CVE-2025-20133 — Missing Release of Memory after Effective Lifetime in Cisco Adaptive Security Appliance Software

CWE-401 — Missing Release of Memory after Effective Lifetime CWE-835 — Infinite Loop4 documents4 sources

Severity

8.6HIGHNVD

EPSS

0.1%

top 77.94%

CISA KEV

Not in KEV

Exploit

No known exploits

Affected products

Cisco Adaptive Security Appliance Software Cisco Firepower Threat Defense Software

Timeline

PublishedAug 14

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 VP…

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:HExploitability: 3.9 | Impact: 4.0

Affected Packages2 packages

▶CVEListV5cisco/cisco_firepower_threat_defense_software87 versions+86

▶CVEListV5cisco/cisco_adaptive_security_appliance_software189 versions+188

🔴Vulnerability Details

CVEList

Cisco Secure Firewall Adaptive Security Appliance and Secure Firewall Threat Defense Software Remote Access SSL VPN Authentication Targeted Denial of Service Vulnerability↗2025-08-14

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GHSA

GHSA-5hvh-v86p-hc95: 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 Softwa↗2025-08-14

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📋Vendor Advisories

Cisco

Cisco Secure Firewall Adaptive Security Appliance and Secure Firewall Threat Defense Software Remote Access SSL VPN Denial of Service Vulnerabilities↗2025-08-14

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