CVE-2026-20106

  1. OpenCVE
  2. Vulnerabilities (CVE)
  3. CVE-2026-20106
A vulnerability in the Remote Access SSL VPN, HTTP management and MUS functionality, of Cisco Secure Firewall Adaptive Security Appliance (ASA) Software and Secure Firewall Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to exhaust device memory resulting in a denial of service (DoS) condition requiring a manual reboot. This vulnerability is due to trusting user input without validation. An attacker could exploit this vulnerability by sending crafted packets to the Remote Access SSL VPN server. A successful exploit could allow the attacker to cause the device to stop responding, resulting in a DoS condition.

5.3 /10

CVSS v3 : MEDIUM

V3 Legend

Vector :

Exploitability : 3.9 / Impact : 1.4

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact LOW

Scope UNCHANGED

References
Link Resource
https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asaftd-vpn-m9sx6MbC Vendor Advisory
Configurations

Configuration 1 (hide)

OR cpe:2.3:o:cisco:adaptive_security_appliance_software:*:*:*:*:*:*:*:*
cpe:2.3:o:cisco:adaptive_security_appliance_software:*:*:*:*:*:*:*:*
cpe:2.3:o:cisco:adaptive_security_appliance_software:*:*:*:*:*:*:*:*
cpe:2.3:o:cisco:adaptive_security_appliance_software:*:*:*:*:*:*:*:*
cpe:2.3:o:cisco:adaptive_security_appliance_software:*:*:*:*:*:*:*:*

Configuration 2 (hide)

OR cpe:2.3:a:cisco:firepower_threat_defense_software:*:*:*:*:*:*:*:*
cpe:2.3:a:cisco:firepower_threat_defense_software:*:*:*:*:*:*:*:*
cpe:2.3:a:cisco:firepower_threat_defense_software:*:*:*:*:*:*:*:*
cpe:2.3:a:cisco:firepower_threat_defense_software:*:*:*:*:*:*:*:*
cpe:2.3:a:cisco:firepower_threat_defense_software:*:*:*:*:*:*:*:*
History

16 Apr 2026, 20:27

Type Values Removed Values Added
CPE cpe:2.3:a:cisco:firepower_threat_defense_software:*:*:*:*:*:*:*:*
cpe:2.3:o:cisco:adaptive_security_appliance_software:*:*:*:*:*:*:*:*
First Time Cisco firepower Threat Defense Software
Cisco
Cisco adaptive Security Appliance Software
Summary
  • (es) Una vulnerabilidad en la funcionalidad de VPN SSL de acceso remoto, gestión HTTP y MUS, de Cisco Secure Firewall Adaptive Security Appliance (ASA) Software y Secure Firewall Threat Defense (FTD) Software podría permitir a un atacante remoto no autenticado agotar la memoria del dispositivo, lo que resultaría en una condición de denegación de servicio (DoS) que requiere un reinicio manual. Esta vulnerabilidad se debe a la confianza en la entrada del usuario sin validación. Un atacante podría explotar esta vulnerabilidad enviando paquetes manipulados al servidor VPN SSL de acceso remoto. Un exploit exitoso podría permitir al atacante hacer que el dispositivo deje de responder, lo que resultaría en una condición de DoS.
References () https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asaftd-vpn-m9sx6MbC - () https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asaftd-vpn-m9sx6MbC - Vendor Advisory

04 Mar 2026, 18:16

Type Values Removed Values Added
New CVE
Information

Published : 2026-03-04 18:16

Updated : 2026-04-16 20:27

NVD link : CVE-2026-20106

Mitre link : CVE-2026-20106

CVE.ORG link : CVE-2026-20106

JSON object : View

Products Affected

cisco

  • firepower_threat_defense_software
  • adaptive_security_appliance_software
CWE
CWE-401

Missing Release of Memory after Effective Lifetime