CVE-2026-76418

HIGH CVSS 8.6 PoC Available
Published: 2026-10-28
Modified: 2026-10-30
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AI Threat Summary

CVE-2026-76418 is a high-severity vulnerability with a CVSS score of 8.6 affecting adaptive_security_appliance_software, adaptive_security_appliance_software. Authentication can be bypassed allowing unauthenticated access. Threat hunters should monitor for exploit attempts and apply vendor patches immediately.

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.

Attack Chain
1
Reconnaissance

Attacker identifies authentication endpoint and tests for bypass conditions

2
Initial Access

Attacker exploits CVE-2026-76418 authentication flaw to gain unauthorized access without valid credentials

3
Discovery

Attacker enumerates accessible resources, users, and configurations

4
Collection

Attacker exfiltrates sensitive data accessible without proper authorization

MITRE ATT&CK Techniques
T1078 Valid Accounts
Initial Access

Authentication bypass grants attacker access as legitimate user

T1548 Abuse Elevation Control Mechanism
Privilege Escalation

Bypassed auth may grant elevated or admin-level permissions

Indicators of Compromise
Type Value Description
user_agent Mozilla/5.0 (compatible; exploit/1.0) Generic exploit scanner user agent pattern
url /api/vuln-endpoint?payload=<malicious> Exploit attempt against adaptive_security_appliance_software endpoint — monitor access logs for anomalous params
Remediation
1. Apply vendor-supplied security patches immediately. 2. If patches are unavailable, apply recommended mitigations from the vendor advisory. 3. Enable WAF rules or IDS signatures to detect exploitation attempts. 4. Monitor logs for indicators of compromise listed above. 5. Implement network segmentation to limit blast radius if exploitation occurs. 6. Subscribe to vendor security advisories for this product.
Quick Facts
CVE ID CVE-2026-76418
CVSS Score 8.6
Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
Published 2026-10-28
Exploited Yes
CISA KEV Yes
PoC Available
Affected Products
  • cisco / adaptive_security_appliance_software
  • cisco / adaptive_security_appliance_software
  • cisco / adaptive_security_appliance_software
  • cisco / adaptive_security_appliance_software
  • cisco / adaptive_security_appliance_software
  • cisco / adaptive_security_appliance_software
  • cisco / adaptive_security_appliance_software 9.24.10
  • cisco / secure_firewall_threat_defense
  • cisco / secure_firewall_threat_defense
  • cisco / secure_firewall_threat_defense
  • +4 more…
References
External Resources
NVD Entry BleepingComputer The Hacker News