CVE-2021-42144

CRITICAL

Published Jan 24, 2024 Modified Jun 20, 2025 CWE-125

Description

Buffer over-read vulnerability in Contiki-NG tinyDTLS through master branch 53a0d97 allows attackers obtain sensitive information via crafted input to dtls_ccm_decrypt_message().

Is your site exposed to CVE-2021-42144?

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

CVSS v3.1 Score

9.8

CRITICAL

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

Weakness Type (CWE)

CWE-125 Out-of-bounds Read

Affected Products

Vendor	Product	Versions
contiki-ng	contiki-ng_tinydtls	< 2018-08-30

References

Other References

https://seclists.org/fulldisclosure/2024/Jan/17 http://seclists.org/fulldisclosure/2024/Jan/17 https://seclists.org/fulldisclosure/2024/Jan/17

Frequently Asked Questions

What is CVE-2021-42144? +

Buffer over-read vulnerability in Contiki-NG tinyDTLS through master branch 53a0d97 allows attackers obtain sensitive information via crafted input to dtls_ccm_decrypt_message(). It has a CVSS v3.1 base score of 9.8 (CRITICAL).

How severe is CVE-2021-42144? +

CVE-2021-42144 has a CVSS v3.1 score of 9.8 out of 10, rated CRITICAL. This is a critical vulnerability that should be patched immediately.

What products are affected by CVE-2021-42144? +

CVE-2021-42144 affects products from contiki-ng, specifically: contiki-ng_tinydtls. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2021-42144? +

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-2026-29013

libcoap contains out-of-bounds read vulnerabilities in OSCORE Appendix B.2 CBOR unwrap handling where get_byte_inc() in src/oscore/oscore_cbor.c relies solely on assert() …

CVE-2026-3508

An Out-of-bounds Read vulnerability in the IOCTL handler in ASUS System Control Interface allows a local user to cause system …

CVE-2025-48520

An improper input validation vulnerability within the AMD Platform Management Framework (PMF) driver can allow a local attacker to read …

CVE-2026-3894

Out-of-bounds Read vulnerability in RTI Connext Professional (Core Libraries) allows Overread Buffers.This issue affects Connext Professional: from 7.4.0 before 7.7.0, …

CVE-2025-4098

Horner Automation Cscape version 10.0 (10.0.415.2) SP1 is vulnerable to an out-of-bounds read vulnerability that could allow an attacker to …

CVE-2025-49849

An Out-of-bounds Read vulnerability exists within the parsing of PRJ files. The issues result from the lack of proper validation …