CVE-2021-42143

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.

Category

9.1
CVSS
Severity: Critical
CVSS 3.1 •
EPSS 0.26%
Third-Party Advisory seclists.org
Affected: n/a n/a
Published at:
Updated at:

References

Link Tags
https://seclists.org/fulldisclosure/2024/Jan/16 third party advisory mailing list
http://seclists.org/fulldisclosure/2024/Jan/16

Frequently Asked Questions

What is the severity of CVE-2021-42143?
CVE-2021-42143 has been scored as a critical severity vulnerability.
How to fix CVE-2021-42143?
To fix CVE-2021-42143, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2021-42143 being actively exploited in the wild?
As for now, there are no information to confirm that CVE-2021-42143 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
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