What is the CVSS score of CVE-2026-20101?

CVE-2026-20101 has a CVSS 3.1 base score of 8.6 (High). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H. EPSS exploitation probability: 0.1%.

How to fix or mitigate CVE-2026-20101?

Within 24 hours: Inventory all Cisco ASA and FTD deployments; identify which are exposed to untrusted networks; assess business criticality of each. Within 7 days: Implement network segmentation to restrict SAML SSO endpoints to trusted IP ranges only; disable SAML SSO feature if not actively used; establish continuous monitoring for reload events. Within 30 days: Monitor Cisco security bulletins for patch availability; plan and execute patching in maintenance windows; validate functionality post-patch.

Adaptive Security Appliance Software CVE-2026-20101

HIGH

Use of Insufficiently Random Values (CWE-330)

2026-03-04 psirt@cisco.com

Information Disclosure Cisco Adaptive Security Appliance Software Firepower Threat Defense Software

8.6

CVSS 3.1 · Vendor: cisco

View

Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata – not a confirmed exploit chain

Access

Send crafted SAML message
Exploit

Trigger insufficient error checking
Execution

Device reload
Impact

Denial of service

Vulnerability Assessment

Weakness	CWE CWE-330 OWASP Top 10:2025 A04:2025 - Cryptographic Failures ASVS 5.0 V11 - Cryptography Cryptographic random values
Exploitation Conditions	SAML 2.0 SSO feature must be enabled and accessible on Cisco Secure Firewall ASA or Secure FTD device; no authentication required for SAML service endpoint.
Impact	CVSS 8.6 (HIGH). Attack vector: Network. Complexity: Low. Privileges required: None. User interaction: None. Exploitation no authentication required. Exploitable via remote/network.
Exploit ScenarioDerived	A remote attacker without authentication could exploit this vulnerability to cause the device to reload, resulting in a DoS condition.

This Week Schedule remediation this week. Why: HIGH severity (CVSS 7.0-8.9).

No patch listed yet 0.1% exploitation probability (EPSS)

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AnalysisAIv1 – Mar 12, 2026

Cisco Secure Firewall ASA and Secure FTD devices can be remotely rebooted by unauthenticated attackers through malformed SAML 2.0 authentication messages, causing service unavailability due to insufficient input validation. The vulnerability has a high attack surface as it requires no authentication or user interaction and affects the device's core authentication mechanism. No patch is currently available.

Earlier versions of this analysis (1)

v1 Mar 12, 2026 - 22:05 CVSS 8.6

RemediationAI

Monitor vendor advisories for a patch. Restrict network access to the affected service where possible.

Affects your stack

Find out whether the stacks and servers you run are on an affected version.

Checking this CVE against your own stacks and servers is part of the Basic plan and up.

Technical ContextAI · show details

Classified as CWE-330 (Use of Insufficiently Random Values). 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

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Exploit and PoC references, threat intelligence from 22 sources

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Severity by source

Vendor (cisco) PRIMARY 8.6 HIGH

AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H

Primary rating from Vendor (cisco) · only source for this CVE.

CVSS VectorVendor: cisco

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Changed

Confidentiality

None

Integrity

None

Availability

High

DescriptionCVE.org

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.

Executive ViewAI

Why It Matters

A critical vulnerability in Cisco Secure Firewall ASA and FTD SAML SSO functionality allows remote attackers to crash affected devices without authentication, disrupting network access and security services. Organizations using these devices for perimeter security or remote access are at immediate risk of service outages until mitigation or patching is completed.

Business Impact: High

Compensating Controls

Disable SAML 2.0 SSO feature if alternative authentication methods are available; implement network-based access controls (WAF, firewall rules) to restrict SAML endpoint exposure to trusted networks only; segment SAML traffic to specific secure zones; enable detailed logging and alerting on device reload events for early detection; deploy load balancers or failover devices to maintain availability during potential DoS events; monitor vendor advisories for patch release timeline.

Threat Intelligence Overview

EPSS Score

0.1%

Top 67% exploitable

Data Quality

4 sources

Confidence: Medium

NVD

CVE.org

EPSS

VulDB

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue

Severity HIGH

CISA KEV No

Public POC No

EPSS 0.1%

Patch available No

Active threat No

Deciding rule

HIGH severity (CVSS 7.0-8.9)

What every action level means

Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.

Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.

This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.

This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.

Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.

SSVC AssessmentENISA

SSVC Decision· derived

Scheduled

Exploitation· derived

None

System Exposure· derived

Open

Automatable· derived

Yes

Human Impact

High

Priority Score

Low Medium High Critical

KEV: 0

EPSS: 0

CVSS: +43

PoC: 0

Weaponized: 0

Threat intel: 0

Gov advisory: 0

Attack Technique

Information Disclosure MEDIUM

Information disclosure occurs when an application unintentionally exposes sensitive data that aids attackers in reconnaissance or directly compromises security.