Vulnerability-Lookup

CVE-2021-32771 (GCVE-0-2021-32771)

Vulnerability from cvelistv5 – Published: 2022-08-04 20:25 – Updated: 2025-04-23 17:53

Title

Buffer overflow in contiki-ng

Summary

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.

Severity

8.1 (High)


                        
                          CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

SSVC

Exploitation: none Automatable: no Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2025-04-23 15:51 UTC

CWE

CWE-120 - Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')

Assigner

GitHub_M mitre root

References

4 references

URL	Tags
https://github.com/contiki-ng/contiki-ng/security…	x_refsource_CONFIRM
https://github.com/contiki-ng/contiki-ng/pull/1615	x_refsource_MISC
https://github.com/contiki-ng/contiki-ng/pull/161…	x_refsource_MISC
https://github.com/contiki-ng/contiki-ng/releases…	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version	CPE status
contiki-ng	contiki-ng	Affected: < 4.8	guessed

Show details on NVD website

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FKIE_CVE-2021-32771

Vulnerability from fkie_nvd - Published: 2022-08-04 21:15 - Updated: 2026-06-17 03:53

Severity

8.1 (High) - CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
8.1 (High) - CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

Summary

References

URL	Tags
security-advisories@github.com	https://github.com/contiki-ng/contiki-ng/pull/1615	Patch, Third Party Advisory
security-advisories@github.com	https://github.com/contiki-ng/contiki-ng/pull/1615/commits/587ae59956e00316fd44fd7072ac3a6a07b4b20f	Patch, Third Party Advisory
security-advisories@github.com	https://github.com/contiki-ng/contiki-ng/releases/tag/release%2Fv4.8	Third Party Advisory
security-advisories@github.com	https://github.com/contiki-ng/contiki-ng/security/advisories/GHSA-jqjf-v7v9-xp6w	Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108	https://github.com/contiki-ng/contiki-ng/pull/1615	Patch, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108	https://github.com/contiki-ng/contiki-ng/pull/1615/commits/587ae59956e00316fd44fd7072ac3a6a07b4b20f	Patch, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108	https://github.com/contiki-ng/contiki-ng/releases/tag/release%2Fv4.8	Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108	https://github.com/contiki-ng/contiki-ng/security/advisories/GHSA-jqjf-v7v9-xp6w	Third Party Advisory

Impacted products

	Vendor	Product	Version
	contiki-ng	contiki-ng	*

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "contiki-ng",
          "vendor": "contiki-ng",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 4.8"
            }
          ]
        }
      ],
      "source": "security-advisories@github.com"
    }
  ],
  "configurations": [
    {
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              "matchCriteriaId": "8753C87C-46B4-467B-9598-30E562D5CB38",
              "versionEndExcluding": "4.8",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "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."
    },
    {
      "lang": "es",
      "value": "Contiki-NG es un sistema operativo de c\u00f3digo abierto y multiplataforma para dispositivos IoT. En las versiones afectadas es posible causar un desbordamiento de b\u00fafer cuando es copiado un prefijo de direcci\u00f3n IPv6 en la implementaci\u00f3n RPL-Classic en Contiki-NG. Para desencadenar la vulnerabilidad, el sistema Contiki-NG debe haberse unido a un DODAG RPL. Despu\u00e9s, un atacante puede enviar un paquete DAO con una opci\u00f3n Target que contenga una longitud de prefijo superior a 128 bits. El problema ha sido solucionado tras el lanzamiento de Contiki-NG versi\u00f3n 4.7. Los usuarios que no puedan actualizar pueden aplicar el parche en Contiki-NG PR #1615"
    }
  ],
  "id": "CVE-2021-32771",
  "lastModified": "2026-06-17T03:53:35.790",
  "metrics": {
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        "source": "nvd@nist.gov",
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    "ssvcV203": [
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        "ssvcData": {
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  "vulnStatus": "Modified",
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      ],
      "source": "security-advisories@github.com",
      "type": "Secondary"
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  ]
}

GSD-2021-32771

Vulnerability from gsd - Updated: 2023-12-13 01:23

Details

Aliases

CVE-2021-32771

Aliases

CVE-2021-32771

JSON

To clipboard

{
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    "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.",
    "id": "GSD-2021-32771"
  },
  "gsd": {
    "metadata": {
      "exploitCode": "unknown",
      "remediation": "unknown",
      "reportConfidence": "confirmed",
      "type": "vulnerability"
    },
    "osvSchema": {
      "aliases": [
        "CVE-2021-32771"
      ],
      "details": "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.",
      "id": "GSD-2021-32771",
      "modified": "2023-12-13T01:23:09.025807Z",
      "schema_version": "1.4.0"
    }
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      },
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          "vendor_data": [
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}

VAR-202208-0257

Vulnerability from variot - Updated: 2023-12-18 13:00

Show details on source website

JSON

To clipboard

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Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

Action not permitted

CVE-2021-32771 (GCVE-0-2021-32771)

FKIE_CVE-2021-32771

GSD-2021-32771

VAR-202208-0257

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Related by attack behaviour