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CVE-2026-76418 Details

Description

A vulnerability in the Remote Access SSL VPN service of Cisco Secure Firewall Adaptive Security Appliance (ASA) Software and Cisco Secure Firewall Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to cause the device to reload unexpectedly, resulting in a denial of service (DoS) condition. This vulnerability is due to logic errors when secondary authentication is configured on a tunnel group. An attacker could exploit this vulnerability by sending a crafted request when connecting to the SSL remote access VPN. A successful exploit could allow the attacker to cause the affected device to reload, resulting in a DoS condition.

Metrics

CVSS 3.x Severity and Vector Strings:

CNA: [email protected]CVSS-B:8.6 HIGHVector:CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H

References to Advisories, Solutions, and Tools

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URL	Source(s)	Tag(s)
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-76418	CISA-ADP	US Government Resource
https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asaftd-tunnel-dos-s6mgkb75	[email protected]	Vendor Advisory

This CVE is in CISA's Known Exploited Vulnerabilities Catalog

Reference CISA's BOD 22-01 and Known Exploited Vulnerabilities Catalog for further guidance and requirements.

Vulnerability Name	Date Added	Due Date	Required Action
Cisco Secure Firewall ASA Software and Cisco Secure FTD Software Unchecked Return Value to NULL Pointer Dereference Vulnerability	Oct 29, 2026	Nov 1, 2026	Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.

Weakness Enumeration

CWE-ID	CWE Name	Source
CWE-690	Unchecked Return Value to NULL Pointer Dereference	[email protected]

Affected Products

Product	Versions
cisco adaptive security appliance software	< 9.16.4.104 >= 9.18, < 9.18.4.96 >= 9.19, < 9.20.4.50 >= 9.22, < 9.22.3.200 >= 9.23, < 9.23.1.48
CPE cpe:2.3:o:cisco:adaptive_security_appliance_software:::::::: cpe:2.3:o:cisco:adaptive_security_appliance_software:9.24.10:::::::* Remediation No remediation found in references.
cisco secure firewall threat defense	< 7.0.11 >= 7.2.0, < 7.2.13 >= 7.3.0, < 7.4.9 >= 7.6.0, <= 7.6.7 >= 7.7.0, < 7.7.14
CPE cpe:2.3:a:cisco:secure_firewall_threat_defense:::::::: cpe:2.3:a:cisco:secure_firewall_threat_defense:10.1.0:::::::* Remediation No remediation found in references.

Change History

7 change records found show changes

Date	Action	Recorded By
Oct 30, 2026	Initial Analysis	[email protected]
Oct 30, 2026	CVE Modified	CISA-ADP
Oct 29, 2026	CVE CISA KEV Update	Cybersecurity and Infrastructure Security Agency (CISA) U.S. Civilian Government
Oct 29, 2026	CVE Modified	CISA-ADP
Oct 29, 2026	CVE Modified	CISA-ADP
Oct 28, 2026	CVE Modified	CISA-ADP
Oct 28, 2026	New CVE Received	[email protected]