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7.7
Cisco Firewalls: Unauthenticated User Can Crash the System
CVE-2026-20100
Summary
An attacker with a valid VPN connection can crash your Cisco firewall, causing it to restart unexpectedly. This is because the firewall doesn't properly check user input, allowing an attacker to send malicious traffic that causes the system to crash. To protect your system, update your Cisco firewall software as soon as possible to the latest version.
Original title
A vulnerability in the LUA interperter of the Remote Access SSL VPN feature of Cisco Secure Firewall Adaptive Security Appliance (ASA) Software and Secure Firewall Threat Defense (FTD) Software cou...
Original description
A vulnerability in the LUA interperter of the Remote Access SSL VPN feature of Cisco Secure Firewall Adaptive Security Appliance (ASA) Software and Secure Firewall Threat Defense (FTD) Software could allow an authenticated, remote attacker with a valid VPN connection to cause the device to reload unexpectedly, resulting in a denial of service (DoS) condition. This does not affect the management or MUS interfaces.
This vulnerability is due to trusting user input without validation in the LUA interprerter. An attacker could exploit this vulnerability by sending crafted HTTP packets to the Remote Access SSL VPN server. A successful exploit could allow the attacker to cause the device to reload, resulting in a DoS condition.
This vulnerability is due to trusting user input without validation in the LUA interprerter. An attacker could exploit this vulnerability by sending crafted HTTP packets to the Remote Access SSL VPN server. A successful exploit could allow the attacker to cause the device to reload, resulting in a DoS condition.
nvd CVSS3.1
7.7
Vulnerability type
CWE-120
Classic Buffer Overflow
Published: 4 Mar 2026 · Updated: 13 Mar 2026 · First seen: 6 Mar 2026