Cyber Resilience

CVE-2021-42147

Critical

Published: 24 January 2024

Published
24 January 2024
Modified
30 May 2025
KEV Added
—
Patch
—
CVSS Score v3.1 9.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
EPSS Score 0.0035 58.1th percentile
Risk Priority 18 60% EPSS · 20% KEV · 20% CVSS

Summary

CVE-2021-42147 is a critical-severity Out-of-bounds Read (CWE-125) vulnerability in Contiki-Ng Tinydtls. Its CVSS base score is 9.1 (Critical).

Operationally, ranked in the top 41.9% of CVEs by exploit likelihood; it is not currently listed in the CISA KEV catalog.

EU & UK References

Vulnerability details

Buffer over-read vulnerability in the dtls_sha256_update function in Contiki-NG tinyDTLS through master branch 53a0d97 allows remote attackers to cause a denial of service via crafted data packet.

CWE(s)
CWE-125

Related Threats

No named actor attribution yet. ATT&CK technique mapping in progress for this CVE.

Affected Assets

contiki-ng
tinydtls
2018-08-30

Mitigating Controls

No mitigating controls mapped yet. The per-CVE control annotator has not reached this CVE.

References