CVE-2007-4990

Estado: ModificadaAlta (7.5)—
The swap_char2b function in X.Org X Font Server (xfs) before 1.0.5 allows context-dependent attackers to execute arbitrary code via (1) QueryXBitmaps and (2) QueryXExtents protocol requests with crafted size values that specify an arbitrary number of bytes to be swapped on the heap, which triggers heap corruption.
CVSS

Versión: 2.0
Vector: AV:N/AC:L/Au:N/C:P/I:P/A:P
Puntuación base: 7.5
Probabilidad de explotación (EPSS)

Probabilidad de explotación en los próximos 30 días: 11%
Percentil entre todas las CVEs puntuadas: 96
Fecha de la puntuación: 6/10/2026
EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).
Tecnologías afectadas (1)

X.org — X Font Server
CWE

CWE-189
Referencias

JSON original (NVD)

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{
  "id": "CVE-2007-4990",
  "cveTags": [],
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        "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": true,
        "userInteractionRequired": false
      }
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      "affectedData": [
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          "vendor": "n/a",
          "product": "n/a",
          "versions": [
            {
              "status": "affected",
              "version": "n/a"
            }
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  "published": "2007-10-05T21:17:00.000",
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      "url": "https://www.redhat.com/archives/fedora-package-announce/2007-December/msg00352.html",
      "source": "af854a3a-2127-422b-91ae-364da2661108"
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  ],
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "CWE-189"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "The swap_char2b function in X.Org X Font Server (xfs) before 1.0.5 allows context-dependent attackers to execute arbitrary code via (1) QueryXBitmaps and (2) QueryXExtents protocol requests with crafted size values that specify an arbitrary number of bytes to be swapped on the heap, which triggers heap corruption."
    },
    {
      "lang": "es",
      "value": "La función swap_char2b de X.Org X Font Server (xfs) anterior a 1.0.5 permite a atacantes locales o remotos (dependiendo del contexto) ejecutar código de su elección mediante peticiones de protocolo (1) QueryXBitmaps y (2) QueryXExtents con valores de tamaño manipulados que especifican un número arbitrario de bytes para ser intercambiados en el montículo, lo que produce una corrupción del montículo."
    }
  ],
  "lastModified": "2026-06-16T22:45:13.960",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:x.org:x_font_server:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "B59B2204-181D-4F87-ACFD-55863DD82311",
              "versionEndIncluding": "1.0.4"
            }
          ],
          "operator": "OR"
        }
      ]
    }
  ],
  "vendorComments": [
    {
      "comment": "Red Hat is aware of this issue and is tracking it via the following bug: https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=CVE-2007-4990\n\nThe Red Hat Security Response Team has rated this issue as having low security impact, a future update may address this flaw.",
      "lastModified": "2007-10-08T00:00:00",
      "organization": "Red Hat"
    }
  ],
  "sourceIdentifier": "cve@mitre.org"
}