HOME VULNERABILITIESCVE-2021-32771

HIGH

CVE-2021-32771

CWE-120Published: August 4, 2022· Updated: Jun 17, 2026

8.1

CVSS v3.1

Official Description

Contiki-NG is an open-source, cross-platform operating system for IoT devices. In affected versions it is possible to cause a buffer overflow when copying an IPv6 address prefix in the RPL-Classic implementation in Contiki-NG. In order to trigger the vulnerability, the Contiki-NG system must have joined an RPL DODAG. After that, an attacker can send a DAO packet with a Target option that contains a prefix length larger than 128 bits. The problem was fixed after the release of Contiki-NG 4.7. Users unable to upgrade may apply the patch in Contiki-NG PR #1615.

Technical Analysis

CVE-2021-32771 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 8.1.

CVSS v3.1 Vector Breakdown

Exploitability

Attack VectorNetwork

Attack ComplexityHigh

Privileges Req.None

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

CVSS:3.1/AV:N/AC:H/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

Offensive Security exploit database

GitHub PoC Search

Community PoC repositories

Rapid7 / Metasploit

Metasploit module search

Security advisories & exploits

Official NIST entry

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/1615

PATCHhttps://github.com/contiki-ng/contiki-ng/pull/1615/commits/587ae59956e00316fd44fd7072ac3a6a07b4b20f

PATCHhttps://github.com/contiki-ng/contiki-ng/pull/1615

PATCHhttps://github.com/contiki-ng/contiki-ng/pull/1615/commits/587ae59956e00316fd44fd7072ac3a6a07b4b20f

ADVISORYhttps://github.com/contiki-ng/contiki-ng/releases/tag/release%2Fv4.8

ADVISORYhttps://github.com/contiki-ng/contiki-ng/security/advisories/GHSA-jqjf-v7v9-xp6w

ADVISORYhttps://github.com/contiki-ng/contiki-ng/releases/tag/release%2Fv4.8

ADVISORYhttps://github.com/contiki-ng/contiki-ng/security/advisories/GHSA-jqjf-v7v9-xp6w

All References (8)

→

https://github.com/contiki-ng/contiki-ng/pull/1615Patch · Third Party Advisory

→

https://github.com/contiki-ng/contiki-ng/pull/1615/commits/587ae59956e00316fd44fd7072ac3a6a07b4b20fPatch · Third Party Advisory

→

https://github.com/contiki-ng/contiki-ng/releases/tag/release%2Fv4.8Third Party Advisory

→

https://github.com/contiki-ng/contiki-ng/security/advisories/GHSA-jqjf-v7v9-xp6wThird Party Advisory

→

https://github.com/contiki-ng/contiki-ng/pull/1615Patch · Third Party Advisory

→

https://github.com/contiki-ng/contiki-ng/pull/1615/commits/587ae59956e00316fd44fd7072ac3a6a07b4b20fPatch · Third Party Advisory

→

https://github.com/contiki-ng/contiki-ng/releases/tag/release%2Fv4.8Third Party Advisory

→

https://github.com/contiki-ng/contiki-ng/security/advisories/GHSA-jqjf-v7v9-xp6wThird Party Advisory

Quick Facts

CVE IDCVE-2021-32771

CVSS Score8.1 / 10

SeverityHIGH

WeaknessCWE-120

CISA KEVNo

Affected1 vendor(s)

PublishedAug 4, 2022

Related CVEs (CWE-120)

Recommended Actions

→Apply vendor patches immediately
→Monitor CVE-2021-32771 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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