Product:
Secure Firewall Adaptive Security Appliance
Summary
A vulnerability in the Remote Access SSL VPN functionality could allow an unauthenticated, remote attacker to exhaust device memory, resulting in a denial of service condition for new Remote Access SSL VPN connections. This does not affect the management interface, although it may become temporarily unresponsive. The vulnerability arises from trusting user input without validation.
Details
| Severity | Base Score | CVE |
|---|---|---|
| HIGH | 8.6 | CVE-2026-20103 |
Exploitation
An attacker can exploit this vulnerability by sending crafted packets to the Remote Access SSL VPN server. By doing so, the attacker can cause the device web interface to stop responding, leading to a denial of service condition for new connections.
Affected Products
- Secure Firewall Adaptive Security Appliance: Affected by the vulnerability in its Remote Access SSL VPN functionality.
- Secure Firewall Threat Defense: Also impacted by the same vulnerability affecting Remote Access SSL VPN connections.
Mitigation
To mitigate this vulnerability, it is recommended to implement input validation measures and monitor the device for unusual traffic patterns. Regular updates and patches from Cisco should be applied to ensure the device is protected against known vulnerabilities.