What is CVE-2021-42146?

CVE-2021-42146 is a high-severity vulnerability in Contiki-Ng Tinydtls, classified under Improper Handling of Exceptional Conditions. CVSS score: 7.5/10. Published 2024-01-24.

How severe is CVE-2021-42146?

High severity. CVSS v3 base score is 7.5 out of 10.

Vulnerability in Contiki-Ng Tinydtls

CVE-2021-42146

An issue was discovered in Contiki-NG tinyDTLS through master branch 53a0d97. DTLS servers allow remote attackers to reuse the same epoch number within two times the TCP maximum segment lifetime, which is prohibited in RFC6347. This vulnerability allows remote attackers to obtain sensitive application (data of connected clients).

Published 2024-01-24 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N.

EPSS exploit prediction

EPSS: 0.007 (49.7th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 50th percentile — 49.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.007 · newest: 0.007 · change: 0.000

Affected products

Contiki-Ng Tinydtls — versions 2018-08-30

Weakness classification (CWE)

References

seclists.org/fulldisclosure/2024/Jan/19 (Mailing List, Third Party Advisory)
af854a3a-2127-422b-91ae-364da2661108

Frequently asked questions

What is CVE-2021-42146?: CVE-2021-42146 is a high-severity vulnerability in Contiki-Ng Tinydtls, classified under Improper Handling of Exceptional Conditions. CVSS score: 7.5/10. Published 2024-01-24.
How severe is CVE-2021-42146?: High severity. CVSS v3 base score is 7.5 out of 10.