What’s Vulnerable › Vulnerabilities

CVE-2021-42143

• Severity: critical (CVSS 9.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.8% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2024-01-24 · updated 2026-06-17
• Weakness: CWE-835

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.

Affected products

• contiki-ng Tinydtls: through 2018-08-30

References

• https://seclists.org/fulldisclosure/2024/Jan/16
• http://seclists.org/fulldisclosure/2024/Jan/16
• https://seclists.org/fulldisclosure/2024/Jan/16

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