CVE-2026-20349
What it is
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.
At a glance
- Exploitability
- Can be exploited over the network without logging in. High risk of service disruption.
- In the wild
- CISA lists this as exploited in real attacks. Treat as urgent.
- Fix
- A patch, advisory or fixed version is referenced. Upgrade or apply it.
Timeline
- ReservedThe CVE id was reserved by its CNA
- 2026-08-11 Exploited in the wildAdded to CISA's Known Exploited Vulnerabilities list
- PublishedDisclosed publicly on CVE.org and NVD
- 2026-08-14 Remediation deadlineCISA's due date for federal agencies to fix it
- Last updatedMost recent change to the record
Why it ranks here
- Exploited in the wild: yes, CISA lists it. This puts it above everything that is not.
- Exploit odds: 1.0% in the next 30 days (EPSS).
- Severity: 8.6 HIGH (CVSS).
- Fix: a patch or advisory is linked.
Details
- Published
- Last modified
- Added to CISA KEV
- 2026-08-11
- Exploit probability
- 1.0% · EPSS, next 30 days
- Weakness
- CWE-244
- Record status
- Analyzed
Affected
- Cisco Adaptive Security Appliance Software 9.16.1
- Cisco Adaptive Security Appliance Software 9.16.1.28
- Cisco Adaptive Security Appliance Software 9.16.2
- Cisco Adaptive Security Appliance Software 9.16.2.3
- Cisco Adaptive Security Appliance Software 9.16.2.7
- Cisco Adaptive Security Appliance Software 9.16.2.11
- Cisco Adaptive Security Appliance Software 9.16.2.13
- Cisco Adaptive Security Appliance Software 9.16.2.14
Attack profile CVSS 3.1 · 8.6
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- None
- User interaction
- None
- Scope
- Changed
- Confidentiality
- None
- Integrity
- None
- Availability
- High
Raw vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
Is it in your code?
Hand this to your coding agent. It searches your project for the affected products and checks versions. Nothing leaves your machine.
Read https://cve-list.com/agent/cve/CVE-2026-20349.md and follow it. Check whether this project is affected by CVE-2026-20349. Read only. Don't change anything and don't upload my code. Tell me yes, no or not sure, with the file as proof.
