CVE-2026-20339
Estado: Pendiente de análisisAlta (7.5)—
A vulnerability in the PESpin file format parser of ClamAV could allow an unauthenticated, remote attacker to cause a DoS condition or possibly other expanded impacts as a result of memory corruption on an affected device.
This vulnerability is due to improper boundary checks for content in PESpin files during scanning, which may result in an integer overflow. An attacker could exploit this vulnerability by submitting a crafted file that contains PESpin content to be scanned by ClamAV on an affected device. A successful exploit could allow the attacker to cause the ClamAV scanning process to terminate, resulting in a DoS condition on the affected software.
CVSS
- Versión: 3.1
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- Puntuación base: 7.5
Probabilidad de explotación (EPSS)
- Probabilidad de explotación en los próximos 30 días: 0.46%
- Percentil entre todas las CVEs puntuadas: 38
- 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).
🎯 Técnicas ATT&CK
Cómo se explota esta vulnerabilidad y qué consigue el atacante, en el lenguaje de MITRE ATT&CK.
- Explotación
T1190Exploit Public-Facing Applicationinitial access90 % - Impacto principal
T1499.004Application or System Exploitationimpact85 % - Impacto secundario
T1068Exploitation for Privilege Escalationprivilege escalation45 %
Vector CVSS AV:N/PR:N/UI:N → acceso remoto sin privilegios ni interacción, encaja T1190. Integer overflow en parser PESpin → DoS principal (T1499.004: consumo de recursos). Memory corruption podría permitir escalada, pero no está explícito.
Inferido por nuestro agente de análisis a partir de la descripción oficial, el vector CVSS y la CWE, y comprobado por un supervisor. Puede contener errores.
🛡️ Mitigaciones ATT&CK que cubren estas técnicas
Tecnologías afectadas (1)
⚠ Inferidas por IA a partir de la descripción — NVD aún no ha analizado esta CVE; no son CPE verificados.
CWE
- CWE-190
Referencias
JSON original (NVD)
Mostrar
{
"id": "CVE-2026-20339",
"cveTags": [],
"metrics": {
"ssvcV203": [
{
"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"ssvcData": {
"id": "CVE-2026-20339",
"role": "CISA Coordinator",
"options": [
{
"exploitation": "none"
},
{
"automatable": "yes"
},
{
"technicalImpact": "partial"
}
],
"version": "2.0.3",
"timestamp": "2026-08-07T20:59:43.966111Z"
}
}
],
"cvssMetricV31": [
{
"type": "Secondary",
"source": "psirt@cisco.com",
"cvssData": {
"scope": "UNCHANGED",
"version": "3.1",
"baseScore": 7.5,
"attackVector": "NETWORK",
"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",
"confidentialityImpact": "NONE"
},
"impactScore": 3.6,
"exploitabilityScore": 3.9
}
]
},
"affected": [
{
"source": "psirt@cisco.com",
"affectedData": [
{
"vendor": "Cisco",
"product": "Cisco Secure Endpoint",
"versions": [
{
"status": "affected",
"version": "7.0.5"
},
{
"status": "affected",
"version": "6.2.19"
},
{
"status": "affected",
"version": "7.3.3"
},
{
"status": "affected",
"version": "7.2.13"
},
{
"status": "affected",
"version": "6.1.5"
},
{
"status": "affected",
"version": "6.3.1"
},
{
"status": "affected",
"version": "6.2.5"
},
{
"status": "affected",
"version": "7.3.5"
},
{
"status": "affected",
"version": "6.2.1"
},
{
"status": "affected",
"version": "7.2.7"
},
{
"status": "affected",
"version": "7.1.1"
},
{
"status": "affected",
"version": "6.3.5"
},
{
"status": "affected",
"version": "6.2.9"
},
{
"status": "affected",
"version": "7.3.1"
},
{
"status": "affected",
"version": "6.1.7"
},
{
"status": "affected",
"version": "7.2.11"
},
{
"status": "affected",
"version": "7.2.3"
},
{
"status": "affected",
"version": "7.1.5"
},
{
"status": "affected",
"version": "6.3.3"
},
{
"status": "affected",
"version": "7.3.9"
},
{
"status": "affected",
"version": "6.2.3"
},
{
"status": "affected",
"version": "6.1.9"
},
{
"status": "affected",
"version": "6.0.9"
},
{
"status": "affected",
"version": "7.2.5"
},
{
"status": "affected",
"version": "6.0.7"
},
{
"status": "affected",
"version": "6.3.7"
},
{
"status": "affected",
"version": "1.12.3"
},
{
"status": "affected",
"version": "1.8.0"
},
{
"status": "affected",
"version": "1.11.1"
},
{
"status": "affected",
"version": "1.12.4"
},
{
"status": "affected",
"version": "1.10.0"
},
{
"status": "affected",
"version": "1.12.0"
},
{
"status": "affected",
"version": "1.8.1"
},
{
"status": "affected",
"version": "1.10.1"
},
{
"status": "affected",
"version": "1.12.1"
},
{
"status": "affected",
"version": "1.12.6"
},
{
"status": "affected",
"version": "1.14.0"
},
{
"status": "affected",
"version": "1.10.2"
},
{
"status": "affected",
"version": "1.12.7"
},
{
"status": "affected",
"version": "1.12.2"
},
{
"status": "affected",
"version": "1.6.0"
},
{
"status": "affected",
"version": "1.9.0"
},
{
"status": "affected",
"version": "1.11.0"
},
{
"status": "affected",
"version": "1.7.0"
},
{
"status": "affected",
"version": "1.13.0"
},
{
"status": "affected",
"version": "1.8.4"
},
{
"status": "affected",
"version": "1.13.1"
},
{
"status": "affected",
"version": "1.9.1"
},
{
"status": "affected",
"version": "1.12.5"
},
{
"status": "affected",
"version": "1.13.2"
},
{
"status": "affected",
"version": "8.1.7.21512"
},
{
"status": "affected",
"version": "8.1.7"
},
{
"status": "affected",
"version": "8.1.5"
},
{
"status": "affected",
"version": "8.1.3.21242"
},
{
"status": "affected",
"version": "8.1.3"
},
{
"status": "affected",
"version": "8.1.5.21322"
},
{
"status": "affected",
"version": "8.1.7.21417"
},
{
"status": "affected",
"version": "1.14.1"
},
{
"status": "affected",
"version": "1.15.1"
},
{
"status": "affected",
"version": "1.15.2"
},
{
"status": "affected",
"version": "1.15.3"
},
{
"status": "affected",
"version": "1.15.4"
},
{
"status": "affected",
"version": "1.15.5"
},
{
"status": "affected",
"version": "1.15.6"
},
{
"status": "affected",
"version": "1.16.0"
},
{
"status": "affected",
"version": "1.16.1"
},
{
"status": "affected",
"version": "1.16.2"
},
{
"status": "affected",
"version": "1.16.3"
},
{
"status": "affected",
"version": "1.18.0"
},
{
"status": "affected",
"version": "1.18.1"
},
{
"status": "affected",
"version": "1.20.0"
},
{
"status": "affected",
"version": "1.21.0"
},
{
"status": "affected",
"version": "1.21.1"
},
{
"status": "affected",
"version": "1.21.2"
},
{
"status": "affected",
"version": "1.21.3"
},
{
"status": "affected",
"version": "1.22.0"
},
{
"status": "affected",
"version": "1.22.1"
},
{
"status": "affected",
"version": "1.22.2"
},
{
"status": "affected",
"version": "1.22.3"
},
{
"status": "affected",
"version": "1.22.4"
},
{
"status": "affected",
"version": "1.24.0"
},
{
"status": "affected",
"version": "1.24.1"
},
{
"status": "affected",
"version": "1.24.2"
},
{
"status": "affected",
"version": "1.24.3"
},
{
"status": "affected",
"version": "1.24.4"
},
{
"status": "affected",
"version": "1.26.0"
},
{
"status": "affected",
"version": "1.24.5"
},
{
"status": "affected",
"version": "1.26.1"
},
{
"status": "affected",
"version": "1.27.0"
},
{
"status": "affected",
"version": "1.15.0"
},
{
"status": "affected",
"version": "1.17.0"
},
{
"status": "affected",
"version": "1.17.1"
},
{
"status": "affected",
"version": "1.17.2"
},
{
"status": "affected",
"version": "1.19.0"
},
{
"status": "affected",
"version": "1.20.1"
},
{
"status": "affected",
"version": "1.20.2"
},
{
"status": "affected",
"version": "1.20.3"
},
{
"status": "affected",
"version": "1.20.4"
},
{
"status": "affected",
"version": "1.20.5"
},
{
"status": "affected",
"version": "1.20.6"
},
{
"status": "affected",
"version": "1.23.0"
},
{
"status": "affected",
"version": "1.23.1"
},
{
"status": "affected",
"version": "1.20.7"
},
{
"status": "affected",
"version": "1.20.8"
},
{
"status": "affected",
"version": "1.25.0"
},
{
"status": "affected",
"version": "1.25.1"
},
{
"status": "affected",
"version": "1.25.2"
},
{
"status": "affected",
"version": "1.27.1"
},
{
"status": "affected",
"version": "1.27.2"
},
{
"status": "affected",
"version": "7.3.13"
},
{
"status": "affected",
"version": "7.3.15"
},
{
"status": "affected",
"version": "7.4.1"
},
{
"status": "affected",
"version": "7.4.1.20425"
},
{
"status": "affected",
"version": "7.4.1.20439"
},
{
"status": "affected",
"version": "7.4.3"
},
{
"status": "affected",
"version": "7.4.3.20679"
},
{
"status": "affected",
"version": "7.4.5"
},
{
"status": "affected",
"version": "7.5.1.20813"
},
{
"status": "affected",
"version": "7.5.1.20833"
},
{
"status": "affected",
"version": "7.5.3"
},
{
"status": "affected",
"version": "7.5.5"
},
{
"status": "affected",
"version": "8.0.1.21160"
},
{
"status": "affected",
"version": "8.0.1.21164"
},
{
"status": "affected",
"version": "7.5.7"
},
{
"status": "affected",
"version": "7.5.9"
},
{
"status": "affected",
"version": "7.5.11"
},
{
"status": "affected",
"version": "8.1.7.21585"
},
{
"status": "affected",
"version": "7.5.13.21586"
},
{
"status": "affected",
"version": "7.5.13.21598"
},
{
"status": "affected",
"version": "8.2.1.21612"
},
{
"status": "affected",
"version": "8.2.1.21650"
},
{
"status": "affected",
"version": "7.5.15.21611"
},
{
"status": "affected",
"version": "7.5.17.21680"
},
{
"status": "affected",
"version": "8.2.3.30119"
},
{
"status": "affected",
"version": "8.2.4.30130"
},
{
"status": "affected",
"version": "8.4.0"
},
{
"status": "affected",
"version": "7.5.19"
},
{
"status": "affected",
"version": "8.4.1.30298"
},
{
"status": "affected",
"version": "8.4.2.30317"
},
{
"status": "affected",
"version": "8.4.1.30307"
},
{
"status": "affected",
"version": "7.5.20"
},
{
"status": "affected",
"version": "8.4.3"
},
{
"status": "affected",
"version": "8.4.4.30419"
},
{
"status": "affected",
"version": "8.4.4.30467"
},
{
"status": "affected",
"version": "7.5.21.21732"
},
{
"status": "affected",
"version": "8.4.5.30483"
}
],
"defaultStatus": "unknown"
}
]
}
],
"published": "2026-08-07T17:17:02.807",
"references": [
{
"url": "https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-clamav-WuuvVd26",
"source": "psirt@cisco.com"
}
],
"vulnStatus": "Awaiting Analysis",
"weaknesses": [
{
"type": "Secondary",
"source": "psirt@cisco.com",
"description": [
{
"lang": "en",
"value": "CWE-190"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "A vulnerability in the PESpin file format parser of ClamAV could allow an unauthenticated, remote attacker to cause a DoS condition or possibly other expanded impacts as a result of memory corruption on an affected device.\r\n\r\nThis vulnerability is due to improper boundary checks for content in PESpin files during scanning, which may result in an integer overflow. An attacker could exploit this vulnerability by submitting a crafted file that contains PESpin content to be scanned by ClamAV on an affected device. A successful exploit could allow the attacker to cause the ClamAV scanning process to terminate, resulting in a DoS condition on the affected software."
}
],
"lastModified": "2026-08-11T18:54:19.877",
"sourceIdentifier": "psirt@cisco.com"
}