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CVE-2021-42146

Published: Jan 24, 2024Updated: Jun 20, 2025 Sources: CVE List NVDCWE-755
NVD MITRE
7.5CVSSHIGH
EPSS Score
0.7%
Top 53.3%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
No Fix Available

Description

An issue was discovered in Contiki-NG tinyDTLS through master branch 53a0d97. DTLS servers allow remote attackers to reuse the same epoch number within two times the TCP maximum segment lifetime, which is prohibited in RFC6347. This vulnerability allows remote attackers to obtain sensitive application (data of connected clients).

CVSS Vector Breakdown

AV:NAC:LPR:NUI:NS:UC:HI:NA:N
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:NIntegrity
None
A:NAvailability
None
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Weaknesses

CWE-755CWE-303

Affected Products

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

Exploitability

No known exploits, KEV entries, or remediation guidance available for this vulnerability yet.

References

https://seclists.org/fulldisclosure/2024/Jan/19
seclists.org
http://seclists.org/fulldisclosure/2024/Jan/19
seclists.org

Timeline

Published
Jan 24, 2024
Last Updated
Jun 20, 2025

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