What is CVE-2021-42143?

CVE-2021-42143 is a critical-severity vulnerability in Contiki-Ng Tinydtls, classified under Loop with Unreachable Exit Condition (Infinite Loop). CVSS score: 9.1/10. Published 2024-01-24.

How severe is CVE-2021-42143?

Critical severity. CVSS v3 base score is 9.1 out of 10.

Vulnerability in Contiki-Ng Tinydtls

CVE-2021-42143

An issue was discovered in Contiki-NG tinyDTLS through master branch 53a0d97. An infinite loop bug exists during the handling of a ClientHello handshake message. This bug allows remote attackers to cause a denial of service by sending a malformed ClientHello handshake message with an odd length of cipher suites, which triggers an infinite loop (consuming all resources) and a buffer over-read that can disclose sensitive information.

EPSS: 0.008 (53.3th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.1 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H.

Affected products

Contiki-ng Tinydtls
N/a — versions n/a

Weakness classification (CWE)

CWE-835 — Loop with Unreachable Exit Condition (Infinite Loop)

References

cve@mitre.org (Mailing List, Third Party Advisory)
af854a3a-2127-422b-91ae-364da2661108

Frequently asked questions

What is CVE-2021-42143?: CVE-2021-42143 is a critical-severity vulnerability in Contiki-Ng Tinydtls, classified under Loop with Unreachable Exit Condition (Infinite Loop). CVSS score: 9.1/10. Published 2024-01-24.
How severe is CVE-2021-42143?: Critical severity. CVSS v3 base score is 9.1 out of 10.