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CVE-2021-34999

Estado: AnalizadaMedia (5.5)—

OpenBSD Kernel Multicast Routing Uninitialized Memory Information Disclosure Vulnerability. This vulnerability allows local attackers to disclose sensitive information on affected installations of OpenBSD Kernel. An attacker must first obtain the ability to execute low-privileged code on the target system in order to exploit this vulnerability.

The specific flaw exists within the implementation of multicast routing. The issue results from the lack of proper initialization of memory prior to accessing it. An attacker can leverage this in conjunction with other vulnerabilities to escalate privileges and execute arbitrary code in the context of the kernel. . Was ZDI-CAN-14540.

CVSS

Probabilidad de explotación (EPSS)

EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).

Tecnologías afectadas (1)

Openbsd — Openbsd

CWE

Referencias

JSON original (NVD)

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  "id": "CVE-2021-34999",
  "cveTags": [],
  "metrics": {
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        "ssvcData": {
          "id": "CVE-2021-34999",
          "role": "CISA Coordinator",
          "options": [
            {
              "exploitation": "none"
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            {
              "automatable": "no"
            },
            {
              "technicalImpact": "total"
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          "version": "2.0.3",
          "timestamp": "2024-05-08T15:31:35.373260Z"
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        "cvssData": {
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          "baseSeverity": "LOW",
          "vectorString": "CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:C/C:L/I:N/A:N",
          "integrityImpact": "NONE",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
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          "privilegesRequired": "LOW",
          "confidentialityImpact": "LOW"
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          "integrityImpact": "NONE",
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  "published": "2024-05-07T23:15:13.750",
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  "vulnStatus": "Analyzed",
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      "description": [
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          "lang": "en",
          "value": "CWE-908"
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  "descriptions": [
    {
      "lang": "en",
      "value": "OpenBSD Kernel Multicast Routing Uninitialized Memory Information Disclosure Vulnerability. This vulnerability allows local attackers to disclose sensitive information on affected installations of OpenBSD Kernel. An attacker must first obtain the ability to execute low-privileged code on the target system in order to exploit this vulnerability.\n\nThe specific flaw exists within the implementation of multicast routing. The issue results from the lack of proper initialization of memory prior to accessing it. An attacker can leverage this in conjunction with other vulnerabilities to escalate privileges and execute arbitrary code in the context of the kernel.\n. Was ZDI-CAN-14540."
    },
    {
      "lang": "es",
      "value": "Vulnerabilidad de divulgación de información de memoria no inicializada de enrutamiento de multidifusión del kernel de OpenBSD. Esta vulnerabilidad permite a atacantes locales revelar información confidencial sobre las instalaciones afectadas de OpenBSD Kernel. Un atacante primero debe obtener la capacidad de ejecutar código con pocos privilegios en el sistema de destino para poder explotar esta vulnerabilidad. La falla específica existe en la implementación del enrutamiento de multidifusión. El problema se debe a la falta de una inicialización adecuada de la memoria antes de acceder a ella. Un atacante puede aprovechar esto junto con otras vulnerabilidades para escalar privilegios y ejecutar código arbitrario en el contexto del kernel. Era ZDI-CAN-14540."
    }
  ],
  "lastModified": "2026-06-17T03:56:57.440",
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