CVE-2025-20251 Information
Description
A vulnerability in the Remote Access SSL VPN service for Cisco Secure Firewall Adaptive Security Appliance (ASA) Software and Cisco Secure Firewall Threat Defense (FTD) Software could allow an authenticated remote attacker to create or delete arbitrary files on the underlying operating system. If critical system files are manipulated new Remote Access SSL VPN sessions could be denied and existing sessions could be dropped causing a denial of service (DoS) condition. An exploited device requires a manual reboot to recover.
This vulnerability is due to insufficient input validation when processing HTTP requests. An attacker could exploit this vulnerability by sending crafted HTTP requests to an affected device. A successful exploit could allow the attacker to create or delete files on the underlying operating system which could cause the Remote Access SSL VPN service to become unresponsive. To exploit this vulnerability the attacker must be authenticated as a VPN user of the affected device.
CVSS Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:L/A:H
Reference
Attack Complexity
LOW
Privileges Required
LOW
User Interaction Required
LOW
Scope
NONE
Confidentiality Impact
CHANGED
Integrity Impact
NONE
Availability Impact
LOW
Base Score
HIGH
Base Severity
8.5
Related CNNVD
CNNVD-202508-1700 (Published: 2025-08-14)
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