HOMEVULNERABILITIESCVE-2021-21282
CRITICAL

CVE-2021-21282

CWE-120Published: June 18, 2021· Updated: Jun 17, 2026

9.8
CVSS v3.1

Official Description

Contiki-NG is an open-source, cross-platform operating system for internet of things devices. In versions prior to 4.5, buffer overflow can be triggered by an input packet when using either of Contiki-NG's two RPL implementations in source-routing mode. The problem has been patched in Contiki-NG 4.5. Users can apply the patch for this vulnerability out-of-band as a workaround.

NVD Source

Technical Analysis

CVE-2021-21282 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
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
External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

PATCHhttps://github.com/contiki-ng/contiki-ng/pull/1183
PATCHhttps://github.com/contiki-ng/contiki-ng/security/advisories/GHSA-6xf2-77gf-fgjx
PATCHhttps://github.com/contiki-ng/contiki-ng/pull/1183
PATCHhttps://github.com/contiki-ng/contiki-ng/security/advisories/GHSA-6xf2-77gf-fgjx

All References (4)

→
https://github.com/contiki-ng/contiki-ng/pull/1183Patch · Third Party Advisory
→
https://github.com/contiki-ng/contiki-ng/security/advisories/GHSA-6xf2-77gf-fgjxPatch · Third Party Advisory
→
https://github.com/contiki-ng/contiki-ng/pull/1183Patch · Third Party Advisory
→
https://github.com/contiki-ng/contiki-ng/security/advisories/GHSA-6xf2-77gf-fgjxPatch · Third Party Advisory

Quick Facts

CVE IDCVE-2021-21282
CVSS Score9.8 / 10
SeverityCRITICAL
WeaknessCWE-120
CISA KEVNo
Affected1 vendor(s)
PublishedJun 18, 2021

Related CVEs (CWE-120)

CVE-2011-4862
10.0
CVE-2001-0191
10.0
CVE-2023-4260
10.0
CVE-2024-25139
10.0
CVE-2007-1770
10.0
CVE-2025-9962
10.0

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2021-21282 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.
← All Vulnerabilities·Search for CVE-2021-21282·NVD