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CVE-2026-20101

HIGHCVSS 8.6/10EPSS 0.35%

Last modified

CVE-2026-20101 is a high-severity vulnerability rated 8.6/10 on the CVSS scale. 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. EPSS estimates a 0.35% chance of exploitation in the next 30 days.

Description

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.

Metrics

CVSS 3.1
8.6/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H

EPSS Probability
0.35%

27.3th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

VendorProductVersions
CiscoAdaptive Security Appliance Software>= 9.12.1, < 9.16.4.85
CiscoAdaptive Security Appliance Software>= 9.17.1, < 9.18.4.66
CiscoAdaptive Security Appliance Software>= 9.19.1, < 9.20.4
CiscoAdaptive Security Appliance Software>= 9.22.1.1, < 9.22.2.4
CiscoAdaptive Security Appliance Software>= 9.23.1, < 9.23.1.7
CiscoFirepower Threat Defense Software>= 6.4.0, < 7.0.9
CiscoFirepower Threat Defense Software>= 7.1.0, < 7.2.11
CiscoFirepower Threat Defense Software>= 7.3.0, < 7.4.3
CiscoFirepower Threat Defense Software>= 7.6.0, < 7.6.4
CiscoFirepower Threat Defense Software>= 7.7.0, < 7.7.11

References

Timeline

Published
Last Modified
Status
Analyzed

Frequently Asked Questions

What is CVE-2026-20101?
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.
How severe is CVE-2026-20101?
CVE-2026-20101 has a CVSS score of 8.6/10 (HIGH severity). The EPSS model estimates a 0.35% probability of exploitation in the next 30 days.
How do I fix CVE-2026-20101?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2026-20101?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST