HOMEVULNERABILITIESCVE-2021-42142
CRITICAL

CVE-2021-42142

CWE-755Published: January 23, 2024· Updated: Jun 17, 2026

9.8
CVSS v3.1

Official Description

An issue was discovered in Contiki-NG tinyDTLS through master branch 53a0d97. DTLS servers mishandle the early use of a large epoch number. This vulnerability allows remote attackers to cause a denial of service and false-positive packet drops.

NVD Source

Technical Analysis

CVE-2021-42142 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 9.8.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorNetwork
Attack ComplexityLow
Privileges Req.None
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected Vendors & Products

contiki-ng1 product(s)
tinydtls
Source: NVD CPE · 1 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
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Official Patches & Advisories

PATCHhttps://github.com/contiki-ng/tinydtls/issues/24
PATCHhttps://github.com/contiki-ng/tinydtls/issues/24
ADVISORYhttps://seclists.org/fulldisclosure/2024/Jan/15
ADVISORYhttps://seclists.org/fulldisclosure/2024/Jan/15

All References (5)

→
https://github.com/contiki-ng/tinydtls/issues/24Issue Tracking · Patch
→
https://seclists.org/fulldisclosure/2024/Jan/15Mailing List · Third Party Advisory
→
http://seclists.org/fulldisclosure/2024/Jan/15
→
https://github.com/contiki-ng/tinydtls/issues/24Issue Tracking · Patch
→
https://seclists.org/fulldisclosure/2024/Jan/15Mailing List · Third Party Advisory

Quick Facts

CVE IDCVE-2021-42142
CVSS Score9.8 / 10
SeverityCRITICAL
WeaknessCWE-755
CISA KEVNo
Affected1 vendor(s)
PublishedJan 23, 2024

Related CVEs (CWE-755)

CVE-2017-2877
9.8
CVE-2019-17195
9.8
CVE-2023-6267
9.8
CVE-2021-42141
9.8
CVE-2019-12815
9.8
CVE-2023-27595
9.8

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2021-42142 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.
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