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.

No CVSS v4.0

Attack Vector Adjacent Network

Attack Complexity Low

Privileges Required None

Scope Unchanged

Confidentiality Impact High

Integrity Impact High

Availability Impact High

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

No EPSS score available.

Key SSVC decision points have not yet been added.

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
Cisco Cisco Secure Firewall Adaptive Security Appliance (ASA) Software unknown
Version Status Constraints
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 —
9.23.1.211 affected —
9.20.4.235 affected —
9.24.1.221 affected —
9.22.3.191 affected —
Cisco Cisco Secure Firewall Management Center (FMC) unknown
Version Status Constraints
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 unknown
Version Status Constraints
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 —

No data.

No data.

No data.

Project Subscriptions

No data.

Advisories

No advisories yet.

Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-hardening-asaftdfmc-uvpPROhN cve-icon cve-icon
History

Wed, 16 Sep 2026 20:30:00 +0000

Type Values Removed Values Added
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-2026-20336 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.
Title Cisco Secure Adaptive Security Appliance Software, Secure Firewall Threat Defense Software and Secure Firewall Management Center Software Hardening Release - Resource Lifetime Management Vulnerabilities
Weaknesses CWE-664
References
Metrics cvssV3_1

{'score': 8.8, 'vector': 'CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H'}

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: cisco

Published:

Updated: 2026-09-16T20:11:44.943Z

Reserved: 2025-10-08T11:59:15.413Z

Link: CVE-2026-20336

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-09-16T21:17:11.350

Modified: 2026-09-16T21:17:11.350

Link: CVE-2026-20336

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

No data.

Weaknesses