8.6

CVE-2026-20039

Warnung

Cisco Adaptive Security Appliance and Firepower Threat Defense Software SSL VPN Authentication Denial of Service Vulnerability

A vulnerability in the VPN web server of Cisco Secure Firewall Adaptive Security Appliance (ASA) Software and Cisco Secure Firewall Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device.

This vulnerability is due to ineffective memory management of the VPN web server. An attacker could exploit this vulnerability by sending a large number of crafted HTTP requests to an affected device. A successful exploit could allow the attacker to cause the device to reload, resulting in a DoS condition.
Daten sind bereitgestellt durch National Vulnerability Database (NVD)
Cisco ≫ Adaptive Security Appliance Software Version >= 9.12.1 < 9.16.4.84
Cisco ≫ Adaptive Security Appliance Software Version >= 9.17.1 < 9.18.4.57
Cisco ≫ Adaptive Security Appliance Software Version >= 9.19.1 < 9.20.3.16
Cisco ≫ Adaptive Security Appliance Software Version >= 9.22.1.1 < 9.22.2.4
Cisco ≫ Adaptive Security Appliance Software Version >= 9.23.1 < 9.23.1.3
Cisco ≫ Firepower Threat Defense Software Version >= 6.4.0 < 7.0.9
Cisco ≫ Firepower Threat Defense Software Version >= 7.1.0 < 7.2.10
Cisco ≫ Firepower Threat Defense Software Version >= 7.3.0 < 7.4.3
Cisco ≫ Firepower Threat Defense Software Version >= 7.6.0 < 7.6.1
Cisco ≫ Firepower Threat Defense Software Version >= 7.7.0 < 7.7.10
VulnDex Vulnerability Enrichment
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EPSS Metriken
Typ Quelle Score Percentile
EPSS FIRST.org 0.09% 0.251
CVSS Metriken
Quelle Base Score Exploit Score Impact Score Vector String
psirt@cisco.com 8.6 3.9 4
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
CWE-244 Improper Clearing of Heap Memory Before Release ('Heap Inspection')

Using realloc() to resize buffers that store sensitive information can leave the sensitive information exposed to attack, because it is not removed from memory.