HOMEVULNERABILITIESCVE-2020-24336
CRITICAL

CVE-2020-24336

CWE-120Published: December 11, 2020· Updated: Jun 17, 2026

9.8
CVSS v3.1

Official Description

An issue was discovered in Contiki through 3.0 and Contiki-NG through 4.5. The code for parsing Type A domain name answers in ip64-dns64.c doesn't verify whether the address in the answer's length is sane. Therefore, when copying an address of an arbitrary length, a buffer overflow can occur. This bug can be exploited whenever NAT64 is enabled.

NVD Source

Technical Analysis

CVE-2020-24336 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)
contiki-ng
contiki-os1 product(s)
contiki
Source: NVD CPE · 2 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
External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

ADVISORYhttps://us-cert.cisa.gov/ics/advisories/icsa-20-343-01
ADVISORYhttps://www.kb.cert.org/vuls/id/815128
ADVISORYhttps://us-cert.cisa.gov/ics/advisories/icsa-20-343-01
ADVISORYhttps://www.kb.cert.org/vuls/id/815128

All References (4)

→
https://us-cert.cisa.gov/ics/advisories/icsa-20-343-01Third Party Advisory · US Government Resource
→
https://www.kb.cert.org/vuls/id/815128Third Party Advisory · US Government Resource
→
https://us-cert.cisa.gov/ics/advisories/icsa-20-343-01Third Party Advisory · US Government Resource
→
https://www.kb.cert.org/vuls/id/815128Third Party Advisory · US Government Resource

Quick Facts

CVE IDCVE-2020-24336
CVSS Score9.8 / 10
SeverityCRITICAL
WeaknessCWE-120
CISA KEVNo
Affected2 vendor(s)
PublishedDec 11, 2020

Related CVEs (CWE-120)

CVE-2022-22570
10.0
CVE-2010-10016
10.0
CVE-1999-0385
10.0
CVE-2001-0191
10.0
CVE-2012-10035
10.0
CVE-2022-31481
10.0

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2020-24336 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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