CVE-2021-42141

Name: CVE-2021-42141
Creator: NVD / NIST
Published: 2024-01-22T23:15:08.12+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.8/10EPSS 1.18%

Last modified Jun 17, 2026

CVE-2021-42141 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. 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.. EPSS estimates a 1.18% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

9.8/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS Probability

1.18%

63.8th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Contiki-Ng	Tinydtls	<= 2018-08-30

References

http://packetstormsecurity.com/files/176625/Contiki-NG-tinyDTLS-Denial-Of-Service.htmlThird Party Advisory, VDB Entry
https://github.com/contiki-ng/tinydtls/issues/27Patch
https://seclists.org/fulldisclosure/2024/Jan/14Mailing List, Third Party Advisory
http://packetstormsecurity.com/files/176625/Contiki-NG-tinyDTLS-Denial-Of-Service.htmlThird Party Advisory, VDB Entry
http://seclists.org/fulldisclosure/2024/Jan/14
https://github.com/contiki-ng/tinydtls/issues/27Patch
https://seclists.org/fulldisclosure/2024/Jan/14Mailing List, Third Party Advisory

Timeline

Published: Jan 22, 2024
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-42141?

How severe is CVE-2021-42141?

CVE-2021-42141 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 1.18% probability of exploitation in the next 30 days.

How do I fix CVE-2021-42141?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-42141?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST