CRITICAL
Cisco Secure Adaptive Security Appliance Software, Secure Firewall Threat Defense Software and Secure Firewall Management Center Software Hardening Release - Protection Mechanism Failure Vulnerabilities
Published Sep 16, 2026
9.6
CRITICALCVSS 3.1
EPSS 0.23%
Description
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.
Affected products
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- Version 9.16.1StatusaffectedConstraints-
- Version 9.16.1.28StatusaffectedConstraints-
- Version 9.16.2StatusaffectedConstraints-
- Version 9.16.2.11StatusaffectedConstraints-
- Version 9.16.2.13StatusaffectedConstraints-
- Version 9.16.2.14StatusaffectedConstraints-
- Version 9.16.2.3StatusaffectedConstraints-
- Version 9.16.2.7StatusaffectedConstraints-
- Version 9.16.3StatusaffectedConstraints-
- Version 9.16.3.14StatusaffectedConstraints-
- Version 9.16.3.15StatusaffectedConstraints-
- Version 9.16.3.19StatusaffectedConstraints-
- Version 9.16.3.23StatusaffectedConstraints-
- Version 9.16.3.3StatusaffectedConstraints-
- Version 9.16.4StatusaffectedConstraints-
- Version 9.16.4.14StatusaffectedConstraints-
- Version 9.16.4.18StatusaffectedConstraints-
- Version 9.16.4.19StatusaffectedConstraints-
- Version 9.16.4.27StatusaffectedConstraints-
- Version 9.16.4.38StatusaffectedConstraints-
- Version 9.16.4.39StatusaffectedConstraints-
- Version 9.16.4.42StatusaffectedConstraints-
- Version 9.16.4.48StatusaffectedConstraints-
- Version 9.16.4.55StatusaffectedConstraints-
- Version 9.16.4.57StatusaffectedConstraints-
- Version 9.16.4.61StatusaffectedConstraints-
- Version 9.16.4.62StatusaffectedConstraints-
- Version 9.16.4.67StatusaffectedConstraints-
- Version 9.16.4.70StatusaffectedConstraints-
- Version 9.16.4.71StatusaffectedConstraints-
- Version 9.16.4.76StatusaffectedConstraints-
- Version 9.16.4.82StatusaffectedConstraints-
- Version 9.16.4.84StatusaffectedConstraints-
- Version 9.16.4.85StatusaffectedConstraints-
- Version 9.16.4.89StatusaffectedConstraints-
- Version 9.16.4.9StatusaffectedConstraints-
- Version 9.16.4.92StatusaffectedConstraints-
- Version 9.18.1.3StatusaffectedConstraints-
- Version 9.18.2StatusaffectedConstraints-
- Version 9.18.2.5StatusaffectedConstraints-
- Version 9.18.2.7StatusaffectedConstraints-
- Version 9.18.2.8StatusaffectedConstraints-
- Version 9.18.3StatusaffectedConstraints-
- Version 9.18.3.39StatusaffectedConstraints-
- Version 9.18.3.46StatusaffectedConstraints-
- Version 9.18.3.53StatusaffectedConstraints-
- Version 9.18.3.55StatusaffectedConstraints-
- Version 9.18.3.56StatusaffectedConstraints-
- Version 9.18.4StatusaffectedConstraints-
- Version 9.18.4.135StatusaffectedConstraints-
- Version 9.18.4.22StatusaffectedConstraints-
- Version 9.18.4.24StatusaffectedConstraints-
- Version 9.18.4.29StatusaffectedConstraints-
- Version 9.18.4.34StatusaffectedConstraints-
- Version 9.18.4.40StatusaffectedConstraints-
- Version 9.18.4.47StatusaffectedConstraints-
- Version 9.18.4.5StatusaffectedConstraints-
- Version 9.18.4.50StatusaffectedConstraints-
- Version 9.18.4.52StatusaffectedConstraints-
- Version 9.18.4.53StatusaffectedConstraints-
- Version 9.18.4.57StatusaffectedConstraints-
- Version 9.18.4.66StatusaffectedConstraints-
- Version 9.18.4.67StatusaffectedConstraints-
- Version 9.18.4.68StatusaffectedConstraints-
- Version 9.18.4.71StatusaffectedConstraints-
- Version 9.18.4.76StatusaffectedConstraints-
- Version 9.18.4.8StatusaffectedConstraints-
- Version 9.18.4.82StatusaffectedConstraints-
- Version 9.19.1.42StatusaffectedConstraints-
- Version 9.20.1StatusaffectedConstraints-
- Version 9.20.1.5StatusaffectedConstraints-
- Version 9.20.2StatusaffectedConstraints-
- Version 9.20.2.10StatusaffectedConstraints-
- Version 9.20.2.21StatusaffectedConstraints-
- Version 9.20.2.22StatusaffectedConstraints-
- Version 9.20.3StatusaffectedConstraints-
- Version 9.20.3.10StatusaffectedConstraints-
- Version 9.20.3.13StatusaffectedConstraints-
- Version 9.20.3.16StatusaffectedConstraints-
- Version 9.20.3.20StatusaffectedConstraints-
- Version 9.20.3.4StatusaffectedConstraints-
- Version 9.20.3.7StatusaffectedConstraints-
- Version 9.20.3.9StatusaffectedConstraints-
- Version 9.20.4StatusaffectedConstraints-
- Version 9.20.4.10StatusaffectedConstraints-
- Version 9.20.4.14StatusaffectedConstraints-
- Version 9.20.4.19StatusaffectedConstraints-
- Version 9.20.4.22StatusaffectedConstraints-
- Version 9.20.4.235StatusaffectedConstraints-
- Version 9.20.4.28StatusaffectedConstraints-
- Version 9.20.4.30StatusaffectedConstraints-
- Version 9.20.4.34StatusaffectedConstraints-
- Version 9.20.4.7StatusaffectedConstraints-
- Version 9.22.1.1StatusaffectedConstraints-
- Version 9.22.1.2StatusaffectedConstraints-
- Version 9.22.1.3StatusaffectedConstraints-
- Version 9.22.1.6StatusaffectedConstraints-
- Version 9.22.2StatusaffectedConstraints-
- Version 9.22.2.13StatusaffectedConstraints-
- Version 9.22.2.14StatusaffectedConstraints-
- Version 9.22.2.20StatusaffectedConstraints-
- Version 9.22.2.32StatusaffectedConstraints-
- Version 9.22.2.4StatusaffectedConstraints-
- Version 9.22.2.9StatusaffectedConstraints-
- Version 9.22.3StatusaffectedConstraints-
- Version 9.22.3.5StatusaffectedConstraints-
- Version 9.23.1StatusaffectedConstraints-
- Version 9.23.1.13StatusaffectedConstraints-
- Version 9.23.1.19StatusaffectedConstraints-
- Version 9.23.1.195StatusaffectedConstraints-
- Version 9.23.1.22StatusaffectedConstraints-
- Version 9.23.1.26StatusaffectedConstraints-
- Version 9.23.1.3StatusaffectedConstraints-
- Version 9.23.1.32StatusaffectedConstraints-
- Version 9.23.1.7StatusaffectedConstraints-
- Version 9.24.1StatusaffectedConstraints-
- Version 9.24.1.11StatusaffectedConstraints-
- Version 9.24.1.155StatusaffectedConstraints-
- Version 9.24.1.5StatusaffectedConstraints-
- Version 9.24.1.9StatusaffectedConstraints-
- Version 9.24.10StatusaffectedConstraints-
- Version
-
- Version 10.0.0StatusaffectedConstraints-
- Version 10.0.1StatusaffectedConstraints-
- Version 7.0.0StatusaffectedConstraints-
- Version 7.0.0.1StatusaffectedConstraints-
- Version 7.0.1StatusaffectedConstraints-
- Version 7.0.1.1StatusaffectedConstraints-
- Version 7.0.2StatusaffectedConstraints-
- Version 7.0.2.1StatusaffectedConstraints-
- Version 7.0.3StatusaffectedConstraints-
- Version 7.0.4StatusaffectedConstraints-
- Version 7.0.5StatusaffectedConstraints-
- Version 7.0.6StatusaffectedConstraints-
- Version 7.0.6.1StatusaffectedConstraints-
- Version 7.0.6.2StatusaffectedConstraints-
- Version 7.0.6.3StatusaffectedConstraints-
- Version 7.0.7StatusaffectedConstraints-
- Version 7.0.8StatusaffectedConstraints-
- Version 7.0.8.1StatusaffectedConstraints-
- Version 7.0.9StatusaffectedConstraints-
- Version 7.2.0StatusaffectedConstraints-
- Version 7.2.0.1StatusaffectedConstraints-
- Version 7.2.1StatusaffectedConstraints-
- Version 7.2.10StatusaffectedConstraints-
- Version 7.2.10.1StatusaffectedConstraints-
- Version 7.2.10.2StatusaffectedConstraints-
- Version 7.2.11StatusaffectedConstraints-
- Version 7.2.2StatusaffectedConstraints-
- Version 7.2.3StatusaffectedConstraints-
- Version 7.2.3.1StatusaffectedConstraints-
- Version 7.2.4StatusaffectedConstraints-
- Version 7.2.4.1StatusaffectedConstraints-
- Version 7.2.5StatusaffectedConstraints-
- Version 7.2.5.1StatusaffectedConstraints-
- Version 7.2.5.2StatusaffectedConstraints-
- Version 7.2.6StatusaffectedConstraints-
- Version 7.2.7StatusaffectedConstraints-
- Version 7.2.8StatusaffectedConstraints-
- Version 7.2.8.1StatusaffectedConstraints-
- Version 7.2.9StatusaffectedConstraints-
- Version 7.3.0StatusaffectedConstraints-
- Version 7.3.1StatusaffectedConstraints-
- Version 7.3.1.1StatusaffectedConstraints-
- Version 7.3.1.2StatusaffectedConstraints-
- Version 7.4.0StatusaffectedConstraints-
- Version 7.4.1StatusaffectedConstraints-
- Version 7.4.1.1StatusaffectedConstraints-
- Version 7.4.2StatusaffectedConstraints-
- Version 7.4.2.1StatusaffectedConstraints-
- Version 7.4.2.2StatusaffectedConstraints-
- Version 7.4.2.3StatusaffectedConstraints-
- Version 7.4.2.4StatusaffectedConstraints-
- Version 7.4.3StatusaffectedConstraints-
- Version 7.4.4StatusaffectedConstraints-
- Version 7.4.5StatusaffectedConstraints-
- Version 7.4.6StatusaffectedConstraints-
- Version 7.4.7StatusaffectedConstraints-
- Version 7.6.0StatusaffectedConstraints-
- Version 7.6.1StatusaffectedConstraints-
- Version 7.6.2StatusaffectedConstraints-
- Version 7.6.2.1StatusaffectedConstraints-
- Version 7.6.3StatusaffectedConstraints-
- Version 7.6.4StatusaffectedConstraints-
- Version 7.6.5StatusaffectedConstraints-
- Version 7.7.0StatusaffectedConstraints-
- Version 7.7.10StatusaffectedConstraints-
- Version 7.7.10.1StatusaffectedConstraints-
- Version 7.7.11StatusaffectedConstraints-
- Version 7.7.12StatusaffectedConstraints-
- Version
-
- Version 10.0.0StatusaffectedConstraints-
- Version 7.0.0.1StatusaffectedConstraints-
- Version 7.0.1StatusaffectedConstraints-
- Version 7.0.1.1StatusaffectedConstraints-
- Version 7.0.2StatusaffectedConstraints-
- Version 7.0.2.1StatusaffectedConstraints-
- Version 7.0.3StatusaffectedConstraints-
- Version 7.0.4StatusaffectedConstraints-
- Version 7.0.5StatusaffectedConstraints-
- Version 7.0.6StatusaffectedConstraints-
- Version 7.0.6.1StatusaffectedConstraints-
- Version 7.0.6.2StatusaffectedConstraints-
- Version 7.0.6.3StatusaffectedConstraints-
- Version 7.0.7StatusaffectedConstraints-
- Version 7.0.8StatusaffectedConstraints-
- Version 7.0.8.1StatusaffectedConstraints-
- Version 7.0.9StatusaffectedConstraints-
- Version 7.3.0StatusaffectedConstraints-
- Version 7.3.1StatusaffectedConstraints-
- Version 7.3.1.1StatusaffectedConstraints-
- Version 7.3.1.2StatusaffectedConstraints-
- Version 7.4.0StatusaffectedConstraints-
- Version 7.4.1StatusaffectedConstraints-
- Version 7.4.1.1StatusaffectedConstraints-
- Version 7.4.2StatusaffectedConstraints-
- Version 7.4.2.1StatusaffectedConstraints-
- Version 7.4.2.2StatusaffectedConstraints-
- Version 7.4.2.3StatusaffectedConstraints-
- Version 7.4.2.4StatusaffectedConstraints-
- Version 7.4.3StatusaffectedConstraints-
- Version 7.4.4StatusaffectedConstraints-
- Version 7.4.7StatusaffectedConstraints-
- Version 7.6.0StatusaffectedConstraints-
- Version 7.6.1StatusaffectedConstraints-
- Version 7.6.2StatusaffectedConstraints-
- Version 7.6.2.1StatusaffectedConstraints-
- Version 7.6.4StatusaffectedConstraints-
- Version 7.7.0StatusaffectedConstraints-
- Version 7.7.10StatusaffectedConstraints-
- Version 7.7.10.1StatusaffectedConstraints-
- Version 7.7.11StatusaffectedConstraints-
- Version
Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
| Vendor | Product | Default status | Versions | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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| Cisco | Cisco Secure Firewall Adaptive Security Appliance (ASA) Software | n/a |
| ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Cisco | Cisco Secure Firewall Management Center (FMC) | n/a |
| ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Cisco | Cisco Secure Firewall Threat Defense (FTD) Software | n/a |
|
No data.
No data.
No Red Hat product state for this CVE.
No package ranges for this CVE.
Remediation
No remediation recorded yet.
Metrics
No CVSS v4.0 score for this CVE.
9.6 CRITICAL CVE.org
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:L
Attack Vector Adjacent
Attack Complexity Low
Privileges Required None
User Interaction None
Scope Changed
Confidentiality Impact High
Integrity Impact High
Availability Impact Low
No CVSS v3.0 score for this CVE.
No CVSS v2.0 score for this CVE.
This CVE is not in the KEV list.
CISA SSVC (Vulnrichment)
Stakeholder-Specific Vulnerability Categorization from CISA ADP.
Exploitation
NoneAutomatable
NoTechnical Impact
TotalDecision
n/aAssessed Sep 16, 2026 · SSVC 2.0.3
0.23% 0.00229
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 1, 2026.
EPSS probability 0.00229
Score over time
Sep–Oct 2026- EPSS v5
Percentile over time
- EPSS v5
Table of values (2 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 0.23% (0.00229) | 12.43th | v5 (v2026.06.15) |
| Sep 17, 2026 | 0.23% (0.00229) | 13.92th | v5 (v2026.06.15) |
Weaknesses (1)
References (1)
Change history (0)
No recorded changes yet.
Sources
CVE.org / MITRE
Status PUBLISHED
Assigner cisco
Published Sep 16, 2026
Updated Sep 18, 2026
Reserved Oct 8, 2025
Link CVE-2026-20331
CISA Vulnrichment
Updated Sep 16, 2026