CVE-2021-24025
Estado: ModificadaCrítica (9.8)—
Due to incorrect string size calculations inside the preg_quote function, a large input string passed to the function can trigger an integer overflow leading to a heap overflow. This issue affects HHVM versions prior to 4.56.3, all versions between 4.57.0 and 4.80.1, all versions between 4.81.0 and 4.93.1, and versions 4.94.0, 4.95.0, 4.96.0, 4.97.0, 4.98.0.
CVSS
- Versión: 3.1
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- Puntuación base: 9.8
Probabilidad de explotación (EPSS)
- Probabilidad de explotación en los próximos 30 días: 1.66%
- Percentil entre todas las CVEs puntuadas: 76
- 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)
CWE
- CWE-122
- CWE-190
Referencias
JSON original (NVD)
Mostrar
{
"id": "CVE-2021-24025",
"cveTags": [],
"metrics": {
"cvssMetricV2": [
{
"type": "Primary",
"source": "nvd@nist.gov",
"cvssData": {
"version": "2.0",
"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": false,
"userInteractionRequired": false
}
],
"cvssMetricV31": [
{
"type": "Primary",
"source": "nvd@nist.gov",
"cvssData": {
"scope": "UNCHANGED",
"version": "3.1",
"baseScore": 9.8,
"attackVector": "NETWORK",
"baseSeverity": "CRITICAL",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
"integrityImpact": "HIGH",
"userInteraction": "NONE",
"attackComplexity": "LOW",
"availabilityImpact": "HIGH",
"privilegesRequired": "NONE",
"confidentialityImpact": "HIGH"
},
"impactScore": 5.9,
"exploitabilityScore": 3.9
}
]
},
"affected": [
{
"source": "cve-assign@fb.com",
"affectedData": [
{
"vendor": "Facebook",
"product": "HHVM",
"versions": [
{
"status": "unaffected",
"version": "4.98.1",
"lessThan": "unspecified",
"versionType": "custom"
},
{
"status": "affected",
"version": "4.98.0"
},
{
"status": "unaffected",
"version": "4.97.1",
"lessThan": "unspecified",
"versionType": "custom"
},
{
"status": "affected",
"version": "4.97.0"
},
{
"status": "unaffected",
"version": "4.96.1",
"lessThan": "unspecified",
"versionType": "custom"
},
{
"status": "affected",
"version": "4.96.0"
},
{
"status": "unaffected",
"version": "4.95.1",
"lessThan": "unspecified",
"versionType": "custom"
},
{
"status": "affected",
"version": "4.95.0"
},
{
"status": "unaffected",
"version": "4.94.1",
"lessThan": "unspecified",
"versionType": "custom"
},
{
"status": "affected",
"version": "4.94.0"
},
{
"status": "unaffected",
"version": "4.93.2",
"lessThan": "unspecified",
"versionType": "custom"
},
{
"status": "affected",
"version": "4.81.0",
"lessThan": "unspecified",
"versionType": "custom"
},
{
"status": "unaffected",
"version": "4.80.2",
"lessThan": "unspecified",
"versionType": "custom"
},
{
"status": "affected",
"version": "4.57.0",
"lessThan": "unspecified",
"versionType": "custom"
},
{
"status": "unaffected",
"version": "4.56.3",
"lessThan": "unspecified",
"versionType": "custom"
},
{
"status": "affected",
"version": "unspecified",
"lessThan": "4.56.3",
"versionType": "custom"
}
]
}
]
}
],
"published": "2021-03-10T16:15:16.750",
"references": [
{
"url": "https://github.com/facebook/hhvm/commit/08193b7f0cd3910256e00d599f0f3eb2519c44ca",
"tags": [
"Patch",
"Third Party Advisory"
],
"source": "cve-assign@fb.com"
},
{
"url": "https://hhvm.com/blog/2021/02/25/security-update.html",
"tags": [
"Release Notes",
"Third Party Advisory"
],
"source": "cve-assign@fb.com"
},
{
"url": "https://github.com/facebook/hhvm/commit/08193b7f0cd3910256e00d599f0f3eb2519c44ca",
"tags": [
"Patch",
"Third Party Advisory"
],
"source": "af854a3a-2127-422b-91ae-364da2661108"
},
{
"url": "https://hhvm.com/blog/2021/02/25/security-update.html",
"tags": [
"Release Notes",
"Third Party Advisory"
],
"source": "af854a3a-2127-422b-91ae-364da2661108"
}
],
"vulnStatus": "Modified",
"weaknesses": [
{
"type": "Secondary",
"source": "cve-assign@fb.com",
"description": [
{
"lang": "en",
"value": "CWE-122"
}
]
},
{
"type": "Primary",
"source": "nvd@nist.gov",
"description": [
{
"lang": "en",
"value": "CWE-190"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "Due to incorrect string size calculations inside the preg_quote function, a large input string passed to the function can trigger an integer overflow leading to a heap overflow. This issue affects HHVM versions prior to 4.56.3, all versions between 4.57.0 and 4.80.1, all versions between 4.81.0 and 4.93.1, and versions 4.94.0, 4.95.0, 4.96.0, 4.97.0, 4.98.0."
},
{
"lang": "es",
"value": "Debido a cálculos de tamaño de cadena incorrectos dentro de la función preg_quote, una cadena de entrada grande pasada a la función puede desencadenar un desbordamiento de enteros que conlleva a un desbordamiento de la pila. Este problema afecta a versiones de HHVM anteriores a 4.56.3, todas las versiones entre 4.57.0 y 4.80.1, todas las versiones entre 4.81.0 y 4.93.1 y versiones 4.94.0, 4.95.0, 4.96.0, 4.97.0 , 4.98.0"
}
],
"lastModified": "2026-06-17T03:39:10.890",
"configurations": [
{
"nodes": [
{
"negate": false,
"cpeMatch": [
{
"criteria": "cpe:2.3:a:facebook:hhvm:*:*:*:*:*:*:*:*",
"vulnerable": true,
"matchCriteriaId": "069C0B7D-5233-4EFF-BBA7-8B84D9227044",
"versionEndExcluding": "4.56.3"
},
{
"criteria": "cpe:2.3:a:facebook:hhvm:*:*:*:*:*:*:*:*",
"vulnerable": true,
"matchCriteriaId": "F5E6E1A7-225A-4C45-9E2D-5ED55BA3AEA3",
"versionEndIncluding": "4.80.1",
"versionStartIncluding": "4.57.0"
},
{
"criteria": "cpe:2.3:a:facebook:hhvm:*:*:*:*:*:*:*:*",
"vulnerable": true,
"matchCriteriaId": "9470E6A8-E2CB-4C72-8FEF-5CFF04E7E3C3",
"versionEndIncluding": "4.93.1",
"versionStartIncluding": "4.81.0"
},
{
"criteria": "cpe:2.3:a:facebook:hhvm:4.94.0:*:*:*:*:*:*:*",
"vulnerable": true,
"matchCriteriaId": "1C4B9A3C-6A5A-45C4-A490-C13CF6D6A867"
},
{
"criteria": "cpe:2.3:a:facebook:hhvm:4.95.0:*:*:*:*:*:*:*",
"vulnerable": true,
"matchCriteriaId": "18D33DC0-E6A7-4DC6-8E9A-2B85842EC21B"
},
{
"criteria": "cpe:2.3:a:facebook:hhvm:4.96.0:*:*:*:*:*:*:*",
"vulnerable": true,
"matchCriteriaId": "B0B9078D-3C25-45B2-B5F2-59585A47BACB"
},
{
"criteria": "cpe:2.3:a:facebook:hhvm:4.97.0:*:*:*:*:*:*:*",
"vulnerable": true,
"matchCriteriaId": "7B8F5C11-8610-4099-8A45-E6241F3D24E0"
},
{
"criteria": "cpe:2.3:a:facebook:hhvm:4.98.0:*:*:*:*:*:*:*",
"vulnerable": true,
"matchCriteriaId": "47FF13C3-19DC-4F53-BF9D-38AC89D647D5"
}
],
"operator": "OR"
}
]
}
],
"sourceIdentifier": "cve-assign@fb.com"
}