 09:42 UTCGHSA enrichment

Frequently asked(5)

What is CVE-2021-42145?

CVE-2021-42145 is a high vulnerability published on January 24, 2024. An assertion failure discovered in in checkcertificaterequest() in Contiki-NG tinyDTLS through master branch 53a0d97 allows attackers to cause a denial of service.

When was CVE-2021-42145 disclosed?

CVE-2021-42145 was first published in the National Vulnerability Database on January 24, 2024, with the most recent update on June 20, 2025. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.

Is CVE-2021-42145 actively exploited?

CVE-2021-42145 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 18.5% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2021-42145?

CVE-2021-42145 has a CVSS v3 base score of 7.5 (NVD).

How do I remediate CVE-2021-42145?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2021-42145, 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

See which npm, PyPI, Go, and Maven packages are affected by CVE-2021-42145

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CVE-2021-42145

📅 Published

🔄 Last Modified

🔗 References (3)