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CVE-2025-20133 Details

ANALYZED

This CVE record has been analyzed and enriched by NVDAPI.com as an independent party.

Description

A vulnerability in the management and VPN web servers of the Remote Access SSL VPN feature of Cisco Secure Firewall ASA Software and Secure FTD Software could allow an unauthenticated, remote attacker to cause the device to unexpectedly stop responding, resulting in a DoS condition. This vulnerability is due to ineffective validation of user-supplied input during the Remote Access SSL VPN authentication process. An attacker could exploit this vulnerability by sending a crafted request to the VPN service on an affected device. A successful exploit could allow the attacker to cause a DoS condition where the device stops responding to Remote Access SSL VPN authentication requests.

Metrics

CVSS 3.x Severity and Vector Strings:

VolerionCVSS-B:7.5 HIGHVector:CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CNA: [email protected]CVSS-B:8.6 HIGHVector:CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H

References to Advisories, Solutions, and Tools

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URL	Source(s)	Tag(s)
https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asaftd-vpn-dos-mfPekA6e	[email protected]	AdvisoryBundleRemedyVendor

Weakness Enumeration

CWE-ID	CWE Name	Source
CWE-401	Missing Release of Memory after Effective Lifetime	[email protected]

Affected Products

Product	Versions
Cisco Secure Firewall ASA	All versions
CPE cpe:2.3:a:cisco:adaptive_security_appliance:::::::: cpe:2.3:h:cisco:adaptive_security_appliance:::::::: cpe:2.3:a:cisco:adaptive_security_appliance_software:::::::: Remediation No remediation found in references.
Cisco Secure Firewall Threat Defense	All versions
CPE cpe:2.3:o:cisco:firepower_threat_defense:::::::: cpe:2.3:a:cisco:firepower_threat_defense_software:::::::: cpe:2.3:a:cisco:firepower_threat_defense:::::::: cpe:2.3:a:cisco:firepower_threat_defense_virtual:::::::: Remediation No remediation found in references.

Change History

3 change records found show changes

Date	Action	Recorded By
Jun 17, 2026	CVE Modified	[email protected]
Jun 17, 2026	CVE Modified	CISA-ADP
Aug 14, 2025	New CVE Received	[email protected]