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CVE-2022-2928

Estado: ModificadaMedia (6.5)—

In ISC DHCP 4.4.0 -> 4.4.3, ISC DHCP 4.1-ESV-R1 -> 4.1-ESV-R16-P1, when the function option_code_hash_lookup() is called from add_option(), it increases the option's refcount field. However, there is not a corresponding call to option_dereference() to decrement the refcount field. The function add_option() is only used in server responses to lease query packets. Each lease query response calls this function for several options, so eventually, the reference counters could overflow and cause the server to abort.

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 (3)

Debian — Debian LinuxFedoraproject — FedoraISC — Dhcp

CWE

Referencias

JSON original (NVD)

Mostrar
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  "id": "CVE-2022-2928",
  "cveTags": [],
  "metrics": {
    "cvssMetricV31": [
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        "type": "Secondary",
        "source": "security-officer@isc.org",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 6.5,
          "attackVector": "ADJACENT_NETWORK",
          "baseSeverity": "MEDIUM",
          "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
          "integrityImpact": "NONE",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "NONE"
        },
        "impactScore": 3.6,
        "exploitabilityScore": 2.8
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          "integrityImpact": "NONE",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "NONE"
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        "impactScore": 3.6,
        "exploitabilityScore": 2.8
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  "affected": [
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      "source": "security-officer@isc.org",
      "affectedData": [
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          "vendor": "ISC",
          "product": "ISC DHCP",
          "versions": [
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              "status": "affected",
              "version": "4.4.0 through versions before 4.4.3-P1"
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              "version": "4.1 ESV 4.1-ESV-R1 through versions before 4.1-ESV-R16-P1"
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  "published": "2022-10-07T05:15:08.677",
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      "url": "https://kb.isc.org/docs/cve-2022-2928",
      "tags": [
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      "source": "security-officer@isc.org"
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  "vulnStatus": "Modified",
  "weaknesses": [
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      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "CWE-476"
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      "lang": "en",
      "value": "In ISC DHCP 4.4.0 -> 4.4.3, ISC DHCP 4.1-ESV-R1 -> 4.1-ESV-R16-P1, when the function option_code_hash_lookup() is called from add_option(), it increases the option's refcount field. However, there is not a corresponding call to option_dereference() to decrement the refcount field. The function add_option() is only used in server responses to lease query packets. Each lease query response calls this function for several options, so eventually, the reference counters could overflow and cause the server to abort."
    },
    {
      "lang": "es",
      "value": "En ISC DHCP versiones 4.4.0 anteriores a 4.4.3, ISC DHCP versiones 4.1-ESV-R1 anteriores a 4.1-ESV-R16-P1, cuando la función option_code_hash_lookup() es llamada desde add_option(), incrementa el campo refcount de la opción. Sin embargo, no se presenta una llamada correspondiente a option_dereference() para disminuir el campo refcount. La función add_option() sólo es usada en las respuestas del servidor a paquetes de consulta de arrendamiento. Cada respuesta de consulta de arrendamiento llama a esta función para varias opciones, por lo que eventualmente, los contadores de referencia podrían desbordarse y causar a el servidor abortar"
    }
  ],
  "lastModified": "2026-06-17T04:42:50.170",
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