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CVE-2020-29573

Estado: ModificadaAlta (7.5)—

sysdeps/i386/ldbl2mpn.c in the GNU C Library (aka glibc or libc6) before 2.23 on x86 targets has a stack-based buffer overflow if the input to any of the printf family of functions is an 80-bit long double with a non-canonical bit pattern, as seen when passing a \x00\x04\x00\x00\x00\x00\x00\x00\x00\x04 value to sprintf. NOTE: the issue does not affect glibc by default in 2016 or later (i.e., 2.23 or later) because of commits made in 2015 for inlining of C99 math functions through use of GCC built-ins. In other words, the reference to 2.23 is intentional despite the mention of "Fixed for glibc 2.33" in the 26649 reference.

CVSS

Probabilidad de explotación (EPSS)

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 (4)

GNU — GlibcNetapp — Cloud BackupNetapp — Solidfire Baseboard Management ControllerRedhat — Enterprise Linux

CWE

Referencias

JSON original (NVD)

Mostrar
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          "accessVector": "NETWORK",
          "vectorString": "AV:N/AC:L/Au:N/C:N/I:N/A:P",
          "authentication": "NONE",
          "integrityImpact": "NONE",
          "accessComplexity": "LOW",
          "availabilityImpact": "PARTIAL",
          "confidentialityImpact": "NONE"
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        "acInsufInfo": false,
        "impactScore": 2.9,
        "baseSeverity": "MEDIUM",
        "obtainAllPrivilege": false,
        "exploitabilityScore": 10,
        "obtainUserPrivilege": false,
        "obtainOtherPrivilege": false,
        "userInteractionRequired": false
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          "baseSeverity": "HIGH",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
          "integrityImpact": "NONE",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "NONE",
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  "published": "2020-12-06T00:15:11.567",
  "references": [
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      "tags": [
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  "vulnStatus": "Modified",
  "weaknesses": [
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          "value": "CWE-787"
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      "value": "sysdeps/i386/ldbl2mpn.c in the GNU C Library (aka glibc or libc6) before 2.23 on x86 targets has a stack-based buffer overflow if the input to any of the printf family of functions is an 80-bit long double with a non-canonical bit pattern, as seen when passing a \\x00\\x04\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x04 value to sprintf. NOTE: the issue does not affect glibc by default in 2016 or later (i.e., 2.23 or later) because of commits made in 2015 for inlining of C99 math functions through use of GCC built-ins. In other words, the reference to 2.23 is intentional despite the mention of \"Fixed for glibc 2.33\" in the 26649 reference."
    },
    {
      "lang": "es",
      "value": "El archivo sysdeps/i386/ldbl2mpn.c en la GNU C Library (también se conoce como glibc o libc6) versiones anteriores a 2.23 en objetivos x86 presenta un desbordamiento de búfer en la región stack de la memoria si la entrada a cualquiera de la familia funciones printf es un doble longitud de 80 bits con un patrón de bits no canónico, como se ve al pasar un valor \\x00\\x04\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x04 a sprintf. NOTA: la cuestión no afecta a la glibc por defecto en 2016 o más tarde (es decir, 2,23 o más tarde), debido a los compromisos contraídos en 2015 para alinear las funciones matemáticas del C99 mediante el uso de los elementos incorporados del GCC. En otras palabras, la referencia a 2.23 es intencional a pesar de la mención de \"Fijado para glibc 2.33\" en la referencia 26649"
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  "lastModified": "2026-06-17T03:11:27.550",
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