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CVE-2015-6831

Status: ModifiedHigh (7.3)—
Severity7.3High · CVSS 3.1
Exploitation probability7.06 %higher than 94% of CVEs
Active exploitationNonot in the CISA catalog
Public exploitNot knownno public code found

Multiple use-after-free vulnerabilities in SPL in PHP before 5.4.44, 5.5.x before 5.5.28, and 5.6.x before 5.6.12 allow remote attackers to execute arbitrary code via vectors involving (1) ArrayObject, (2) SplObjectStorage, and (3) SplDoublyLinkedList, which are mishandled during unserialization.

CVSS

Base score
7.3
Version
3.1
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L

Exploitation probability (EPSS)

Probability of exploitation in the next 30 days
7.06 %
Percentile among all scored CVEs
94
Score date
10/21/2026

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 (2)

Debian — Debian LinuxPHP — PHP

CWEs

References

Show 18 references

Raw JSON (NVD)

Show
{
  "id": "CVE-2015-6831",
  "cveTags": [],
  "metrics": {
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        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
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          "baseScore": 7.5,
          "accessVector": "NETWORK",
          "vectorString": "AV:N/AC:L/Au:N/C:P/I:P/A:P",
          "authentication": "NONE",
          "integrityImpact": "PARTIAL",
          "accessComplexity": "LOW",
          "availabilityImpact": "PARTIAL",
          "confidentialityImpact": "PARTIAL"
        },
        "acInsufInfo": false,
        "impactScore": 6.4,
        "baseSeverity": "HIGH",
        "obtainAllPrivilege": false,
        "exploitabilityScore": 10,
        "obtainUserPrivilege": false,
        "obtainOtherPrivilege": false
      }
    ],
    "cvssMetricV31": [
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
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          "attackVector": "NETWORK",
          "baseSeverity": "HIGH",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L",
          "integrityImpact": "LOW",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "LOW",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "LOW"
        },
        "impactScore": 3.4,
        "exploitabilityScore": 3.9
      }
    ]
  },
  "affected": [
    {
      "source": "security@opentext.com",
      "affectedData": [
        {
          "vendor": "n/a",
          "product": "n/a",
          "versions": [
            {
              "status": "affected",
              "version": "n/a"
            }
          ]
        }
      ]
    }
  ],
  "published": "2016-01-19T05:59:02.637",
  "references": [
    {
      "url": "http://www.debian.org/security/2015/dsa-3344",
      "source": "security@opentext.com"
    },
    {
      "url": "http://www.openwall.com/lists/oss-security/2015/08/19/3",
      "source": "security@opentext.com"
    },
    {
      "url": "http://www.php.net/ChangeLog-5.php",
      "source": "security@opentext.com"
    },
    {
      "url": "http://www.securityfocus.com/bid/76737",
      "source": "security@opentext.com"
    },
    {
      "url": "https://bugs.php.net/bug.php?id=70155",
      "source": "security@opentext.com"
    },
    {
      "url": "https://bugs.php.net/bug.php?id=70166",
      "source": "security@opentext.com"
    },
    {
      "url": "https://bugs.php.net/bug.php?id=70168",
      "source": "security@opentext.com"
    },
    {
      "url": "https://bugs.php.net/bug.php?id=70169",
      "source": "security@opentext.com"
    },
    {
      "url": "https://security.gentoo.org/glsa/201606-10",
      "source": "security@opentext.com"
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    {
      "url": "http://www.debian.org/security/2015/dsa-3344",
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "http://www.openwall.com/lists/oss-security/2015/08/19/3",
      "source": "af854a3a-2127-422b-91ae-364da2661108"
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    {
      "url": "http://www.php.net/ChangeLog-5.php",
      "source": "af854a3a-2127-422b-91ae-364da2661108"
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    {
      "url": "http://www.securityfocus.com/bid/76737",
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "https://bugs.php.net/bug.php?id=70155",
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "https://bugs.php.net/bug.php?id=70166",
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "https://bugs.php.net/bug.php?id=70168",
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "https://bugs.php.net/bug.php?id=70169",
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "https://security.gentoo.org/glsa/201606-10",
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    }
  ],
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "CWE-416"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "Multiple use-after-free vulnerabilities in SPL in PHP before 5.4.44, 5.5.x before 5.5.28, and 5.6.x before 5.6.12 allow remote attackers to execute arbitrary code via vectors involving (1) ArrayObject, (2) SplObjectStorage, and (3) SplDoublyLinkedList, which are mishandled during unserialization."
    },
    {
      "lang": "es",
      "value": "Múltiples vulnerabilidades de uso después de liberación de memoria en SPL en PHP en versiones anteriores a 5.4.44, 5.5.x en versiones anteriores a 5.5.28 y 5.6.x en versiones anteriores a 5.6.12 permiten a atacantes remotos ejecutar código arbitrario involucrando vectores (1) ArrayObject, (2) SplObjectStorage y (3) SplDoublyLinkedList, los cuales no son manejados adecuadamente durante la deserialización."
    }
  ],
  "lastModified": "2026-06-17T00:31:29.833",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
            {
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              "vulnerable": true,
              "matchCriteriaId": "A03A31A6-4CAC-4229-A1E4-FDC785765646",
              "versionEndExcluding": "5.4.44"
            },
            {
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              "vulnerable": true,
              "matchCriteriaId": "B9C0D35D-0789-471F-9252-FB4233D7E1F1",
              "versionEndExcluding": "5.5.28",
              "versionStartIncluding": "5.5.0"
            },
            {
              "criteria": "cpe:2.3:a:php:php:*:*:*:*:*:*:*:*",
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              "versionEndExcluding": "5.6.12",
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            }
          ],
          "operator": "OR"
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    {
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          "cpeMatch": [
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              "matchCriteriaId": "16F59A04-14CF-49E2-9973-645477EA09DA"
            },
            {
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              "vulnerable": true,
              "matchCriteriaId": "C11E6FB0-C8C0-4527-9AA0-CB9B316F8F43"
            }
          ],
          "operator": "OR"
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  ],
  "sourceIdentifier": "security@opentext.com"
}