CVE-2025-20243

HIGH EPSS 41.6%

Published Aug 14, 202510mo ago · Modified Jun 17, 20261w ago

8.6 CVSS 3.1

High

Published Aug 14, 2025 10mo ago

Last Modified Jun 17, 2026 1w ago

Description

A vulnerability in the management and VPN web servers of Cisco Secure Firewall ASA Software and Secure FTD Software could allow an unauthenticated, remote attacker to cause the device to reload unexpectedly, resulting in a DoS condition. This vulnerability is due to improper validation of user-supplied input on an interface with VPN web services. An attacker could exploit this vulnerability by sending crafted HTTP requests to a targeted web server on an affected device. A successful exploit could allow the attacker to cause a DoS condition when the device reloads.

CVSS Details

Base Score

8.6

Exploitability

3.9

Impact

4.0

Vector string

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H

Attack Vector Network

Attack Complexity Low

Privileges Required None

User Interaction None

Scope Changed

Confidentiality None

Integrity None

Availability High

Threat Intelligence

EPSS Exploit Probability

41.6% percentile

Exploit & Patch Status

No Known Exploit

No Patch Available

Weaknesses 1

CWE-835

References 1

sec.cloudapps.cisco.com https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asaftd-vpn-dos-mfPekA6e

Remediation

No remediation data recorded yet

Check vendor advisories and the NVD entry for patch availability.