CVE-2021-42147 Denial of service in n/a

Critical 9.1 Published 24 Jan 2024 Updated 30 May 2025

Remote attackers can cause denial of service in Contiki-NG tinyDTLS via crafted data packets exploiting a buffer over-read.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Over the internet
Victim action needed: Not needed
Fix: None listed

What is CVE-2021-42147?

CVE-2021-42147 is a critical denial of service vulnerability in n/a, published on 24 Jan 2024. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

Buffer over-read vulnerability in the dtls_sha256_update function in Contiki-NG tinyDTLS through master branch 53a0d97 allows remote attackers to cause a denial of service via crafted data packet.

Weakness: CWE-125

Which versions are affected by CVE-2021-42147?

It affects 1 product.

Products include Contiki-Ng Tinydtls.

How do I fix CVE-2021-42147?

No fix has been published for CVE-2021-42147 yet. Limit exposure of the affected software until one is available.

Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.

Is CVE-2021-42147 being exploited?

There is no known exploitation of CVE-2021-42147 in the wild and no public exploit code.

Sources

Also known as GHSA-9vpc-ch84-fc8h.