CVE-2012-4929

Status: ModifiedLow (2.6)—💥 PoC

The TLS protocol 1.2 and earlier, as used in Mozilla Firefox, Google Chrome, Qt, and other products, can encrypt 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

Version: 2.0
Vector: AV:N/AC:H/Au:N/C:P/I:N/A:N
Base score: 2.6

Exploitation probability (EPSS)

Probability of exploitation in the next 30 days: 4.35%
Percentile among all scored CVEs: 91
Score date: 10/12/2026

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).

💥 Public exploits

Exploit code or detection templates are publicly available. This is not the same as confirmed active exploitation (KEV), but it raises the risk: patch with priority.

Proof of concept on GitHub (unverified) · List of proofs of concept on GitHub

⚠️ GitHub proofs of concept are not verified: some are fake or contain malware. Never run them outside an isolated lab.

Affected technologies (3)

Debian — Debian Linux Google — Chrome Mozilla — Firefox

CWEs

CWE-310

References

Raw JSON (NVD)

Show

{
  "id": "CVE-2012-4929",
  "cveTags": [],
  "metrics": {
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        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
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          "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": false
      }
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  },
  "affected": [
    {
      "source": "cve@mitre.org",
      "affectedData": [
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          "vendor": "n/a",
          "product": "n/a",
          "versions": [
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              "version": "n/a"
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  ],
  "published": "2012-09-15T18:55:03.187",
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      "url": "http://arstechnica.com/security/2012/09/crime-hijacks-https-sessions/",
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  ],
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "CWE-310"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "The TLS protocol 1.2 and earlier, as used in Mozilla Firefox, Google Chrome, Qt, and other products, can encrypt 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 TLS 1.2 y versiones 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": "2026-06-16T23:45:55.193",
  "configurations": [
    {
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          "operator": "OR"
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}