CVE-2026-20101:

A vulnerability in Cisco Secure Firewall ASA and FTD Software's SAML 2.0 SSO feature allows unauthenticated remote attackers to cause device reloads, resulting in denial of service.

Score
A numerical rating that indicates how dangerous this vulnerability is.

8.6High

Published Date:Mar 4, 2026
CISA KEV Date:*No Data*
Industries Affected:20

Exploitability

Score:3.9
Attack Vector:NETWORK
Attack Complexity:LOW
Privileges Required:NONE
User Interaction:NONE
Scope:CHANGED

Impact

Score:4.0
Confidentiality Impact:NONE
Integrity Impact:NONE
Availability Impact:HIGH

Description Preview

A vulnerability in Cisco Secure Firewall ASA and FTD Software's SAML 2.0 SSO feature allows unauthenticated remote attackers to cause device reloads, resulting in denial of service.

Overview

This vulnerability, identified as CVE-2026-20101, poses a significant risk to organizations using Cisco Secure Firewall ASA Software and Secure FTD Software with the SAML 2.0 SSO feature enabled. The flaw has a CVSS v3.1 base score of 8.6, indicating high severity. It requires no user interaction or privileges for exploitation, can be attacked from the network, and has a low attack complexity. While the vulnerability does not impact confidentiality or integrity, it can severely affect the availability of the affected systems by causing unexpected device reloads.

Remediation

As of the vulnerability's publication date, specific remediation details have not been provided. However, organizations using the affected Cisco products should consider the following general steps:
1. Monitor Cisco's security advisories for patches or updates addressing this vulnerability.
2. Implement network segmentation to limit exposure of affected devices.
3. Strengthen network security measures, such as implementing robust firewall rules and intrusion detection/prevention systems.
4. Consider temporarily disabling the SAML 2.0 SSO feature if it's not critical for operations, until a patch is available.
5. Regularly update and patch Cisco Secure Firewall ASA and FTD Software as soon as security updates become available.