CVE-2021-42145

HIGH
Published Jan 24, 2024 Modified Jun 20, 2025 CWE-755

Description

An assertion failure discovered in in check_certificate_request() in Contiki-NG tinyDTLS through master branch 53a0d97 allows attackers to cause a denial of service.

Is your site exposed to CVE-2021-42145?

Run a free security scan — no signup, results in seconds.

CVSS v3.1 Score

7.5
HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Weakness Type (CWE)

CWE-755 CWE-755

Affected Products

Vendor Product
contiki-ng tinydtls

References

Frequently Asked Questions

What is CVE-2021-42145? +
An assertion failure discovered in in check_certificate_request() in Contiki-NG tinyDTLS through master branch 53a0d97 allows attackers to cause a denial of service. It has a CVSS v3.1 base score of 7.5 (HIGH).
How severe is CVE-2021-42145? +
CVE-2021-42145 has a CVSS v3.1 score of 7.5 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching.
What products are affected by CVE-2021-42145? +
CVE-2021-42145 affects products from contiki-ng, specifically: tinydtls. Check the affected products table above for specific version ranges.
How do I check if I'm vulnerable to CVE-2021-42145? +
You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

Related Vulnerabilities

CVE-2025-24478

A denial-of-service vulnerability exists in the affected products. The vulnerability could allow a remote, non-privileged user to send malicious requests …
CVE-2024-47609

Tonic is a native gRPC client & server implementation with async/await support. When using tonic::transport::Server there is a remote DoS …
CVE-2025-9437

A security issue exists within the Studio 5000 Logix Designer add-on profile (AOP) for the ArmorStart Classic distributed motor controller, …
CVE-2024-51502

loona is an experimental, HTTP/1.1 and HTTP/2 implementation in Rust on top of io-uring. `loona-hpack` suffers from the same vulnerability …
CVE-2024-41886

Team ENVY, a Security Research TEAM has found a flaw that allows for a remote code execution on the NVR. …
CVE-2026-49232

Routinator exits on any error when accepting incoming HTTP or RTR connections, including ones it can recover from such as …

Don't wait for an exploit

Scan your website for vulnerabilities like CVE-2021-42145 — free, no signup required.