How severe is CVE-2021-42144?

CVE-2021-42144 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2021-42144 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (47th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-42144?

CVE-2021-42144 affects Contiki-ng Contiki-ng Tinydtls. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-42144?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

Does CVE-2021-42144 have an EU (EUVD) identifier?

Yes. CVE-2021-42144 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2021-29127.

When was CVE-2021-42144 published?

CVE-2021-42144 was published on 2024-01-24 and last updated on 2026-06-17.

CVE-2021-42144

CVE-2021-42144 is a critical-severity vulnerability in Contiki-ng Contiki-ng Tinydtls with a CVSS 3.x base score of 9.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-125.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
EPSS exploit prediction: 1% (47th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2021-29127
Weakness: CWE-125
Affected product: Contiki-ng Contiki-ng Tinydtls
Published: 2024-01-24
Last modified: 2026-06-17

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().

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().
How severe is CVE-2021-42144?: CVE-2021-42144 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2021-42144 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (47th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-42144?: CVE-2021-42144 affects Contiki-ng Contiki-ng Tinydtls. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-42144?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
Does CVE-2021-42144 have an EU (EUVD) identifier?: Yes. CVE-2021-42144 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2021-29127.
When was CVE-2021-42144 published?: CVE-2021-42144 was published on 2024-01-24 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:o:contiki-ng:contiki-ng_tinydtls:*:*:*:*:*:*:*:*

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