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CVE-2026-39459: RCE in F5 BIG-IP via iControl REST
Plataforma
linux
Componente
bigip
Corregido en
21.0.0.2
CVE-2026-39459 is a Remote Code Execution (RCE) vulnerability affecting F5 BIG-IP versions 16.1.0 through 21.0.0.2. A highly privileged, authenticated attacker with the Manager role can leverage this flaw to create configuration objects that allow the execution of arbitrary commands on the system. This vulnerability is rated HIGH severity (CVSS 7.2) and requires immediate attention to prevent potential compromise.
Impacto y Escenarios de Ataquetraduciendo…
Successful exploitation of CVE-2026-39459 allows an attacker to gain complete control over the affected BIG-IP system. This includes the ability to execute arbitrary commands with the privileges of the Manager role, potentially leading to data exfiltration, system modification, and denial of service. The attacker could install malware, pivot to other systems on the network, or disrupt critical services. The blast radius extends to any system accessible from the compromised BIG-IP, making it a significant security risk. This vulnerability shares similarities with other iControl REST vulnerabilities, highlighting the importance of secure configuration and access controls.
Contexto de Explotacióntraduciendo…
CVE-2026-39459 was published on May 13, 2026. Its severity is pending evaluation for inclusion on the CISA Known Exploited Vulnerabilities (KEV) catalog. Public proof-of-concept (POC) code is currently unavailable, but the vulnerability's nature suggests a high likelihood of exploitation once available. Monitor security advisories and threat intelligence feeds for any indications of active exploitation campaigns.
Inteligencia de Amenazas
Estado del Exploit
CISA SSVC
Vector CVSS
¿Qué significan estas métricas?
- Attack Vector
- Red — explotable remotamente por internet. Sin acceso físico ni local. Mayor superficie de ataque.
- Attack Complexity
- Baja — sin condiciones especiales. El atacante puede explotar de forma confiable sin configuraciones raras.
- Privileges Required
- Alto — se requiere cuenta de administrador o privilegiada.
- User Interaction
- Ninguna — el ataque es automático y silencioso. La víctima no hace nada.
- Scope
- Sin cambio — el impacto se limita al componente vulnerable.
- Confidentiality
- Alto — pérdida total de confidencialidad. El atacante puede leer todos los datos.
- Integrity
- Alto — el atacante puede escribir, modificar o eliminar cualquier dato.
- Availability
- Alto — caída completa o agotamiento de recursos. Denegación de servicio total.
Software Afectado
Clasificación de Debilidad (CWE)
Cronología
- Reservado
- Publicada
- Modificada
Mitigación y Workaroundstraduciendo…
The primary mitigation for CVE-2026-39459 is to upgrade to F5 BIG-IP version 21.0.0.2 or later, which contains the fix. If immediate upgrade is not possible, consider implementing temporary workarounds such as restricting access to the iControl REST interface to trusted sources only. Implement strict authentication and authorization policies, ensuring that only authorized users with the minimum necessary privileges can access the system. Review and audit existing iControl REST configurations to identify and remove any potentially malicious objects. After upgrading, verify the fix by attempting to create a configuration object that executes a command and confirming that the attempt is denied.
Cómo corregirlotraduciendo…
Actualice a una versión corregida de F5 BIG-IP. Las versiones corregidas son 21.0.0.2, 17.5.1.6 y 17.1.3.2. Consulte la nota de seguridad de F5 para obtener más detalles y pasos de mitigación.
Preguntas frecuentestraduciendo…
What is CVE-2026-39459 — RCE in F5 BIG-IP?
CVE-2026-39459 is a Remote Code Execution vulnerability in F5 BIG-IP versions 16.1.0–21.0.0.2. An authenticated attacker can execute arbitrary commands, potentially gaining full control of the system.
Am I affected by CVE-2026-39459 in F5 BIG-IP?
You are affected if you are running F5 BIG-IP versions 16.1.0 through 21.0.0.2 and have not upgraded to a patched version. Check your BIG-IP version immediately.
How do I fix CVE-2026-39459 in F5 BIG-IP?
Upgrade to F5 BIG-IP version 21.0.0.2 or later. As a temporary workaround, restrict access to the iControl REST interface and enforce strict authentication policies.
Is CVE-2026-39459 being actively exploited?
While no public exploits are currently available, the vulnerability's nature suggests a high likelihood of exploitation. Monitor security advisories and threat intelligence feeds.
Where can I find the official F5 advisory for CVE-2026-39459?
Refer to the official F5 Security Advisory for CVE-2026-39459 on the F5 website: [https://www.f5.com/security/center/advisory/f5-security-advisory-39459](https://www.f5.com/security/center/advisory/f5-security-advisory-39459)
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