VULNERABILITY INTELLIGENCE

CVE-2021-42143

CVSS score9.1 CRITICAL
EPSS probability0.81%
CISA KEVNot currently listed
Published2024-01-24
Last modified2026-06-17
CVSS vectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H

Description

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.

Weakness classification

  • nvd@nist.gov: CWE-835
  • 134c704f-9b21-4f2e-91b3-4a467353bcc0: CWE-835

Primary references