CVE-2026-20349

high Cisco ⚠️ CISA KEV — Exploited in the Wild
CVSS v3 Base Score
8.6
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
EPSS Score
1.0%
Exploitation probability in 30 days
Top 41% most likely to be exploited
Attack Characteristics
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Confidentiality
None
Integrity
None
Availability
High
Published: August 11, 2026 (26 days ago)
Last Modified: August 12, 2026
Vendor: Cisco
Source: NVD

⚠️ CISA Known Exploited Vulnerability

Added to KEV: 2026-08-11
Remediation Due: 2026-08-14 (⚠ 23d overdue)

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.

CWE

CWE-244

Affected Products

cisco adaptive security appliance softwarecisco secure firewall threat defense

References

🔗 sec.cloudapps.cisco.com 🔗 www.cisa.gov