9.8

CVE-2021-42141: contiki-ng tinydtls

CVSS: 9.8v3.1CriticalModified
Published 22-01-2024Last modified 20-06-2025
Open JSON

Vulnerability summary

CVE-2021-42141 is a critical (CVSS 9.8) vulnerability in contiki-ng tinydtls. EPSS estimates a 1.18% chance of exploitation in the next 30 days, higher than 67.4% of scored vulnerabilities.

Overall risk
70/100
0100
High · default modelHow is this calculated?
CVSS score
9.8/10
010
Critical · v3.1 (NVD)
EPSS score
1.18%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Timeline

  1. 22-01-2024
    PublishedVulnerability first disclosed.
  2. 20-06-2025
    Last modifiedVulnerability information updated.

Description

An issue was discovered in Contiki-NG tinyDTLS through 2018-08-30. One incorrect handshake could complete with different epoch numbers in the packets Client_Hello, Client_key_exchange, and Change_cipher_spec, which may cause denial of service.

CVSS metrics

2 scores · 2 sources · 1 version

EPSS trend

Probability

1.18%

Chance of exploitation in the next 30 days

Percentile

67%

Versus all other CVEs

30-day change

0.00 pp

From 1.18% on 21-09-2026

21-09-202621-10-2026
EPSS score
1.18%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Contiki-ng1 product

1 vendor · 1 product

References

4 links