Vulnerability Intelligence Report
Cisco Secure Adaptive Security Appliance Software, Secure Firewall Threat Defense Software and Secure Firewall Management Center Software Hardening Release - Protection Mechanism Failure Vulnerabilities
CVE-2026-20331
As part of Cisco's ongoing commitment to proactive security and product quality, the Cisco Secure Adaptive Security Appliance Software, Cisco Secure Firewall Threat Defense Software and Cisco Secure Firewall Management Center Software engineering team has conducted a comprehensive internal security review. This review resulted in a software hardening release that addresses multiple internally discovered vulnerabilities. The vulnerabilities tracked by CVE-2026-20331 are related to the failure of protection mechanisms issues that are grouped under the Common Weakness Enumeration (CWE) Pillar CWE-693.
No Active Exploit Signals
CVSS Base Score
9.6
CRITICAL
Exploitability:2.9
Impact Score:6.0
EPSS Probability:0.23%
Executive Threat Verdict
Evaluating...
Evaluating Threat Landscape...
Assessing known weaponization, exploitation telemetry, and federal advisories.
Attack Surface
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Authentication
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Weaponization
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SSVC Action
—
Weaknesses (CWE)
CWE-693 ↗Protection Mechanism Failure
Affected Products & Versions
| Vendor | Product | Affected Versions |
|---|---|---|
| Cisco | Cisco Secure Firewall Adaptive Security Appliance (ASA) Software | 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), 9.16.3.15 (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), 9.16.4.9 (affected), 9.18.2.8 (affected), 9.16.4.14 (affected), 9.18.3 (affected), 9.16.4.18 (affected), 9.18.3.39 (affected), 9.16.4.19 (affected), 9.18.3.46 (affected), 9.16.4.27 (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), 9.18.4 (affected), 9.20.1.5 (affected), 9.18.4.5 (affected), 9.16.4.48 (affected), 9.18.4.8 (affected), 9.20.2 (affected), 9.16.4.55 (affected), 9.18.4.22 (affected), 9.20.2.10 (affected), 9.16.4.57 (affected), 9.18.4.24 (affected), 9.20.2.21 (affected), 9.16.4.61 (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), 9.16.4.76 (affected), 9.20.3.9 (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), 9.20.4.235 (affected) |
| Cisco | Cisco Secure Firewall Management Center (FMC) | 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), 7.3.1 (affected), 7.2.3 (affected), 7.2.3.1 (affected), 7.2.4 (affected), 7.0.6 (affected), 7.2.4.1 (affected), 7.2.5 (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), 7.4.1.1 (affected), 7.0.6.2 (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), 7.2.10.1 (affected), 7.0.8.1 (affected), 7.6.2.1 (affected), 7.2.10.2 (affected), 7.7.10.1 (affected), 7.4.2.4 (affected), 7.4.3 (affected), 7.6.3 (affected), 7.7.11 (affected), 7.6.4 (affected), 10.0.0 (affected), 7.4.4 (affected), 7.4.5 (affected), 7.0.9 (affected), 7.2.11 (affected), 7.7.12 (affected), 7.6.5 (affected), 7.4.6 (affected), 10.0.1 (affected), 7.4.7 (affected) |
| Cisco | Cisco Secure Firewall Threat Defense (FTD) Software | 7.0.0.1 (affected), 7.0.1 (affected), 7.0.1.1 (affected), 7.0.2 (affected), 7.0.2.1 (affected), 7.0.3 (affected), 7.0.4 (affected), 7.0.5 (affected), 7.3.0 (affected), 7.3.1 (affected), 7.0.6 (affected), 7.3.1.1 (affected), 7.4.0 (affected), 7.0.6.1 (affected), 7.4.1 (affected), 7.0.6.2 (affected), 7.4.1.1 (affected), 7.3.1.2 (affected), 7.6.0 (affected), 7.4.2 (affected), 7.0.6.3 (affected), 7.4.2.1 (affected), 7.0.7 (affected), 7.7.0 (affected), 7.4.2.2 (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), 7.4.3 (affected), 7.6.4 (affected), 10.0.0 (affected), 7.4.4 (affected), 7.0.9 (affected), 7.4.7 (affected) |
References & Technical Advisories
No reference links found.
Threat Intelligence Signals
EPSS Score
0.229%
GitHub Advisory
Identity & Timeline
| Status | PUBLISHED |
| Assigning Authority | Cisco Systems, Inc. · Hosted Service · USA |
| Reserved | 2025-10-08T11:59:15 |
| Published | 2026-09-16T16:56:18 |
| Last Updated | 2026-09-18T19:09:40 |
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