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CVE-2012-4930

Status: ModifiedLow (2.6)—

The SPDY protocol 3 and earlier, as used in Mozilla Firefox, Google Chrome, and other products, can perform TLS encryption of compressed data without properly obfuscating the length of the unencrypted data, which allows man-in-the-middle attackers to obtain plaintext HTTP headers by observing length differences during a series of guesses in which a string in an HTTP request potentially matches an unknown string in an HTTP header, aka a "CRIME" attack.

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 (2)

Google — ChromeMozilla — Firefox

CWEs

References

Raw JSON (NVD)

Show
{
  "id": "CVE-2012-4930",
  "cveTags": [],
  "metrics": {
    "cvssMetricV2": [
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "version": "2.0",
          "baseScore": 2.6,
          "accessVector": "NETWORK",
          "vectorString": "AV:N/AC:H/Au:N/C:P/I:N/A:N",
          "authentication": "NONE",
          "integrityImpact": "NONE",
          "accessComplexity": "HIGH",
          "availabilityImpact": "NONE",
          "confidentialityImpact": "PARTIAL"
        },
        "acInsufInfo": false,
        "impactScore": 2.9,
        "baseSeverity": "LOW",
        "obtainAllPrivilege": false,
        "exploitabilityScore": 4.9,
        "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": "2012-09-15T18:55:03.250",
  "references": [
    {
      "url": "http://arstechnica.com/security/2012/09/crime-hijacks-https-sessions/",
      "source": "cve@mitre.org"
    },
    {
      "url": "http://isecpartners.com/blog/2012/9/14/details-on-the-crime-attack.html",
      "source": "cve@mitre.org"
    },
    {
      "url": "http://lists.opensuse.org/opensuse-security-announce/2012-10/msg00010.html",
      "source": "cve@mitre.org"
    },
    {
      "url": "http://threatpost.com/en_us/blogs/crime-attack-uses-compression-ratio-tls-requests-side-channel-hijack-secure-sessions-091312",
      "source": "cve@mitre.org"
    },
    {
      "url": "http://www.ekoparty.org/2012/thai-duong.php",
      "source": "cve@mitre.org"
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    {
      "url": "http://www.iacr.org/cryptodb/data/paper.php?pubkey=3091",
      "source": "cve@mitre.org"
    },
    {
      "url": "http://www.theregister.co.uk/2012/09/14/crime_tls_attack/",
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    {
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=857737",
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    {
      "url": "https://community.qualys.com/blogs/securitylabs/2012/09/14/crime-information-leakage-attack-against-ssltls",
      "source": "cve@mitre.org"
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    {
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      "source": "af854a3a-2127-422b-91ae-364da2661108"
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      "source": "af854a3a-2127-422b-91ae-364da2661108"
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      "url": "http://www.iacr.org/cryptodb/data/paper.php?pubkey=3091",
      "source": "af854a3a-2127-422b-91ae-364da2661108"
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    {
      "url": "http://www.theregister.co.uk/2012/09/14/crime_tls_attack/",
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=857737",
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "https://community.qualys.com/blogs/securitylabs/2012/09/14/crime-information-leakage-attack-against-ssltls",
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    }
  ],
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "CWE-310"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "The SPDY protocol 3 and earlier, as used in Mozilla Firefox, Google Chrome, and other products, can perform TLS encryption of compressed data without properly obfuscating the length of the unencrypted data, which allows man-in-the-middle attackers to obtain plaintext HTTP headers by observing length differences during a series of guesses in which a string in an HTTP request potentially matches an unknown string in an HTTP header, aka a \"CRIME\" attack."
    },
    {
      "lang": "es",
      "value": "El protocolo SPDY 3 y anteriores, como el usado en Mozilla Firefox, Google Chrome, y otros productos, puede hacer cifrados TLS de datos comprimidos sin ofuscar de forma adecuada la longitud de los datos no cifrado, lo que permte a atacantes man-in-the-middle obtener cabeceras HTTP en texto plano observando las diferencias de longitud durante una serie de previsiones en la cual una cadena en una petición HTTP potencialmente coincide con una cadena desconocida en una cabecera HTPP, también conocido como ataque \"CRIME\"."
    }
  ],
  "lastModified": "2026-06-16T23:45:55.440",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
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          "operator": "OR"
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  "sourceIdentifier": "cve@mitre.org"
}