🔐 CVE Alert

CVE-2026-20336

HIGH 8.8

Cisco Secure Adaptive Security Appliance Software, Secure Firewall Threat Defense Software and Secure Firewall Management Center Software Hardening Release - Resource Lifetime Management Vulnerabilities

CVSS Score
8.8
EPSS Score
0.0%
EPSS Percentile
0th

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-2026-20336 are related to issues concerning improper control of a resource through its lifetime that are grouped under the Common Weakness Enumeration (CWE) Pillar CWE-664.

CWE CWE-664
Vendor cisco
Product cisco secure firewall adaptive security appliance (asa) software
Ecosystems
Industries
NetworkingTelecommunications
Published Sep 16, 2026
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CVSS v3 Breakdown

CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack Vector
Adjacent
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

Affected Versions

Cisco / Cisco Secure Firewall Adaptive Security Appliance (ASA) Software
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 9.16.3.15 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 9.16.4.9 9.18.2.8 9.16.4.14 9.18.3 9.16.4.18 9.18.3.39 9.16.4.19 9.18.3.46 9.16.4.27 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 9.18.4 9.20.1.5 9.18.4.5 9.16.4.48 9.18.4.8 9.20.2 9.16.4.55 9.18.4.22 9.20.2.10 9.16.4.57 9.18.4.24 9.20.2.21 9.16.4.61 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 9.16.4.76 9.20.3.9 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 9.23.1.211 9.20.4.235 9.24.1.221 9.22.3.191
Cisco / Cisco Secure Firewall Management Center (FMC)
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 7.3.1 7.2.3 7.2.3.1 7.2.4 7.0.6 7.2.4.1 7.2.5 7.3.1.1 7.4.0 7.0.6.1 7.2.5.1 7.4.1 7.2.6 7.4.1.1 7.0.6.2 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 7.2.10.1 7.0.8.1 7.6.2.1 7.2.10.2 7.7.10.1 7.4.2.4 7.4.3 7.6.3 7.7.11 7.6.4 10.0.0 7.4.4 7.4.5 7.0.9 7.2.11 7.7.12 7.6.5 7.4.6 10.0.1 7.4.7
Cisco / Cisco Secure Firewall Threat Defense (FTD) Software
7.0.0.1 7.0.1 7.0.1.1 7.0.2 7.0.2.1 7.0.3 7.0.4 7.0.5 7.3.0 7.3.1 7.0.6 7.3.1.1 7.4.0 7.0.6.1 7.4.1 7.0.6.2 7.4.1.1 7.3.1.2 7.6.0 7.4.2 7.0.6.3 7.4.2.1 7.0.7 7.7.0 7.4.2.2 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 7.4.3 7.6.4 10.0.0 7.4.4 7.0.9 7.4.7

References

NVD ↗ CVE.org ↗ EPSS Data ↗
sec.cloudapps.cisco.com: https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-hardening-asaftdfmc-uvpPROhN