CVE-2026-20079

  1. OpenCVE
  2. Vulnerabilities (CVE)
  3. CVE-2026-20079
A vulnerability in the web interface of Cisco Secure Firewall Management Center (FMC) Software could allow an unauthenticated, remote attacker to bypass authentication and execute script files on an affected device to obtain root access to the underlying operating system.  This vulnerability is due to an improper system process that is created at boot time. An attacker could exploit this vulnerability by sending crafted HTTP requests to an affected device. A successful exploit could allow the attacker to execute a variety of scripts and commands that allow root access to the device. 

10.0 /10

CVSS v3 : CRITICAL

V3 Legend

Vector :

Exploitability : 3.9 / Impact : 6.0

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact HIGH

Scope CHANGED

References
Link Resource
https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-onprem-fmc-authbypass-5JPp45V2
Configurations

No configuration.

History

29 Jul 2026, 17:16

Type Values Removed Values Added
Summary (en) A vulnerability in the web interface of Cisco Secure Firewall Management Center (FMC) Software could allow an unauthenticated, remote attacker to bypass authentication and execute script files on an affected device to obtain root access to the underlying operating system. This vulnerability is due to an improper system process that is created at boot time. An attacker could exploit this vulnerability by sending crafted HTTP requests to an affected device. A successful exploit could allow the attacker to execute a variety of scripts and commands that allow root access to the device. (en) A vulnerability in the web interface of Cisco Secure Firewall Management Center (FMC) Software could allow an unauthenticated, remote attacker to bypass authentication and execute script files on an affected device to obtain root access to the underlying operating system.  This vulnerability is due to an improper system process that is created at boot time. An attacker could exploit this vulnerability by sending crafted HTTP requests to an affected device. A successful exploit could allow the attacker to execute a variety of scripts and commands that allow root access to the device. 

17 Jun 2026, 10:17

Type Values Removed Values Added
Summary
  • (es) Una vulnerabilidad en la interfaz web de Cisco Secure Firewall Management Center (FMC) Software podría permitir a un atacante remoto no autenticado eludir la autenticación y ejecutar archivos de script en un dispositivo afectado para obtener acceso de root al sistema operativo subyacente. Esta vulnerabilidad se debe a un proceso de sistema inadecuado que se crea al iniciar. Un atacante podría explotar esta vulnerabilidad enviando solicitudes HTTP manipuladas a un dispositivo afectado. Un exploit exitoso podría permitir al atacante ejecutar una variedad de scripts y comandos que permiten acceso de root al dispositivo.

04 Mar 2026, 18:16

Type Values Removed Values Added
New CVE
Information

Published : 2026-03-04 18:16

Updated : 2026-07-29 17:16

NVD link : CVE-2026-20079

Mitre link : CVE-2026-20079

CVE.ORG link : CVE-2026-20079

JSON object : View

Products Affected

No product.

CWE
CWE-288

Authentication Bypass Using an Alternate Path or Channel