CVE-2026-20349

Published: Aug 11, 2026Modified: Aug 12, 2026CISA KEV

8.6

Vector

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

Exploitability: 3.9 / Impact: 4.0

Source: psirt@cisco.com (Secondary)

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 unauthenticated, remote attacker to cause the device to reload unexpectedly, resulting in a denial of service (DoS) condition.  This vulnerability is due to insufficient error checking when processing HTTP requests. An attacker could exploit this vulnerability by sending a crafted HTTP request to the Remote Access SSL VPN service on an affected device. A successful exploit could allow the attacker to cause the affected device to reload, resulting in a DoS condition.

Affected (197)

Products: Cisco: Adaptive Security Appliance Software, Secure Firewall Threat Defense

Cisco

2 products

Adaptive Security Appliance Software

Secure Firewall Threat Defense

Configuration A

133 vulnerable

Vulnerable Software	Affected Versions
Cisco Adaptive Security Appliance Software	Version 9.16.1.28
Cisco Adaptive Security Appliance Software	Version 9.16.1
Cisco Adaptive Security Appliance Software	Version 9.16.2.11
Cisco Adaptive Security Appliance Software	Version 9.16.2.13
Cisco Adaptive Security Appliance Software	Version 9.16.2.14
Cisco Adaptive Security Appliance Software	Version 9.16.2.3
Cisco Adaptive Security Appliance Software	Version 9.16.2.7
Cisco Adaptive Security Appliance Software	Version 9.16.2
Cisco Adaptive Security Appliance Software	Version 9.16.3.14
Cisco Adaptive Security Appliance Software	Version 9.16.3.15
Cisco Adaptive Security Appliance Software	Version 9.16.3.19
Cisco Adaptive Security Appliance Software	Version 9.16.3.23
Cisco Adaptive Security Appliance Software	Version 9.16.3.3
Cisco Adaptive Security Appliance Software	Version 9.16.3
Cisco Adaptive Security Appliance Software	Version 9.16.4.14
Cisco Adaptive Security Appliance Software	Version 9.16.4.19
Cisco Adaptive Security Appliance Software	Version 9.16.4.27
Cisco Adaptive Security Appliance Software	Version 9.16.4.38
Cisco Adaptive Security Appliance Software	Version 9.16.4.39
Cisco Adaptive Security Appliance Software	Version 9.16.4.42
Cisco Adaptive Security Appliance Software	Version 9.16.4.48
Cisco Adaptive Security Appliance Software	Version 9.16.4.55
Cisco Adaptive Security Appliance Software	Version 9.16.4.57
Cisco Adaptive Security Appliance Software	Version 9.16.4.61
Cisco Adaptive Security Appliance Software	Version 9.16.4.62
Cisco Adaptive Security Appliance Software	Version 9.16.4.67
Cisco Adaptive Security Appliance Software	Version 9.16.4.70
Cisco Adaptive Security Appliance Software	Version 9.16.4.71
Cisco Adaptive Security Appliance Software	Version 9.16.4.76
Cisco Adaptive Security Appliance Software	Version 9.16.4.82
Cisco Adaptive Security Appliance Software	Version 9.16.4.84
Cisco Adaptive Security Appliance Software	Version 9.16.4.85
Cisco Adaptive Security Appliance Software	Version 9.16.4.89
Cisco Adaptive Security Appliance Software	Version 9.16.4.92
Cisco Adaptive Security Appliance Software	Version 9.16.4.9
Cisco Adaptive Security Appliance Software	Version 9.16.4
Cisco Adaptive Security Appliance Software	Version 9.18.1.3
Cisco Adaptive Security Appliance Software	Version 9.18.1
Cisco Adaptive Security Appliance Software	Version 9.18.2.5
Cisco Adaptive Security Appliance Software	Version 9.18.2.7
Cisco Adaptive Security Appliance Software	Version 9.18.2.8
Cisco Adaptive Security Appliance Software	Version 9.18.2
Cisco Adaptive Security Appliance Software	Version 9.18.3.39
Cisco Adaptive Security Appliance Software	Version 9.18.3.46
Cisco Adaptive Security Appliance Software	Version 9.18.3.53
Cisco Adaptive Security Appliance Software	Version 9.18.3.55
Cisco Adaptive Security Appliance Software	Version 9.18.3.56
Cisco Adaptive Security Appliance Software	Version 9.18.3
Cisco Adaptive Security Appliance Software	Version 9.18.4.135
Cisco Adaptive Security Appliance Software	Version 9.18.4.22
Cisco Adaptive Security Appliance Software	Version 9.18.4.24
Cisco Adaptive Security Appliance Software	Version 9.18.4.29
Cisco Adaptive Security Appliance Software	Version 9.18.4.34
Cisco Adaptive Security Appliance Software	Version 9.18.4.40
Cisco Adaptive Security Appliance Software	Version 9.18.4.47
Cisco Adaptive Security Appliance Software	Version 9.18.4.50
Cisco Adaptive Security Appliance Software	Version 9.18.4.52
Cisco Adaptive Security Appliance Software	Version 9.18.4.53
Cisco Adaptive Security Appliance Software	Version 9.18.4.57
Cisco Adaptive Security Appliance Software	Version 9.18.4.5
Cisco Adaptive Security Appliance Software	Version 9.18.4.66
Cisco Adaptive Security Appliance Software	Version 9.18.4.67
Cisco Adaptive Security Appliance Software	Version 9.18.4.68
Cisco Adaptive Security Appliance Software	Version 9.18.4.71
Cisco Adaptive Security Appliance Software	Version 9.18.4.76
Cisco Adaptive Security Appliance Software	Version 9.18.4.82
Cisco Adaptive Security Appliance Software	Version 9.18.4.8
Cisco Adaptive Security Appliance Software	Version 9.18.4.90
Cisco Adaptive Security Appliance Software	Version 9.18.4
Cisco Adaptive Security Appliance Software	Version 9.19.1.12
Cisco Adaptive Security Appliance Software	Version 9.19.1.18
Cisco Adaptive Security Appliance Software	Version 9.19.1.22
Cisco Adaptive Security Appliance Software	Version 9.19.1.24
Cisco Adaptive Security Appliance Software	Version 9.19.1.27
Cisco Adaptive Security Appliance Software	Version 9.19.1.28
Cisco Adaptive Security Appliance Software	Version 9.19.1.31
Cisco Adaptive Security Appliance Software	Version 9.19.1.37
Cisco Adaptive Security Appliance Software	Version 9.19.1.38
Cisco Adaptive Security Appliance Software	Version 9.19.1.42
Cisco Adaptive Security Appliance Software	Version 9.19.1.5
Cisco Adaptive Security Appliance Software	Version 9.19.1.9
Cisco Adaptive Security Appliance Software	Version 9.19.1
Cisco Adaptive Security Appliance Software	Version 9.20.1.5
Cisco Adaptive Security Appliance Software	Version 9.20.1
Cisco Adaptive Security Appliance Software	Version 9.20.2.10
Cisco Adaptive Security Appliance Software	Version 9.20.2.21
Cisco Adaptive Security Appliance Software	Version 9.20.2.22
Cisco Adaptive Security Appliance Software	Version 9.20.2
Cisco Adaptive Security Appliance Software	Version 9.20.3.10
Cisco Adaptive Security Appliance Software	Version 9.20.3.13
Cisco Adaptive Security Appliance Software	Version 9.20.3.16
Cisco Adaptive Security Appliance Software	Version 9.20.3.20
Cisco Adaptive Security Appliance Software	Version 9.20.3.4
Cisco Adaptive Security Appliance Software	Version 9.20.3.7
Cisco Adaptive Security Appliance Software	Version 9.20.3.9
Cisco Adaptive Security Appliance Software	Version 9.20.3
Cisco Adaptive Security Appliance Software	Version 9.20.4.10
Cisco Adaptive Security Appliance Software	Version 9.20.4.14
Cisco Adaptive Security Appliance Software	Version 9.20.4.19
Cisco Adaptive Security Appliance Software	Version 9.20.4.22
Cisco Adaptive Security Appliance Software	Version 9.20.4.28
Cisco Adaptive Security Appliance Software	Version 9.20.4.30
Cisco Adaptive Security Appliance Software	Version 9.20.4.34
Cisco Adaptive Security Appliance Software	Version 9.20.4.46
Cisco Adaptive Security Appliance Software	Version 9.20.4.7
Cisco Adaptive Security Appliance Software	Version 9.20.4
Cisco Adaptive Security Appliance Software	Version 9.22.1.1
Cisco Adaptive Security Appliance Software	Version 9.22.1.2
Cisco Adaptive Security Appliance Software	Version 9.22.1.3
Cisco Adaptive Security Appliance Software	Version 9.22.1.6
Cisco Adaptive Security Appliance Software	Version 9.22.2.13
Cisco Adaptive Security Appliance Software	Version 9.22.2.14
Cisco Adaptive Security Appliance Software	Version 9.22.2.20
Cisco Adaptive Security Appliance Software	Version 9.22.2.32
Cisco Adaptive Security Appliance Software	Version 9.22.2.4
Cisco Adaptive Security Appliance Software	Version 9.22.2.9
Cisco Adaptive Security Appliance Software	Version 9.22.2
Cisco Adaptive Security Appliance Software	Version 9.22.3.5
Cisco Adaptive Security Appliance Software	Version 9.22.3
Cisco Adaptive Security Appliance Software	Version 9.23.1.13
Cisco Adaptive Security Appliance Software	Version 9.23.1.195
Cisco Adaptive Security Appliance Software	Version 9.23.1.19
Cisco Adaptive Security Appliance Software	Version 9.23.1.22
Cisco Adaptive Security Appliance Software	Version 9.23.1.26
Cisco Adaptive Security Appliance Software	Version 9.23.1.32
Cisco Adaptive Security Appliance Software	Version 9.23.1.3
Cisco Adaptive Security Appliance Software	Version 9.23.1.7
Cisco Adaptive Security Appliance Software	Version 9.23.1
Cisco Adaptive Security Appliance Software	Version 9.24.1.11
Cisco Adaptive Security Appliance Software	Version 9.24.1.155
Cisco Adaptive Security Appliance Software	Version 9.24.1.5
Cisco Adaptive Security Appliance Software	Version 9.24.1.9
Cisco Adaptive Security Appliance Software	Version 9.24.1

Configuration B

64 vulnerable

Vulnerable Software	Affected Versions
Cisco Secure Firewall Threat Defense	Version 10.0.0
Cisco Secure Firewall Threat Defense	Version 10.0.2
Cisco Secure Firewall Threat Defense	Version 7.0.0.1
Cisco Secure Firewall Threat Defense	Version 7.0.0
Cisco Secure Firewall Threat Defense	Version 7.0.1.1
Cisco Secure Firewall Threat Defense	Version 7.0.1
Cisco Secure Firewall Threat Defense	Version 7.0.2.1
Cisco Secure Firewall Threat Defense	Version 7.0.2
Cisco Secure Firewall Threat Defense	Version 7.0.3
Cisco Secure Firewall Threat Defense	Version 7.0.4
Cisco Secure Firewall Threat Defense	Version 7.0.5
Cisco Secure Firewall Threat Defense	Version 7.0.6.1
Cisco Secure Firewall Threat Defense	Version 7.0.6.2
Cisco Secure Firewall Threat Defense	Version 7.0.6.3
Cisco Secure Firewall Threat Defense	Version 7.0.6
Cisco Secure Firewall Threat Defense	Version 7.0.7
Cisco Secure Firewall Threat Defense	Version 7.0.8.1
Cisco Secure Firewall Threat Defense	Version 7.0.8
Cisco Secure Firewall Threat Defense	Version 7.0.9
Cisco Secure Firewall Threat Defense	Version 7.2.0.1
Cisco Secure Firewall Threat Defense	Version 7.2.0
Cisco Secure Firewall Threat Defense	Version 7.2.10.2
Cisco Secure Firewall Threat Defense	Version 7.2.10
Cisco Secure Firewall Threat Defense	Version 7.2.11
Cisco Secure Firewall Threat Defense	Version 7.2.12
Cisco Secure Firewall Threat Defense	Version 7.2.1
Cisco Secure Firewall Threat Defense	Version 7.2.2
Cisco Secure Firewall Threat Defense	Version 7.2.3
Cisco Secure Firewall Threat Defense	Version 7.2.4.1
Cisco Secure Firewall Threat Defense	Version 7.2.4
Cisco Secure Firewall Threat Defense	Version 7.2.5.1
Cisco Secure Firewall Threat Defense	Version 7.2.5.2
Cisco Secure Firewall Threat Defense	Version 7.2.5
Cisco Secure Firewall Threat Defense	Version 7.2.6
Cisco Secure Firewall Threat Defense	Version 7.2.7
Cisco Secure Firewall Threat Defense	Version 7.2.8.1
Cisco Secure Firewall Threat Defense	Version 7.2.8
Cisco Secure Firewall Threat Defense	Version 7.2.9
Cisco Secure Firewall Threat Defense	Version 7.3.0
Cisco Secure Firewall Threat Defense	Version 7.3.1.1
Cisco Secure Firewall Threat Defense	Version 7.3.1.2
Cisco Secure Firewall Threat Defense	Version 7.3.1
Cisco Secure Firewall Threat Defense	Version 7.4.0
Cisco Secure Firewall Threat Defense	Version 7.4.1.1
Cisco Secure Firewall Threat Defense	Version 7.4.1
Cisco Secure Firewall Threat Defense	Version 7.4.2.1
Cisco Secure Firewall Threat Defense	Version 7.4.2.2
Cisco Secure Firewall Threat Defense	Version 7.4.2.3
Cisco Secure Firewall Threat Defense	Version 7.4.2.4
Cisco Secure Firewall Threat Defense	Version 7.4.2
Cisco Secure Firewall Threat Defense	Version 7.4.3
Cisco Secure Firewall Threat Defense	Version 7.4.4
Cisco Secure Firewall Threat Defense	Version 7.4.7
Cisco Secure Firewall Threat Defense	Version 7.4.8
Cisco Secure Firewall Threat Defense	Version 7.6.0
Cisco Secure Firewall Threat Defense	Version 7.6.1
Cisco Secure Firewall Threat Defense	Version 7.6.2.1
Cisco Secure Firewall Threat Defense	Version 7.6.2
Cisco Secure Firewall Threat Defense	Version 7.6.4
Cisco Secure Firewall Threat Defense	Version 7.7.0
Cisco Secure Firewall Threat Defense	Version 7.7.10.1
Cisco Secure Firewall Threat Defense	Version 7.7.10
Cisco Secure Firewall Threat Defense	Version 7.7.11
Cisco Secure Firewall Threat Defense	Version 7.7.13

Related CWEs

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.

References (2)

https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asaftd-vpn-dos-dzv4mQFF

Source: psirt@cisco.com

Vendor Advisory

https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-20349

Source: 134c704f-9b21-4f2e-91b3-4a467353bcc0

US Government Resource

Timeline

No history available yet.