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8.6
CVE-2026-76418
cis · cisco secure firewall adaptive security appliance (asa)

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

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.

Affected Products

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

Also Affects

Downstream vendors/products affected by this vulnerability

VendorProductSourceConfidence
cissecure firewall threat defensecert_advisory90%
cisasa (adaptive security appliance)cert_advisory90%

References

  • https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asaftd-tunnel-dos-s6mgkb75

Related News (5 articles)

Tier B
BSI Advisories1h ago
[NEU] [hoch] Cisco Secure Firewall Threat Defense und Cisco ASA: Schwachstelle ermöglicht Denial of Service
→ No new info (linked only)
Tier B
CCCS Canada3h ago
Cisco security advisory (AV26-1102)
→ No new info (linked only)
Tier D
BleepingComputer4h ago
New Cisco firewall zero-day exploited to crash SSL VPN devices
→ No new info (linked only)
Tier D
The Hacker News4h ago
Cisco Patches Actively Exploited ASA and FTD VPN Flaw That Can Crash Firewalls
→ No new info (linked only)
Tier C
VulDB19h ago
CVE-2026-76418 | Cisco Secure Firewall Adaptive Security Appliance Remote Access SSL VPN service denial of service
→ No new info (linked only)

Discussion (0)

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CVSS 3.18.6 HIGH
VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
CISA KEV❌ No
Actively exploited❌ No
CWECWE-690
PublishedOct 28, 2026
Last enriched18h ago
Trending Score60
Source articles5
Independent5
Info Completeness5/14
Missing: vendor, product, versions, epss, kev, exploit, patch, iocs, mitre_attack

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Verification

State: verified
Confidence: 100%

Vulnerability Timeline

CVE Published
Oct 28, 2026
Discovered by ZDM
Oct 28, 2026