CVE-2026-76418Cisco Secure Firewall Adaptive Security Appliance (ASA) Software Vulnerability
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…
Published Oct 28, 2026 · Updated Oct 29, 2026 · Also known as EUVD-2026-112462, GHSA-3whv-82g3-5cwx
Key Facts
Patch immediately- CVE-2026-76418 is a high-severity vulnerability (CVSS 8.6 v3.1) affecting Cisco Secure Firewall Adaptive Security Appliance (ASA) Software, Cisco Secure Firewall Threat Defense (FTD) Software.
- It is exploited in the wild, listed in Industry KEV feed since Oct 28, 2026. No public exploit code is known.
- No fixed version is listed yet; check the vendor advisory for mitigations.
- Brandefense priority: patch immediately, because it is listed as exploited in the wild.
Scores
CVSS v3.1
8.6
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
EPSS (30-day exploit likelihood)
n/a
Exploit maturity
Exploited (KEV)
ATLAS score
50/100
Publication score, see How it works
Exploitation Verdict
KEV listed
Oct 28, 2026
0 days after publication
Federal due date
None
No federal due date
Ransomware use
Not reported
Attributed actors
None named
Exploit & Defence Guidance
Exploit maturity
Exploited (KEV)
Public exploit code
0
Proof-of-concept links
In-the-wild evidence
0
Reports of active use
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.
Known-Exploited Catalog Listings
| Catalog | Added | Remediation due | Ransomware use |
|---|---|---|---|
| Industry KEV feed | Oct 28, 2026 | n/a | Not reported |
Affected Products
4 affected entries in total| Product | Affected versions | Fixed in |
|---|---|---|
| Cisco Secure Firewall Adaptive Security Appliance (ASA) Software | >= 9.16.1 | n/a |
| Cisco Secure Firewall Threat Defense (FTD) Software | >= 7.0.0 | n/a |
Timeline
Publicly disclosed
Oct 28, 2026
Added to Industry KEV feed
Oct 28, 2026
Last updated
Oct 29, 2026
Weakness Type
- CWE-690 Unchecked Return Value to NULL Pointer Dereference
References
FAQ
Common Questions.
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.
Affected: Cisco Secure Firewall Adaptive Security Appliance (ASA) Software versions >= 9.16.1; Cisco Secure Firewall Threat Defense (FTD) Software versions >= 7.0.0. The full list is in the CVE brief.
It is exploited in the wild, listed in Industry KEV feed since Oct 28, 2026.
No, it is not currently listed in the CISA Known Exploited Vulnerabilities catalog.
No public exploit code is known.
No fixed version is listed yet; check the vendor advisory for mitigations.
Brandefense priority: patch immediately, because it is listed as exploited in the wild.
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