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CVE-2024-43167

Status: DeferredLow (2.8)—

DISPUTE NOTE: this issue does not pose a security risk as it (according to analysis by the original software developer, NLnet Labs) falls within the expected functionality and security controls of the application. Red Hat has made a claim that there is a security risk within Red Hat products. NLnet Labs has no further information about the claim, and suggests that affected Red Hat customers refer to available Red Hat documentation or support channels. ORIGINAL DESCRIPTION: A NULL pointer dereference flaw was found in the ub_ctx_set_fwd function in Unbound.

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This issue could allow an attacker who can invoke specific sequences of API calls to cause a segmentation fault. When certain API functions such as ub_ctx_set_fwd and ub_ctx_resolvconf are called in a particular order, the program attempts to read from a NULL pointer, leading to a crash. This issue can result in a denial of service by causing the application to terminate unexpectedly.

CVSS

Exploitation probability (EPSS)

EPSS (Exploit Prediction Scoring System, FIRST) estimates how likely a vulnerability is to be exploited in the wild within 30 days. It complements CVSS (impact) and CISA KEV (confirmed exploitation).

Affected technologies (1)

⚠ AI-inferred from the description — NVD hasn't analyzed this CVE yet, these aren't verified CPEs.

Nlnetlabs — UnboundAI

CWEs

References

Raw JSON (NVD)

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{
  "id": "CVE-2024-43167",
  "cveTags": [],
  "metrics": {
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        "ssvcData": {
          "id": "CVE-2024-43167",
          "role": "CISA Coordinator",
          "options": [
            {
              "exploitation": "poc"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "version": "2.0.3",
          "timestamp": "2024-08-09T12:53:54.420983Z"
        }
      }
    ],
    "cvssMetricV31": [
      {
        "type": "Secondary",
        "source": "sep@nlnetlabs.nl",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 2.8,
          "attackVector": "LOCAL",
          "baseSeverity": "LOW",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:N/I:N/A:L",
          "integrityImpact": "NONE",
          "userInteraction": "REQUIRED",
          "attackComplexity": "LOW",
          "availabilityImpact": "LOW",
          "privilegesRequired": "LOW",
          "confidentialityImpact": "NONE"
        },
        "impactScore": 1.4,
        "exploitabilityScore": 1.3
      }
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  "affected": [
    {
      "source": "sep@nlnetlabs.nl",
      "affectedData": [
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          "cpes": [
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          "vendor": "Red Hat",
          "product": "Red Hat Enterprise Linux 6",
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          "cpes": [
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          "vendor": "Red Hat",
          "product": "Red Hat Enterprise Linux 8",
          "packageName": "unbound",
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          "defaultStatus": "affected"
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          "cpes": [
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          "product": "Red Hat Enterprise Linux 9",
          "packageName": "unbound",
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        {
          "cpes": [
            "cpe:/a:redhat:openshift:4"
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          "vendor": "Red Hat",
          "product": "Red Hat OpenShift Container Platform 4",
          "packageName": "rhcos",
          "collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
          "defaultStatus": "affected"
        },
        {
          "cpes": [
            "cpe:/a:redhat:openstack:16.2"
          ],
          "vendor": "Red Hat",
          "product": "Red Hat OpenStack Platform 16.2",
          "packageName": "openstack-unbound-container",
          "collectionURL": "https://catalog.redhat.com/software/containers/",
          "defaultStatus": "affected"
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        {
          "cpes": [
            "cpe:/a:redhat:openstack:17.1"
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          "vendor": "Red Hat",
          "product": "Red Hat OpenStack Platform 17.1",
          "packageName": "openstack-unbound-container",
          "collectionURL": "https://catalog.redhat.com/software/containers/",
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          "vendor": "Red Hat",
          "product": "Red Hat OpenStack Platform 18.0",
          "packageName": "openstack-unbound-container",
          "collectionURL": "https://catalog.redhat.com/software/containers/",
          "defaultStatus": "affected"
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  ],
  "published": "2024-08-12T13:38:35.927",
  "references": [
    {
      "url": "https://access.redhat.com/security/cve/CVE-2024-43167",
      "source": "sep@nlnetlabs.nl"
    },
    {
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2303456",
      "source": "sep@nlnetlabs.nl"
    },
    {
      "url": "https://github.com/NLnetLabs/unbound/issues/1072",
      "source": "sep@nlnetlabs.nl"
    },
    {
      "url": "https://github.com/NLnetLabs/unbound/pull/1073/files",
      "source": "sep@nlnetlabs.nl"
    },
    {
      "url": "http://www.openwall.com/lists/oss-security/2024/08/16/6",
      "source": "af854a3a-2127-422b-91ae-364da2661108"
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    {
      "url": "https://lists.debian.org/debian-lts-announce/2024/09/msg00046.html",
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    }
  ],
  "vulnStatus": "Deferred",
  "weaknesses": [
    {
      "type": "Secondary",
      "source": "sep@nlnetlabs.nl",
      "description": [
        {
          "lang": "en",
          "value": "CWE-476"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "DISPUTE NOTE: this issue does not pose a security risk as it (according to analysis by the original software developer, NLnet Labs) falls within the expected functionality and security controls of the application. Red Hat has made a claim that there is a security risk within Red Hat products. NLnet Labs has no further information about the claim, and suggests that affected Red Hat customers refer to available Red Hat documentation or support channels. ORIGINAL DESCRIPTION: A NULL pointer dereference flaw was found in the ub_ctx_set_fwd function in Unbound. This issue could allow an attacker who can invoke specific sequences of API calls to cause a segmentation fault. When certain API functions such as ub_ctx_set_fwd and ub_ctx_resolvconf are called in a particular order, the program attempts to read from a NULL pointer, leading to a crash. This issue can result in a denial of service by causing the application to terminate unexpectedly."
    },
    {
      "lang": "es",
      "value": "Se encontró una falla de desreferencia de puntero NULL en la función ub_ctx_set_fwd en Unbound. Este problema podría permitir que un atacante que pueda invocar secuencias específicas de llamadas API provoque un error de segmentación. Cuando ciertas funciones API como ub_ctx_set_fwd y ub_ctx_resolvconf se llaman en un orden particular, el programa intenta leer desde un puntero NULL, lo que provoca un bloqueo. Este problema puede provocar una denegación de servicio al provocar que la aplicación finalice inesperadamente."
    }
  ],
  "lastModified": "2026-06-17T07:50:33.540",
  "sourceIdentifier": "sep@nlnetlabs.nl"
}