CVE-2012-5787

Status: ModifiedMedium (5.8)—

The PayPal merchant SDK does not verify that the server hostname matches a domain name in the subject's Common Name (CN) or subjectAltName field of the X.509 certificate, which allows man-in-the-middle attackers to spoof SSL servers via an arbitrary valid certificate.

CVSS

Version: 2.0
Vector: AV:N/AC:M/Au:N/C:P/I:P/A:N
Base score: 5.8

Exploitation probability (EPSS)

Probability of exploitation in the next 30 days: 0.91%
Percentile among all scored CVEs: 59
Score date: 10/3/2026

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)

Paypal — Merchant SDK

CWEs

CWE-20

References

Raw JSON (NVD)

Show

{
  "id": "CVE-2012-5787",
  "cveTags": [],
  "metrics": {
    "cvssMetricV2": [
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "version": "2.0",
          "baseScore": 5.8,
          "accessVector": "NETWORK",
          "vectorString": "AV:N/AC:M/Au:N/C:P/I:P/A:N",
          "authentication": "NONE",
          "integrityImpact": "PARTIAL",
          "accessComplexity": "MEDIUM",
          "availabilityImpact": "NONE",
          "confidentialityImpact": "PARTIAL"
        },
        "acInsufInfo": false,
        "impactScore": 4.9,
        "baseSeverity": "MEDIUM",
        "obtainAllPrivilege": false,
        "exploitabilityScore": 8.6,
        "obtainUserPrivilege": false,
        "obtainOtherPrivilege": false,
        "userInteractionRequired": true
      }
    ]
  },
  "affected": [
    {
      "source": "cve@mitre.org",
      "affectedData": [
        {
          "vendor": "n/a",
          "product": "n/a",
          "versions": [
            {
              "status": "affected",
              "version": "n/a"
            }
          ]
        }
      ]
    }
  ],
  "published": "2012-11-04T22:55:03.497",
  "references": [
    {
      "url": "http://secunia.com/advisories/51184",
      "source": "cve@mitre.org"
    },
    {
      "url": "http://www.cs.utexas.edu/~shmat/shmat_ccs12.pdf",
      "tags": [
        "Exploit"
      ],
      "source": "cve@mitre.org"
    },
    {
      "url": "http://www.securityfocus.com/bid/56445",
      "source": "cve@mitre.org"
    },
    {
      "url": "https://exchange.xforce.ibmcloud.com/vulnerabilities/79913",
      "source": "cve@mitre.org"
    },
    {
      "url": "https://github.com/paypal/SDKs/commit/5f2d6dd77fb4211dcde34e36f1864234526c5d64",
      "source": "cve@mitre.org"
    },
    {
      "url": "http://secunia.com/advisories/51184",
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "http://www.cs.utexas.edu/~shmat/shmat_ccs12.pdf",
      "tags": [
        "Exploit"
      ],
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "http://www.securityfocus.com/bid/56445",
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "https://exchange.xforce.ibmcloud.com/vulnerabilities/79913",
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "https://github.com/paypal/SDKs/commit/5f2d6dd77fb4211dcde34e36f1864234526c5d64",
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    }
  ],
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "CWE-20"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "The PayPal merchant SDK does not verify that the server hostname matches a domain name in the subject's Common Name (CN) or subjectAltName field of the X.509 certificate, which allows man-in-the-middle attackers to spoof SSL servers via an arbitrary valid certificate."
    },
    {
      "lang": "es",
      "value": "La utilidad PayPal merchand SDK no comprueba si el nombre del servidor coincide con un nombre de dominio en el Common Name (CN) del asunto o el campo subjectAltName del certificado X.509, lo que permite a atacantes man-in-the-middle falsificar servidores SSL a través de un certificado válido arbitrario."
    }
  ],
  "lastModified": "2026-06-16T23:47:20.303",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:paypal:merchant_sdk:-:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "60CAB69F-76B9-45E1-87AA-DDA56EAF969C"
            }
          ],
          "operator": "OR"
        }
      ]
    }
  ],
  "sourceIdentifier": "cve@mitre.org"
}