Vulnerability Report

CVE-2026-20349

CISA KEV Active

Title: CVE-2026-20349

DoS

Proof Of Concept

No public PoC currently indexed for CVE-2026-20349.

CWE Category CWE-244

Published Date Aug 11, 2026

Modified Date Aug 12, 2026

Exploit Status Not Found

Score 8.6 CVSS v3.1

Exploit Probability (EPSS)

2.21%

Vulnerability Summary

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.

Impacted Vendors

cisco 1

Reference Links

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

CVSS v3.1

Source Entity [email protected]

Severity HIGH

8.6

Attack Vector

NETWORK

Complexity

LOW

Privileges

N/A

Interaction

NONE

Confidentiality

N/A

Integrity

N/A

Availability

N/A

Scope

CHANGED

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

Associated Attack Patterns (CAPEC)

Total: Patterns