CVE-2021-36173
Estado: ModificadaAlta (8.8)—
A heap-based buffer overflow in the firmware signature verification function of FortiOS versions 7.0.1, 7.0.0, 6.4.0 through 6.4.6, 6.2.0 through 6.2.9, and 6.0.0 through 6.0.13 may allow an attacker to execute arbitrary code via specially crafted installation images.
CVSS
- Versión: 3.1
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
- Puntuación base: 8.8
Probabilidad de explotación (EPSS)
- Probabilidad de explotación en los próximos 30 días: 1.55%
- Percentil entre todas las CVEs puntuadas: 74
- Fecha de la puntuación: 7/10/2026
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-787
Referencias
JSON original (NVD)
Mostrar
{
"id": "CVE-2021-36173",
"cveTags": [],
"metrics": {
"ssvcV203": [
{
"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"ssvcData": {
"id": "CVE-2021-36173",
"role": "CISA Coordinator",
"options": [
{
"exploitation": "none"
},
{
"automatable": "no"
},
{
"technicalImpact": "total"
}
],
"version": "2.0.3",
"timestamp": "2024-10-23T14:13:07.677380Z"
}
}
],
"cvssMetricV2": [
{
"type": "Primary",
"source": "nvd@nist.gov",
"cvssData": {
"version": "2.0",
"baseScore": 6.8,
"accessVector": "NETWORK",
"vectorString": "AV:N/AC:M/Au:N/C:P/I:P/A:P",
"authentication": "NONE",
"integrityImpact": "PARTIAL",
"accessComplexity": "MEDIUM",
"availabilityImpact": "PARTIAL",
"confidentialityImpact": "PARTIAL"
},
"acInsufInfo": false,
"impactScore": 6.4,
"baseSeverity": "MEDIUM",
"obtainAllPrivilege": false,
"exploitabilityScore": 8.6,
"obtainUserPrivilege": false,
"obtainOtherPrivilege": false,
"userInteractionRequired": true
}
],
"cvssMetricV31": [
{
"type": "Secondary",
"source": "psirt@fortinet.com",
"cvssData": {
"scope": "UNCHANGED",
"version": "3.1",
"baseScore": 8,
"attackVector": "ADJACENT_NETWORK",
"baseSeverity": "HIGH",
"vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H",
"integrityImpact": "HIGH",
"userInteraction": "REQUIRED",
"attackComplexity": "LOW",
"availabilityImpact": "HIGH",
"privilegesRequired": "NONE",
"confidentialityImpact": "HIGH"
},
"impactScore": 5.9,
"exploitabilityScore": 2.1
},
{
"type": "Primary",
"source": "nvd@nist.gov",
"cvssData": {
"scope": "UNCHANGED",
"version": "3.1",
"baseScore": 8.8,
"attackVector": "NETWORK",
"baseSeverity": "HIGH",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H",
"integrityImpact": "HIGH",
"userInteraction": "REQUIRED",
"attackComplexity": "LOW",
"availabilityImpact": "HIGH",
"privilegesRequired": "NONE",
"confidentialityImpact": "HIGH"
},
"impactScore": 5.9,
"exploitabilityScore": 2.8
}
]
},
"affected": [
{
"source": "psirt@fortinet.com",
"affectedData": [
{
"vendor": "Fortinet",
"product": "Fortinet FortiOS",
"versions": [
{
"status": "affected",
"version": "FortiOS 7.0.1, 7.0.0, 6.4.0 through 6.4.6, 6.2.0 through 6.2.9, 6.0.0 through 6.0.13"
}
]
}
]
}
],
"published": "2021-12-08T19:15:09.787",
"references": [
{
"url": "https://fortiguard.com/advisory/FG-IR-21-115",
"tags": [
"Patch",
"Vendor Advisory"
],
"source": "psirt@fortinet.com"
},
{
"url": "https://fortiguard.com/advisory/FG-IR-21-115",
"tags": [
"Patch",
"Vendor Advisory"
],
"source": "af854a3a-2127-422b-91ae-364da2661108"
}
],
"vulnStatus": "Modified",
"weaknesses": [
{
"type": "Primary",
"source": "nvd@nist.gov",
"description": [
{
"lang": "en",
"value": "CWE-787"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "A heap-based buffer overflow in the firmware signature verification function of FortiOS versions 7.0.1, 7.0.0, 6.4.0 through 6.4.6, 6.2.0 through 6.2.9, and 6.0.0 through 6.0.13 may allow an attacker to execute arbitrary code via specially crafted installation images."
},
{
"lang": "es",
"value": "Un desbordamiento de búfer en la región heap de la memoria en la función firmware signature verification de FortiOS versiones 7.0.1, 7.0.0, 6.4.0 hasta 6.4.6, 6.2.0 hasta 6.2.9 y 6.0.0 hasta 6.0.13, puede permitir a un atacante ejecutar código arbitrario por medio de imágenes de instalación especialmente diseñadas"
}
],
"lastModified": "2026-06-17T03:58:27.743",
"configurations": [
{
"nodes": [
{
"negate": false,
"cpeMatch": [
{
"criteria": "cpe:2.3:o:fortinet:fortios:*:*:*:*:*:*:*:*",
"vulnerable": true,
"matchCriteriaId": "A6EF01D9-50FB-4300-87FB-132649A9AC51",
"versionEndIncluding": "6.0.13",
"versionStartIncluding": "6.0.0"
},
{
"criteria": "cpe:2.3:o:fortinet:fortios:*:*:*:*:*:*:*:*",
"vulnerable": true,
"matchCriteriaId": "C4C0308D-8E52-456B-BFC2-62D4C1E9BDC3",
"versionEndIncluding": "6.2.9",
"versionStartIncluding": "6.2.0"
},
{
"criteria": "cpe:2.3:o:fortinet:fortios:*:*:*:*:*:*:*:*",
"vulnerable": true,
"matchCriteriaId": "88D6903E-70D0-4D63-BC68-BA37EE91BCB1",
"versionEndIncluding": "6.4.6",
"versionStartIncluding": "6.4.0"
},
{
"criteria": "cpe:2.3:o:fortinet:fortios:7.0.0:*:*:*:*:*:*:*",
"vulnerable": true,
"matchCriteriaId": "79FEE7F6-F72E-4A43-883C-0CF492DF355B"
},
{
"criteria": "cpe:2.3:o:fortinet:fortios:7.0.1:*:*:*:*:*:*:*",
"vulnerable": true,
"matchCriteriaId": "FBDFDF02-2136-4DE0-A19B-FE3654ED90A4"
}
],
"operator": "OR"
},
{
"negate": false,
"cpeMatch": [
{
"criteria": "cpe:2.3:h:fortinet:fortigate-1100e:-:*:*:*:*:*:*:*",
"vulnerable": false,
"matchCriteriaId": "58F428EE-70C1-440F-B16D-45D44A54FB9D"
},
{
"criteria": "cpe:2.3:h:fortinet:fortigate-200f:-:*:*:*:*:*:*:*",
"vulnerable": false,
"matchCriteriaId": "A07781B7-E990-4BF2-A828-441D556FF2DC"
},
{
"criteria": "cpe:2.3:h:fortinet:fortigate-2600f:-:*:*:*:*:*:*:*",
"vulnerable": false,
"matchCriteriaId": "4039DD9E-DAB4-45A4-90A7-50D345038CB9"
},
{
"criteria": "cpe:2.3:h:fortinet:fortigate-3500f:-:*:*:*:*:*:*:*",
"vulnerable": false,
"matchCriteriaId": "A1FD4947-6A13-4C8D-B22C-96D96ACB2363"
},
{
"criteria": "cpe:2.3:h:fortinet:fortigate-400e:-:*:*:*:*:*:*:*",
"vulnerable": false,
"matchCriteriaId": "FB3F963E-1CFE-4C7C-B44B-AF100592002E"
},
{
"criteria": "cpe:2.3:h:fortinet:fortigate-600e:-:*:*:*:*:*:*:*",
"vulnerable": false,
"matchCriteriaId": "F034C1C3-E8D1-4426-BC5E-A6D25E31B497"
},
{
"criteria": "cpe:2.3:h:fortinet:fortigate_1800f:-:*:*:*:*:*:*:*",
"vulnerable": false,
"matchCriteriaId": "76792D6F-B647-43A8-8A60-17BE35824BF7"
},
{
"criteria": "cpe:2.3:h:fortinet:fortigate_2200e:-:*:*:*:*:*:*:*",
"vulnerable": false,
"matchCriteriaId": "0B2A9D43-348B-45DB-94F7-825B29141F09"
},
{
"criteria": "cpe:2.3:h:fortinet:fortigate_3300e:-:*:*:*:*:*:*:*",
"vulnerable": false,
"matchCriteriaId": "0CCCA9CD-2B75-46AF-989C-C300CB53358E"
},
{
"criteria": "cpe:2.3:h:fortinet:fortigate_3600e:-:*:*:*:*:*:*:*",
"vulnerable": false,
"matchCriteriaId": "5015D2E8-8482-467A-96F4-65CBF0AFAC6E"
},
{
"criteria": "cpe:2.3:h:fortinet:fortigate_40f:-:*:*:*:*:*:*:*",
"vulnerable": false,
"matchCriteriaId": "96C31DB1-CEBD-4796-9CF1-5D9D000A5A9A"
},
{
"criteria": "cpe:2.3:h:fortinet:fortigate_60f:-:*:*:*:*:*:*:*",
"vulnerable": false,
"matchCriteriaId": "2D32F0C5-2949-48B6-B9DD-F070DE11C803"
},
{
"criteria": "cpe:2.3:h:fortinet:fortigate_7121f:-:*:*:*:*:*:*:*",
"vulnerable": false,
"matchCriteriaId": "E1663D59-D804-44A4-B768-93BDF60F8DEA"
}
],
"operator": "OR"
}
],
"operator": "AND"
}
],
"sourceIdentifier": "psirt@fortinet.com"
}