CVE-2021-42142
CRITICALCVSS 9.8/10EPSS 0.99%
Last modified
CVE-2021-42142 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. An issue was discovered in Contiki-NG tinyDTLS through master branch 53a0d97. DTLS servers mishandle the early use of a large epoch number. EPSS estimates a 0.99% chance of exploitation in the next 30 days.
Description
An issue was discovered in Contiki-NG tinyDTLS through master branch 53a0d97. DTLS servers mishandle the early use of a large epoch number. This vulnerability allows remote attackers to cause a denial of service and false-positive packet drops.
Metrics
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Contiki-Ng | Tinydtls | <= 2018-08-30 |
References
- https://github.com/contiki-ng/tinydtls/issues/24Issue Tracking, Patch
- https://seclists.org/fulldisclosure/2024/Jan/15Mailing List, Third Party Advisory
- https://github.com/contiki-ng/tinydtls/issues/24Issue Tracking, Patch
- https://seclists.org/fulldisclosure/2024/Jan/15Mailing List, Third Party Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
What is CVE-2021-42142?
An issue was discovered in Contiki-NG tinyDTLS through master branch 53a0d97. DTLS servers mishandle the early use of a large epoch number. This vulnerability allows remote attackers to cause a denial of service and false-positive packet drops.
How severe is CVE-2021-42142?
CVE-2021-42142 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 0.99% probability of exploitation in the next 30 days.
How do I fix CVE-2021-42142?
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-2021-42142?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST