CVE-2026-33984
Estado: ModificadaAlta (7.5)—
FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to version 3.24.2, in resize_vbar_entry() in libfreerdp/codec/clear.c, vBarEntry->size is updated to vBarEntry->count before the winpr_aligned_recalloc() call. If realloc fails, size is inflated while pixels still points to the old, smaller buffer. On a subsequent call where count <= size (the inflated value), realloc is skipped. The caller then writes count * bpp bytes of attacker-controlled pixel data into the undersized buffer, causing a heap buffer overflow. This issue has been patched in version 3.24.2.
CVSS
- Versión: 3.1
- Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
- Puntuación base: 7.5
Probabilidad de explotación (EPSS)
- Probabilidad de explotación en los próximos 30 días: 0.68%
- Percentil entre todas las CVEs puntuadas: 51
- 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
T1203Exploitation for Client Executionexecution85 % - Impacto principal
T1059Command and Scripting Interpreterexecution75 %
RDP interactivo requiere UI:R; heap overflow en procesamiento de datos remotos permite ejecución de código arbitrario.
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)
CWE
- CWE-122, CWE-131
- CWE-131
Referencias
- https://github.com/FreeRDP/FreeRDP/commit/dc7fdb165095139be779a4000199bc1706b06ad5
- https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-8469-2xcx-frf6
- https://access.redhat.com/errata/RHSA-2026:10709
- https://access.redhat.com/errata/RHSA-2026:11332
- https://access.redhat.com/errata/RHSA-2026:11333
- https://access.redhat.com/errata/RHSA-2026:11336
- https://access.redhat.com/errata/RHSA-2026:11649
- https://access.redhat.com/errata/RHSA-2026:11651
- https://access.redhat.com/errata/RHSA-2026:12359
- https://access.redhat.com/errata/RHSA-2026:12388
- https://access.redhat.com/errata/RHSA-2026:19033
- https://access.redhat.com/errata/RHSA-2026:19349
- https://access.redhat.com/errata/RHSA-2026:8457
- https://access.redhat.com/errata/RHSA-2026:8458
- https://access.redhat.com/errata/RHSA-2026:8945
- https://access.redhat.com/errata/RHSA-2026:9656
- https://access.redhat.com/security/cve/CVE-2026-33984
- https://bugzilla.redhat.com/show_bug.cgi?id=2453219
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-33984.json
JSON original (NVD)
Mostrar
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