Vulnerability Monitor

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CVE-2026-20349

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.

Security Impact Summary

This vulnerability carries a HIGH severity rating with a CVSS v3.1 score of 8.6, indicating it can be exploited remotely over the network with relatively low complexity without requiring user interaction and does not require pre-existing privileges . The vulnerability impacts and availability (service disruption) for affected systems. Impacting 2 products from cisco, from cisco organizations running these solutions should prioritize assessment and patching.

Historical Context

Reported in 2026, this vulnerability emerged during an era marked by increased sophistication in supply chain attacks, cloud infrastructure vulnerabilities, and software-as-a-service (SaaS) security challenges. Security practices during this period emphasized zero-trust architectures, container security, and API protection.

Published

2026-08-11T17:17:48.833

Last Modified

2026-08-12T15:02:21.707

Status

Analyzed

Source

[email protected]

Severity

CVSSv3.1: 8.6 (HIGH)

Weaknesses

Type: Secondary
CWE-244

Affected Vendors & Products

Type	Vendor	Product	Version/Range	Vulnerable?
Operating System	cisco	adaptive_security_appliance_software	9.16.1	Yes
Operating System	cisco	adaptive_security_appliance_software	9.16.1.28	Yes
Operating System	cisco	adaptive_security_appliance_software	9.16.2	Yes
Operating System	cisco	adaptive_security_appliance_software	9.16.2.3	Yes
Operating System	cisco	adaptive_security_appliance_software	9.16.2.7	Yes
Operating System	cisco	adaptive_security_appliance_software	9.16.2.11	Yes
Operating System	cisco	adaptive_security_appliance_software	9.16.2.13	Yes
Operating System	cisco	adaptive_security_appliance_software	9.16.2.14	Yes
Operating System	cisco	adaptive_security_appliance_software	9.16.3	Yes
Operating System	cisco	adaptive_security_appliance_software	9.16.3.3	Yes
Operating System	cisco	adaptive_security_appliance_software	9.16.3.14	Yes
Operating System	cisco	adaptive_security_appliance_software	9.16.3.15	Yes
Operating System	cisco	adaptive_security_appliance_software	9.16.3.19	Yes
Operating System	cisco	adaptive_security_appliance_software	9.16.3.23	Yes
Operating System	cisco	adaptive_security_appliance_software	9.16.4	Yes
Operating System	cisco	adaptive_security_appliance_software	9.16.4.9	Yes
Operating System	cisco	adaptive_security_appliance_software	9.16.4.14	Yes
Operating System	cisco	adaptive_security_appliance_software	9.16.4.19	Yes
Operating System	cisco	adaptive_security_appliance_software	9.16.4.27	Yes
Operating System	cisco	adaptive_security_appliance_software	9.16.4.38	Yes
Operating System	cisco	adaptive_security_appliance_software	9.16.4.39	Yes
Operating System	cisco	adaptive_security_appliance_software	9.16.4.42	Yes
Operating System	cisco	adaptive_security_appliance_software	9.16.4.48	Yes
Operating System	cisco	adaptive_security_appliance_software	9.16.4.55	Yes
Operating System	cisco	adaptive_security_appliance_software	9.16.4.57	Yes
Operating System	cisco	adaptive_security_appliance_software	9.16.4.61	Yes
Operating System	cisco	adaptive_security_appliance_software	9.16.4.62	Yes
Operating System	cisco	adaptive_security_appliance_software	9.16.4.67	Yes
Operating System	cisco	adaptive_security_appliance_software	9.16.4.70	Yes
Operating System	cisco	adaptive_security_appliance_software	9.16.4.71	Yes
Operating System	cisco	adaptive_security_appliance_software	9.16.4.76	Yes
Operating System	cisco	adaptive_security_appliance_software	9.16.4.82	Yes
Operating System	cisco	adaptive_security_appliance_software	9.16.4.84	Yes
Operating System	cisco	adaptive_security_appliance_software	9.16.4.85	Yes
Operating System	cisco	adaptive_security_appliance_software	9.16.4.89	Yes
Operating System	cisco	adaptive_security_appliance_software	9.16.4.92	Yes
Operating System	cisco	adaptive_security_appliance_software	9.18.1	Yes
Operating System	cisco	adaptive_security_appliance_software	9.18.1.3	Yes
Operating System	cisco	adaptive_security_appliance_software	9.18.2	Yes
Operating System	cisco	adaptive_security_appliance_software	9.18.2.5	Yes
Operating System	cisco	adaptive_security_appliance_software	9.18.2.7	Yes
Operating System	cisco	adaptive_security_appliance_software	9.18.2.8	Yes
Operating System	cisco	adaptive_security_appliance_software	9.18.3	Yes
Operating System	cisco	adaptive_security_appliance_software	9.18.3.39	Yes
Operating System	cisco	adaptive_security_appliance_software	9.18.3.46	Yes
Operating System	cisco	adaptive_security_appliance_software	9.18.3.53	Yes
Operating System	cisco	adaptive_security_appliance_software	9.18.3.55	Yes
Operating System	cisco	adaptive_security_appliance_software	9.18.3.56	Yes
Operating System	cisco	adaptive_security_appliance_software	9.18.4	Yes
Operating System	cisco	adaptive_security_appliance_software	9.18.4.5	Yes
Operating System	cisco	adaptive_security_appliance_software	9.18.4.8	Yes
Operating System	cisco	adaptive_security_appliance_software	9.18.4.22	Yes
Operating System	cisco	adaptive_security_appliance_software	9.18.4.24	Yes
Operating System	cisco	adaptive_security_appliance_software	9.18.4.29	Yes
Operating System	cisco	adaptive_security_appliance_software	9.18.4.34	Yes
Operating System	cisco	adaptive_security_appliance_software	9.18.4.40	Yes
Operating System	cisco	adaptive_security_appliance_software	9.18.4.47	Yes
Operating System	cisco	adaptive_security_appliance_software	9.18.4.50	Yes
Operating System	cisco	adaptive_security_appliance_software	9.18.4.52	Yes
Operating System	cisco	adaptive_security_appliance_software	9.18.4.53	Yes
Operating System	cisco	adaptive_security_appliance_software	9.18.4.57	Yes
Operating System	cisco	adaptive_security_appliance_software	9.18.4.66	Yes
Operating System	cisco	adaptive_security_appliance_software	9.18.4.67	Yes
Operating System	cisco	adaptive_security_appliance_software	9.18.4.68	Yes
Operating System	cisco	adaptive_security_appliance_software	9.18.4.71	Yes
Operating System	cisco	adaptive_security_appliance_software	9.18.4.76	Yes
Operating System	cisco	adaptive_security_appliance_software	9.18.4.82	Yes
Operating System	cisco	adaptive_security_appliance_software	9.18.4.90	Yes
Operating System	cisco	adaptive_security_appliance_software	9.18.4.135	Yes
Operating System	cisco	adaptive_security_appliance_software	9.19.1	Yes
Operating System	cisco	adaptive_security_appliance_software	9.19.1.5	Yes
Operating System	cisco	adaptive_security_appliance_software	9.19.1.9	Yes
Operating System	cisco	adaptive_security_appliance_software	9.19.1.12	Yes
Operating System	cisco	adaptive_security_appliance_software	9.19.1.18	Yes
Operating System	cisco	adaptive_security_appliance_software	9.19.1.22	Yes
Operating System	cisco	adaptive_security_appliance_software	9.19.1.24	Yes
Operating System	cisco	adaptive_security_appliance_software	9.19.1.27	Yes
Operating System	cisco	adaptive_security_appliance_software	9.19.1.28	Yes
Operating System	cisco	adaptive_security_appliance_software	9.19.1.31	Yes
Operating System	cisco	adaptive_security_appliance_software	9.19.1.37	Yes
Operating System	cisco	adaptive_security_appliance_software	9.19.1.38	Yes
Operating System	cisco	adaptive_security_appliance_software	9.19.1.42	Yes
Operating System	cisco	adaptive_security_appliance_software	9.20.1	Yes
Operating System	cisco	adaptive_security_appliance_software	9.20.1.5	Yes
Operating System	cisco	adaptive_security_appliance_software	9.20.2	Yes
Operating System	cisco	adaptive_security_appliance_software	9.20.2.10	Yes
Operating System	cisco	adaptive_security_appliance_software	9.20.2.21	Yes
Operating System	cisco	adaptive_security_appliance_software	9.20.2.22	Yes
Operating System	cisco	adaptive_security_appliance_software	9.20.3	Yes
Operating System	cisco	adaptive_security_appliance_software	9.20.3.4	Yes
Operating System	cisco	adaptive_security_appliance_software	9.20.3.7	Yes
Operating System	cisco	adaptive_security_appliance_software	9.20.3.9	Yes
Operating System	cisco	adaptive_security_appliance_software	9.20.3.10	Yes
Operating System	cisco	adaptive_security_appliance_software	9.20.3.13	Yes
Operating System	cisco	adaptive_security_appliance_software	9.20.3.16	Yes
Operating System	cisco	adaptive_security_appliance_software	9.20.3.20	Yes
Operating System	cisco	adaptive_security_appliance_software	9.20.4	Yes
Operating System	cisco	adaptive_security_appliance_software	9.20.4.7	Yes
Operating System	cisco	adaptive_security_appliance_software	9.20.4.10	Yes
Operating System	cisco	adaptive_security_appliance_software	9.20.4.14	Yes
Operating System	cisco	adaptive_security_appliance_software	9.20.4.19	Yes
Operating System	cisco	adaptive_security_appliance_software	9.20.4.22	Yes
Operating System	cisco	adaptive_security_appliance_software	9.20.4.28	Yes
Operating System	cisco	adaptive_security_appliance_software	9.20.4.30	Yes
Operating System	cisco	adaptive_security_appliance_software	9.20.4.34	Yes
Operating System	cisco	adaptive_security_appliance_software	9.20.4.46	Yes
Operating System	cisco	adaptive_security_appliance_software	9.22.1.1	Yes
Operating System	cisco	adaptive_security_appliance_software	9.22.1.2	Yes
Operating System	cisco	adaptive_security_appliance_software	9.22.1.3	Yes
Operating System	cisco	adaptive_security_appliance_software	9.22.1.6	Yes
Operating System	cisco	adaptive_security_appliance_software	9.22.2	Yes
Operating System	cisco	adaptive_security_appliance_software	9.22.2.4	Yes
Operating System	cisco	adaptive_security_appliance_software	9.22.2.9	Yes
Operating System	cisco	adaptive_security_appliance_software	9.22.2.13	Yes
Operating System	cisco	adaptive_security_appliance_software	9.22.2.14	Yes
Operating System	cisco	adaptive_security_appliance_software	9.22.2.20	Yes
Operating System	cisco	adaptive_security_appliance_software	9.22.2.32	Yes
Operating System	cisco	adaptive_security_appliance_software	9.22.3	Yes
Operating System	cisco	adaptive_security_appliance_software	9.22.3.5	Yes
Operating System	cisco	adaptive_security_appliance_software	9.23.1	Yes
Operating System	cisco	adaptive_security_appliance_software	9.23.1.3	Yes
Operating System	cisco	adaptive_security_appliance_software	9.23.1.7	Yes
Operating System	cisco	adaptive_security_appliance_software	9.23.1.13	Yes
Operating System	cisco	adaptive_security_appliance_software	9.23.1.19	Yes
Operating System	cisco	adaptive_security_appliance_software	9.23.1.22	Yes
Operating System	cisco	adaptive_security_appliance_software	9.23.1.26	Yes
Operating System	cisco	adaptive_security_appliance_software	9.23.1.32	Yes
Operating System	cisco	adaptive_security_appliance_software	9.23.1.195	Yes
Operating System	cisco	adaptive_security_appliance_software	9.24.1	Yes
Operating System	cisco	adaptive_security_appliance_software	9.24.1.5	Yes
Operating System	cisco	adaptive_security_appliance_software	9.24.1.9	Yes
Operating System	cisco	adaptive_security_appliance_software	9.24.1.11	Yes
Operating System	cisco	adaptive_security_appliance_software	9.24.1.155	Yes
Application	cisco	secure_firewall_threat_defense	7.0.0	Yes
Application	cisco	secure_firewall_threat_defense	7.0.0.1	Yes
Application	cisco	secure_firewall_threat_defense	7.0.1	Yes
Application	cisco	secure_firewall_threat_defense	7.0.1.1	Yes
Application	cisco	secure_firewall_threat_defense	7.0.2	Yes
Application	cisco	secure_firewall_threat_defense	7.0.2.1	Yes
Application	cisco	secure_firewall_threat_defense	7.0.3	Yes
Application	cisco	secure_firewall_threat_defense	7.0.4	Yes
Application	cisco	secure_firewall_threat_defense	7.0.5	Yes
Application	cisco	secure_firewall_threat_defense	7.0.6	Yes
Application	cisco	secure_firewall_threat_defense	7.0.6.1	Yes
Application	cisco	secure_firewall_threat_defense	7.0.6.2	Yes
Application	cisco	secure_firewall_threat_defense	7.0.6.3	Yes
Application	cisco	secure_firewall_threat_defense	7.0.7	Yes
Application	cisco	secure_firewall_threat_defense	7.0.8	Yes
Application	cisco	secure_firewall_threat_defense	7.0.8.1	Yes
Application	cisco	secure_firewall_threat_defense	7.0.9	Yes
Application	cisco	secure_firewall_threat_defense	7.2.0	Yes
Application	cisco	secure_firewall_threat_defense	7.2.0.1	Yes
Application	cisco	secure_firewall_threat_defense	7.2.1	Yes
Application	cisco	secure_firewall_threat_defense	7.2.2	Yes
Application	cisco	secure_firewall_threat_defense	7.2.3	Yes
Application	cisco	secure_firewall_threat_defense	7.2.4	Yes
Application	cisco	secure_firewall_threat_defense	7.2.4.1	Yes
Application	cisco	secure_firewall_threat_defense	7.2.5	Yes
Application	cisco	secure_firewall_threat_defense	7.2.5.1	Yes
Application	cisco	secure_firewall_threat_defense	7.2.5.2	Yes
Application	cisco	secure_firewall_threat_defense	7.2.6	Yes
Application	cisco	secure_firewall_threat_defense	7.2.7	Yes
Application	cisco	secure_firewall_threat_defense	7.2.8	Yes
Application	cisco	secure_firewall_threat_defense	7.2.8.1	Yes
Application	cisco	secure_firewall_threat_defense	7.2.9	Yes
Application	cisco	secure_firewall_threat_defense	7.2.10	Yes
Application	cisco	secure_firewall_threat_defense	7.2.10.2	Yes
Application	cisco	secure_firewall_threat_defense	7.2.11	Yes
Application	cisco	secure_firewall_threat_defense	7.2.12	Yes
Application	cisco	secure_firewall_threat_defense	7.3.0	Yes
Application	cisco	secure_firewall_threat_defense	7.3.1	Yes
Application	cisco	secure_firewall_threat_defense	7.3.1.1	Yes
Application	cisco	secure_firewall_threat_defense	7.3.1.2	Yes
Application	cisco	secure_firewall_threat_defense	7.4.0	Yes
Application	cisco	secure_firewall_threat_defense	7.4.1	Yes
Application	cisco	secure_firewall_threat_defense	7.4.1.1	Yes
Application	cisco	secure_firewall_threat_defense	7.4.2	Yes
Application	cisco	secure_firewall_threat_defense	7.4.2.1	Yes
Application	cisco	secure_firewall_threat_defense	7.4.2.2	Yes
Application	cisco	secure_firewall_threat_defense	7.4.2.3	Yes
Application	cisco	secure_firewall_threat_defense	7.4.2.4	Yes
Application	cisco	secure_firewall_threat_defense	7.4.3	Yes
Application	cisco	secure_firewall_threat_defense	7.4.4	Yes
Application	cisco	secure_firewall_threat_defense	7.4.7	Yes
Application	cisco	secure_firewall_threat_defense	7.4.8	Yes
Application	cisco	secure_firewall_threat_defense	7.6.0	Yes
Application	cisco	secure_firewall_threat_defense	7.6.1	Yes
Application	cisco	secure_firewall_threat_defense	7.6.2	Yes
Application	cisco	secure_firewall_threat_defense	7.6.2.1	Yes
Application	cisco	secure_firewall_threat_defense	7.6.4	Yes
Application	cisco	secure_firewall_threat_defense	7.7.0	Yes
Application	cisco	secure_firewall_threat_defense	7.7.10	Yes
Application	cisco	secure_firewall_threat_defense	7.7.10.1	Yes
Application	cisco	secure_firewall_threat_defense	7.7.11	Yes
Application	cisco	secure_firewall_threat_defense	7.7.13	Yes
Application	cisco	secure_firewall_threat_defense	10.0.0	Yes
Application	cisco	secure_firewall_threat_defense	10.0.2	Yes

References

https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asaftd-vpn-dos-dzv4mQFF Vendor Advisory ([email protected])
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-20349 US Government Resource (134c704f-9b21-4f2e-91b3-4a467353bcc0)

How SecUtils Interprets This CVE

SecUtils normalizes and enriches National Vulnerability Database (NVD) records by standardizing vendor and product identifiers, aggregating vulnerability metadata from both NVD and MITRE sources, and providing structured context for security teams. For cisco's affected products, we extract Common Platform Enumeration (CPE) data, Common Weakness Enumeration (CWE) classifications, CVSS severity metrics, and reference data to enable rapid vulnerability prioritization and asset correlation. This record contains no exploit code, proof-of-concept instructions, or attack methodologies—only defensive intelligence necessary for patch management, risk assessment, and security operations.