CVE-2026-20349 KEV
Patch first
On CISA KEV — known exploited in the wild, due 2026-08-14.
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.
Scoring
| CVSS | 8.6 (HIGH, v3.1) |
|---|---|
| Vector | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H |
| EPSS | 1.01% — more likely to be exploited than 62% of all CVEs |
| Weakness | CWE-244 |
| On CISA KEV | yes — remediate by 2026-08-14 |
| Public exploit | none known |
| Published | 2026-08-11 |
| Last modified | 2026-09-16 |
CISA KEV
| Name | Cisco Secure Firewall Adaptive Security Appliance (ASA) and Secure Firewall Threat Defense (FTD) Heap Inspection Vulnerability |
|---|---|
| Added | 2026-08-11 |
| Due | 2026-08-14 |
| Vendor / product | Cisco / Secure Firewall Adaptive Security Appliance (ASA) and Secure Firewall Threat Defense (FTD) |
| Ransomware use | none reported |
Affected (2)
| Vendor | Product |
|---|---|
| cisco | adaptive security appliance software |
| cisco | secure firewall threat defense |
References
→ the Explorer · watch your stack · NVD