FKIE_CVE-2021-42147

Vulnerability from fkie_nvd - Published: 2024-01-24 19:15 - Updated: 2026-06-17 04:09
Severity
9.1 (Critical) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
9.1 (Critical) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
Summary
Buffer over-read vulnerability in the dtls_sha256_update function in Contiki-NG tinyDTLS through master branch 53a0d97 allows remote attackers to cause a denial of service via crafted data packet.
References
cve@mitre.orghttps://seclists.org/fulldisclosure/2024/Jan/20Mailing List, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108http://seclists.org/fulldisclosure/2024/Jan/20
af854a3a-2127-422b-91ae-364da2661108https://seclists.org/fulldisclosure/2024/Jan/20Mailing List, Third Party Advisory
Impacted products
Vendor Product Version
contiki-ng tinydtls 2018-08-30
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "n/a",
          "vendor": "n/a",
          "versions": [
            {
              "status": "affected",
              "version": "n/a"
            }
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      ],
      "source": "cve@mitre.org"
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  ],
  "configurations": [
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              "criteria": "cpe:2.3:a:contiki-ng:tinydtls:2018-08-30:*:*:*:*:*:*:*",
              "matchCriteriaId": "90402650-48E8-4C88-9306-B32811E56046",
              "vulnerable": true
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  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "Buffer over-read vulnerability in the dtls_sha256_update function in Contiki-NG tinyDTLS through master branch 53a0d97 allows remote attackers to cause a denial of service via crafted data packet."
    },
    {
      "lang": "es",
      "value": "Vulnerabilidad de lectura excesiva del b\u00fafer en la funci\u00f3n dtls_sha256_update en Contiki-NG tinyDTLS a trav\u00e9s de la rama maestra 53a0d97 permite a atacantes remotos provocar una denegaci\u00f3n de servicio a trav\u00e9s de un paquete de datos manipulado."
    }
  ],
  "id": "CVE-2021-42147",
  "lastModified": "2026-06-17T04:09:26.083",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "HIGH",
          "baseScore": 9.1,
          "baseSeverity": "CRITICAL",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "NONE",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H",
          "version": "3.1"
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        "impactScore": 5.2,
        "source": "nvd@nist.gov",
        "type": "Primary"
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          "confidentialityImpact": "HIGH",
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          "userInteraction": "NONE",
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    "ssvcV203": [
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        "ssvcData": {
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          "options": [
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              "exploitation": "none"
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            {
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            {
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          "role": "CISA Coordinator",
          "timestamp": "2025-05-08T17:27:48.683986Z",
          "version": "2.0.3"
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  "published": "2024-01-24T19:15:08.530",
  "references": [
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      "source": "cve@mitre.org",
      "tags": [
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      "url": "https://seclists.org/fulldisclosure/2024/Jan/20"
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  "sourceIdentifier": "cve@mitre.org",
  "vulnStatus": "Modified",
  "weaknesses": [
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          "lang": "en",
          "value": "CWE-125"
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      "type": "Secondary"
    }
  ]
}


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Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

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.