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CVE-2026-76418

Cisco Secure Firewall Adaptive Security Appliance and Secure Firewall Threat Defense Software Remote Access SSL VPN Tunnel Denial of Service Vulnerability

  • High 8.6
  • Exploited: added to CISA KEV 29 Oct 2026

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.

Key facts

Published
28 Oct 2026
Last changed
30 Oct 2026
Assigned by
cisco
KEV added
29 Oct 2026
KEV fix due
1 Nov 2026
EPSS
0.821% likely to be exploited in the next 30 days, higher than 57.855% of CVEs (scores for 15 Nov 2026)
SSVC (CISA)
Exploitation: active; Automatable: yes; Technical impact: partial

Severity scores

Each score is shown as its source gave it. They are not averaged or merged.

  • 8.6CVSS 3.1, Highfrom the CNA (cisco)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H

What to do

  • 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.CISA KEV required action

Historical context and remediation

This reference retains the original CVE publication date. A recent record update does not mean a new attack occurred.

No separately sourced impact summary is available on this page yet. Consult the description, version data and dated exploitation evidence.

Version statuses below come from the CNA. An “unaffected” version is not necessarily a currently supported release or proof of a patch date. EPSS is a dated risk estimate, not a count of historical attacks.

Read the original CVE record.

Affected products

VendorProductVersions
CiscoCisco Secure Firewall Adaptive Security Appliance (ASA) Software
  • Default status: unknown
  • 9.16.1 (affected)
  • 9.16.1.28 (affected)
  • 9.16.2 (affected)
  • 9.16.2.3 (affected)
  • 9.16.2.7 (affected)
  • 9.16.2.11 (affected)
  • 9.16.2.13 (affected)
  • 9.16.2.14 (affected)
  • 9.16.3.3 (affected)
  • 9.16.3 (affected)
  • 9.16.3.14 (affected)
  • 9.18.1 (affected)
  • 9.16.3.15 (affected)
  • 9.18.1.3 (affected)
  • 9.18.2 (affected)
  • 9.16.3.19 (affected)
  • 9.16.3.23 (affected)
  • 9.18.2.5 (affected)
  • 9.16.4 (affected)
  • 9.18.2.7 (affected)
  • 9.19.1 (affected)
  • 9.16.4.9 (affected)
  • 9.18.2.8 (affected)
  • 9.16.4.14 (affected)
  • 9.18.3 (affected)
  • 9.19.1.5 (affected)
  • 9.16.4.18 (affected)
  • 9.19.1.9 (affected)
  • 9.18.3.39 (affected)
  • 9.16.4.19 (affected)
  • 9.19.1.12 (affected)
  • 9.18.3.46 (affected)
  • 9.16.4.27 (affected)
  • 9.19.1.18 (affected)
  • 9.18.3.53 (affected)
  • 9.18.3.55 (affected)
  • 9.16.4.38 (affected)
  • 9.16.4.39 (affected)
  • 9.18.3.56 (affected)
  • 9.20.1 (affected)
  • 9.16.4.42 (affected)
  • 9.19.1.22 (affected)
  • 9.18.4 (affected)
  • 9.20.1.5 (affected)
  • 9.18.4.5 (affected)
  • 9.19.1.24 (affected)
  • 9.16.4.48 (affected)
  • 9.18.4.8 (affected)
  • 9.20.2 (affected)
  • 9.19.1.27 (affected)
  • 9.16.4.55 (affected)
  • 9.18.4.22 (affected)
  • 9.20.2.10 (affected)
  • 9.16.4.57 (affected)
  • 9.19.1.28 (affected)
  • 9.18.4.24 (affected)
  • 9.20.2.21 (affected)
  • 9.16.4.61 (affected)
  • 9.19.1.31 (affected)
  • 9.18.4.29 (affected)
  • 9.20.2.22 (affected)
  • 9.16.4.62 (affected)
  • 9.18.4.34 (affected)
  • 9.20.3 (affected)
  • 9.16.4.67 (affected)
  • 9.16.4.70 (affected)
  • 9.18.4.40 (affected)
  • 9.23.1 (affected)
  • 9.22.1.1 (affected)
  • 9.16.4.71 (affected)
  • 9.20.3.4 (affected)
  • 9.18.4.47 (affected)
  • 9.20.3.7 (affected)
  • 9.19.1.37 (affected)
  • 9.16.4.76 (affected)
  • 9.20.3.9 (affected)
  • 9.19.1.38 (affected)
  • 9.18.4.50 (affected)
  • 9.22.1.3 (affected)
  • 9.20.3.10 (affected)
  • 9.22.1.2 (affected)
  • 9.18.4.52 (affected)
  • 9.20.3.13 (affected)
  • 9.22.1.6 (affected)
  • 9.18.4.53 (affected)
  • 9.16.4.82 (affected)
  • 9.22.2 (affected)
  • 9.20.3.16 (affected)
  • 9.19.1.42 (affected)
  • 9.18.4.57 (affected)
  • 9.16.4.84 (affected)
  • 9.23.1.3 (affected)
  • 9.20.3.20 (affected)
  • 9.22.2.4 (affected)
  • 9.23.1.7 (affected)
  • 9.20.4 (affected)
  • 9.22.2.9 (affected)
  • 9.23.1.13 (affected)
  • 9.20.4.7 (affected)
  • 9.22.2.13 (affected)
  • 9.18.4.66 (affected)
  • 9.20.4.10 (affected)
  • 9.23.1.19 (affected)
  • 9.16.4.85 (affected)
  • 9.22.2.14 (affected)
  • 9.18.4.67 (affected)
  • 9.24.1 (affected)
  • 9.18.4.68 (affected)
  • 9.23.1.22 (affected)
  • 9.20.4.14 (affected)
  • 9.22.2.20 (affected)
  • 9.18.4.71 (affected)
  • 9.20.4.19 (affected)
  • 9.23.1.26 (affected)
  • 9.16.4.89 (affected)
  • 9.22.2.32 (affected)
  • 9.18.4.76 (affected)
  • 9.22.3 (affected)
  • 9.24.1.5 (affected)
  • 9.20.4.22 (affected)
  • 9.24.1.9 (affected)
  • 9.20.4.28 (affected)
  • 9.22.3.5 (affected)
  • 9.16.4.92 (affected)
  • 9.18.4.135 (affected)
  • 9.23.1.195 (affected)
  • 9.20.4.30 (affected)
  • 9.24.1.155 (affected)
  • 9.23.1.32 (affected)
  • 9.24.1.11 (affected)
  • 9.20.4.34 (affected)
  • 9.18.4.82 (affected)
  • 9.24.10 (affected)
  • 9.18.4.90 (affected)
  • 9.20.4.46 (affected)
  • 9.20.4.235 (affected)
  • 9.20.4.49 (affected)
  • 9.22.3.26 (affected)
  • 9.16.4.103 (affected)
  • 9.18.4.94 (affected)
  • 9.23.1.47 (affected)
  • 9.24.1.26 (affected)
CiscoCisco Secure Firewall Threat Defense (FTD) Software
  • Default status: unknown
  • 7.0.0 (affected)
  • 7.0.0.1 (affected)
  • 7.0.1 (affected)
  • 7.0.1.1 (affected)
  • 7.0.2 (affected)
  • 7.2.0 (affected)
  • 7.0.2.1 (affected)
  • 7.0.3 (affected)
  • 7.2.0.1 (affected)
  • 7.0.4 (affected)
  • 7.2.1 (affected)
  • 7.0.5 (affected)
  • 7.3.0 (affected)
  • 7.2.2 (affected)
  • 7.2.3 (affected)
  • 7.3.1 (affected)
  • 7.2.4 (affected)
  • 7.0.6 (affected)
  • 7.2.5 (affected)
  • 7.2.4.1 (affected)
  • 7.3.1.1 (affected)
  • 7.4.0 (affected)
  • 7.0.6.1 (affected)
  • 7.2.5.1 (affected)
  • 7.4.1 (affected)
  • 7.2.6 (affected)
  • 7.0.6.2 (affected)
  • 7.4.1.1 (affected)
  • 7.2.7 (affected)
  • 7.2.5.2 (affected)
  • 7.3.1.2 (affected)
  • 7.2.8 (affected)
  • 7.6.0 (affected)
  • 7.4.2 (affected)
  • 7.2.8.1 (affected)
  • 7.0.6.3 (affected)
  • 7.4.2.1 (affected)
  • 7.2.9 (affected)
  • 7.0.7 (affected)
  • 7.7.0 (affected)
  • 7.4.2.2 (affected)
  • 7.2.10 (affected)
  • 7.6.1 (affected)
  • 7.4.2.3 (affected)
  • 7.0.8 (affected)
  • 7.6.2 (affected)
  • 7.7.10 (affected)
  • 7.7.11 (affected)
  • 7.0.8.1 (affected)
  • 7.6.2.1 (affected)
  • 7.7.10.1 (affected)
  • 7.4.2.4 (affected)
  • 7.2.10.2 (affected)
  • 7.4.3 (affected)
  • 7.6.4 (affected)
  • 10.0.0 (affected)
  • 7.4.4 (affected)
  • 7.0.9 (affected)
  • 7.2.11 (affected)
  • 7.4.7 (affected)
  • 7.4.8 (affected)
  • 7.2.12 (affected)
  • 7.6.6 (affected)
  • 7.7.13 (affected)
  • 10.0.2 (affected)
  • 7.0.10 (affected)
  • 10.1.0 (affected)

Timeline

  1. 28 Oct 2026 Published
  2. 29 Oct 2026 CVE-2026-76418 added to CISA KEV
  3. 29 Oct 2026 Added to the CISA KEV catalogue

Weakness

Related coverage

References