What’s Vulnerable › Vulnerabilities

CVE-2021-42141

• Severity: critical (CVSS 9.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2024-01-22 · updated 2026-06-17
• Weakness: CWE-755

Description

An issue was discovered in Contiki-NG tinyDTLS through 2018-08-30. One incorrect handshake could complete with different epoch numbers in the packets Client_Hello, Client_key_exchange, and Change_cipher_spec, which may cause denial of service.

Affected products

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

References

• http://packetstormsecurity.com/files/176625/Contiki-NG-tinyDTLS-Denial-Of-Service.html
• https://github.com/contiki-ng/tinydtls/issues/27
• https://seclists.org/fulldisclosure/2024/Jan/14
• http://packetstormsecurity.com/files/176625/Contiki-NG-tinyDTLS-Denial-Of-Service.html
• http://seclists.org/fulldisclosure/2024/Jan/14
• https://github.com/contiki-ng/tinydtls/issues/27
• https://seclists.org/fulldisclosure/2024/Jan/14

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