CVE-2021-4204
Estado: ModificadaAlta (7.1)—💥 PoC
An out-of-bounds (OOB) memory access flaw was found in the Linux kernel's eBPF due to an Improper Input Validation. This flaw allows a local attacker with a special privilege to crash the system or leak internal information.
CVSS
- Versión: 3.1
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
- Puntuación base: 7.1
Probabilidad de explotación (EPSS)
- Probabilidad de explotación en los próximos 30 días: 1.22%
- Percentil entre todas las CVEs puntuadas: 68
- 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).
💥 Exploits públicos
Hay código de explotación o plantillas de detección públicos. No es lo mismo que explotación activa confirmada (KEV), pero aumenta el riesgo: parchee con prioridad.
- Prueba de concepto en GitHub (no verificada) · Lista de pruebas de concepto en GitHub
⚠️ Las pruebas de concepto de GitHub no están verificadas: algunas son falsas o contienen malware. No las ejecute nunca fuera de un laboratorio aislado.
Tecnologías afectadas (8)
CWE
- CWE-20
- CWE-119
Referencias
- https://access.redhat.com/security/cve/CVE-2021-4204
- https://bugzilla.redhat.com/show_bug.cgi?id=2039178
- https://security-tracker.debian.org/tracker/CVE-2021-4204
- https://security.netapp.com/advisory/ntap-20221228-0003/
- https://www.openwall.com/lists/oss-security/2022/01/11/4
- https://access.redhat.com/security/cve/CVE-2021-4204
- https://bugzilla.redhat.com/show_bug.cgi?id=2039178
- https://security-tracker.debian.org/tracker/CVE-2021-4204
- https://security.netapp.com/advisory/ntap-20221228-0003/
- https://www.openwall.com/lists/oss-security/2022/01/11/4
JSON original (NVD)
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