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CVE-2021-42141

Published: Jan 22, 2024Updated: Jun 20, 2025 Sources: CVE List NVDCWE-755
NVD MITRE
9.8CVSSCRITICAL
EPSS Score
1.2%
Top 36.4%
CISA KEV
Not in KEV
Exploits
1 Known
Remediation
Patch Available

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 Vector Breakdown

AV:NAC:LPR:NUI:NS:UC:HI:HA:H
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:HConfidentiality
High
I:HIntegrity
High
A:HAvailability
High
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Weaknesses

CWE-755

Affected Products

tinydtlscontiki-ng
Embedded
Operating Systems / rtos-embedded-os
n/an/a
contiki-ngoss-projectOperating Systemsaka contiki-ng., tinydtls

Exploitability

1 exploit source identified

Exploit details including PoC links, Metasploit modules, and scanner templates are available after registration.

View exploit details
Official Patch Available

References

http://packetstormsecurity.com/files/176625/Contiki-NG-tinyDTLS-Denial-Of-Service.html
packetstormsecurity.com
https://github.com/contiki-ng/tinydtls/issues/27
github.com
https://seclists.org/fulldisclosure/2024/Jan/14
seclists.org
and 1 more references View all →

Timeline

Published
Jan 22, 2024
Last Updated
Jun 20, 2025

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