CVE-2009-1086

Status: ModifiedMedium (6.4)—

Heap-based buffer overflow in the ldns_rr_new_frm_str_internal function in ldns 1.4.x allows remote attackers to cause a denial of service (memory corruption) and possibly execute arbitrary code via a DNS resource record (RR) with a long (1) class field (clas variable) and possibly (2) TTL field.

CVSS

Version: 2.0
Vector: AV:N/AC:L/Au:N/C:N/I:P/A:P
Base score: 6.4

Exploitation probability (EPSS)

Probability of exploitation in the next 30 days: 3.47%
Percentile among all scored CVEs: 89
Score date: 10/6/2026

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)

Nlnetlabs — Ldns

CWEs

CWE-399

References

Raw JSON (NVD)

Show

{
  "id": "CVE-2009-1086",
  "cveTags": [],
  "metrics": {
    "cvssMetricV2": [
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "version": "2.0",
          "baseScore": 6.4,
          "accessVector": "NETWORK",
          "vectorString": "AV:N/AC:L/Au:N/C:N/I:P/A:P",
          "authentication": "NONE",
          "integrityImpact": "PARTIAL",
          "accessComplexity": "LOW",
          "availabilityImpact": "PARTIAL",
          "confidentialityImpact": "NONE"
        },
        "acInsufInfo": false,
        "impactScore": 4.9,
        "baseSeverity": "MEDIUM",
        "obtainAllPrivilege": false,
        "exploitabilityScore": 10,
        "obtainUserPrivilege": false,
        "obtainOtherPrivilege": false,
        "userInteractionRequired": false
      }
    ]
  },
  "affected": [
    {
      "source": "cve@mitre.org",
      "affectedData": [
        {
          "vendor": "n/a",
          "product": "n/a",
          "versions": [
            {
              "status": "affected",
              "version": "n/a"
            }
          ]
        }
      ]
    }
  ],
  "published": "2009-03-25T18:30:00.547",
  "references": [
    {
      "url": "http://lists.opensuse.org/opensuse-security-announce/2009-05/msg00000.html",
      "source": "cve@mitre.org"
    },
    {
      "url": "http://secunia.com/advisories/35013",
      "source": "cve@mitre.org"
    },
    {
      "url": "http://secunia.com/advisories/35065",
      "source": "cve@mitre.org"
    },
    {
      "url": "http://www.debian.org/security/2009/dsa-1795",
      "source": "cve@mitre.org"
    },
    {
      "url": "http://www.nlnetlabs.nl/bugs/show_bug.cgi?id=232",
      "source": "cve@mitre.org"
    },
    {
      "url": "http://www.nlnetlabs.nl/svn/ldns/tags/release-1.5.0/Changelog",
      "source": "cve@mitre.org"
    },
    {
      "url": "http://www.openwall.com/lists/oss-security/2009/03/24/4",
      "source": "cve@mitre.org"
    },
    {
      "url": "http://www.securityfocus.com/bid/34233",
      "source": "cve@mitre.org"
    },
    {
      "url": "http://lists.opensuse.org/opensuse-security-announce/2009-05/msg00000.html",
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "http://secunia.com/advisories/35013",
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "http://secunia.com/advisories/35065",
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "http://www.debian.org/security/2009/dsa-1795",
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "http://www.nlnetlabs.nl/bugs/show_bug.cgi?id=232",
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "http://www.nlnetlabs.nl/svn/ldns/tags/release-1.5.0/Changelog",
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "http://www.openwall.com/lists/oss-security/2009/03/24/4",
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "http://www.securityfocus.com/bid/34233",
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    }
  ],
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "CWE-399"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "Heap-based buffer overflow in the ldns_rr_new_frm_str_internal function in ldns 1.4.x allows remote attackers to cause a denial of service (memory corruption) and possibly execute arbitrary code via a DNS resource record (RR) with a long (1) class field (clas variable) and possibly (2) TTL field."
    },
    {
      "lang": "es",
      "value": "Desbordamiento de búfer basado en montículo en la función ldns_rr_new_frm_str_internal  en ldns  v1.4.x, permite a atacantes remotos provocar una denegación de servicio (corrupción de memoria) y posiblemente la ejecución de código de su elección a través de un registro de recurso (RR) con un (1) campo \"class\"  (variable \"class\") largo y posiblemente con (2) un campo largo TTL."
    }
  ],
  "lastModified": "2026-06-16T23:06:28.450",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:nlnetlabs:ldns:1.4.0:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "7036E2A8-39EB-45D1-B0A5-80C35F737281"
            },
            {
              "criteria": "cpe:2.3:a:nlnetlabs:ldns:1.4.1:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "2B747B09-4C10-4F06-9E75-08C220ABED84"
            }
          ],
          "operator": "OR"
        }
      ]
    }
  ],
  "sourceIdentifier": "cve@mitre.org"
}