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A vulnerability in the SAML 2.0 single sign-on (SSO) feature of Cisco Secure Firewall ASA Software and Secure FTD Software could allow an unauthenticated, remote attacker to cause the device to reload unexpectedly, resulting in a DoS condition.
 This vulnerability is due to insufficient error checking when processing SAML messages. An attacker could exploit this vulnerability by sending crafted SAML messages to the SAML service. A successful exploit could allow the attacker to cause the device to reload, resulting in a DoS condition.

CVE-2026-20101 is a vulnerability in the SAML 2.0 single sign-on (SSO) implementation within Cisco Secure Firewall Adaptive Security Appliance (ASA) Software and Secure Firepower Threat Defense (FTD) Software. The root cause is insufficient error checking when processing SAML messages, which allows an unauthenticated remote attacker to send specially crafted SAML messages to the device. This malformed input triggers a flaw that causes the device to reload unexpectedly, leading to a denial-of-service (DoS) condition. The vulnerability affects a wide range of Cisco ASA software versions, from 9.12.1 through 9.23.1.3, covering many minor and patch releases, indicating a long-standing issue across multiple software generations. The CVSS v3.1 score is 8.6 (high severity), reflecting the vulnerability's network attack vector (AV:N), low attack complexity (AC:L), no privileges required (PR:N), no user interaction (UI:N), and a scope change (S:C) with impact limited to availability (A:H). There is no impact on confidentiality or integrity. No known exploits have been reported in the wild yet, but the vulnerability's characteristics make it a viable target for attackers seeking to disrupt network security infrastructure. The vulnerability specifically targets the SAML SSO feature, which is commonly used for authentication integration in enterprise environments, making it a critical component. Cisco has not yet provided patch links in the provided data, so organizations must monitor Cisco advisories closely for updates. The vulnerability's exploitation can cause significant operational disruption by forcing firewall devices to reload, potentially interrupting network traffic and security enforcement.

Detailed information about CVE-2026-20101: Use of Insufficiently Random Values in Cisco Cisco Secure Firewall Adaptive Security Appliance (ASA) Software affecti

CVE-2026-20101: Use of Insufficiently Random Values in Cisco Cisco Secure Firewall Adaptive Security Appliance (ASA) Software - Live Threat Intelligence - Threat Radar | OffSeq.com

CVE-2026-20101: Use of Insufficiently Random Values in Cisco Cisco Secure Firewall Adaptive Security Appliance (ASA) Software

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