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CVE-2026-20103

Secure Firewall - Adaptive Security Appliance (ASA) Software and Secure Firewall Threat Defense (FTD) Software

Cisco CVSS 8.6 Updated March 16, 2026

Executive Risk Summary

"A vulnerability in the Remote Access SSL VPN functionality of Cisco Secure Firewall Adaptive Security Appliance (ASA) Software and Secure Firewall Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to exhaust device memory resulting in a denial of service (DoS) condition. This vulnerability is due to trusting user input without validation and can be exploited by sending crafted packets to the Remote Access SSL VPN server."

Operational Audit Arsenal

Target Type Firmware
Target Asset Cisco Secure Firewall ASA/FTD Software
Standard Path https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asaftd-vpn-m9sx6MbC

Manual Verification Required

This is a non-Windows asset (Cisco). Use the target asset details and official path provided above to verify your current version against the official vendor advisories listed below.

Patch Impact Forecast

Reboot Required Likely

Temporary loss of Remote Access SSL VPN connectivity and potential temporary unresponsiveness of the management interface

Internal Work Notes

CVE-2026-20103: Potential DoS vulnerability in Cisco Secure Firewall ASA/FTD Software Remote Access SSL VPN, requiring firmware update to prevent exploitation

Technical Intelligence & Operational Utilities • Delivered Weekly

Intelligence Sources

Related Cisco Threats

Data compiled from NVD, MSRC, and CISA KEV Catalog. Intelligence synthesized via AI. Scripts provided for diagnostic purposes under MIT License.