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CVE-2026-20330

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

Published: Sep 16, 2026Updated: Sep 18, 2026 Sources: CVE List NVDCWE-707
9.9CRITICAL
NVD MITRE
EPSS Score
0.3%
Top 72.9%
CISA KEV
Not in KEV
Exploits
0 Known
Remediation
No Fix Available
Self-Check
Not available

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-2026-20330 are related to improper neutralization issues that are grouped under the Common Weakness Enumeration (CWE) Pillar CWE-707.

In plain language

AI Act now

This is a critical security flaw in Cisco Secure Firewall ASA, FTD, and FMC software with a public exploit available, so affected businesses should act now even though Cisco has not published a fix.

Executive summary

CVE-2026-20330 is a CVSS 9.9 improper-neutralization issue (CWE-707) in Cisco Secure Firewall ASA, FTD, and FMC software that a logged-in attacker may exploit to compromise confidentiality, integrity, and availability across a security boundary.

If affected, business impact
Firewall administration takeoverNetwork security policy changesSensitive data exposureService disruptionRansomware enablement

What to do now

  1. Check whether you run cisco secure firewall adaptive security appliance (asa) software, cisco secure firewall threat defense (ftd) software, or cisco secure firewall management center (fmc), and record each installed version.
  2. Treat every deployed version as potentially affected until Cisco publishes affected-version details; no fixed version is currently available.
  3. Restrict administrative access to trusted staff and networks, review administrator accounts, and remove any accounts that are no longer needed.
  4. Ask your Cisco support contact for the hardening release or mitigation guidance for CVE-2026-20330, then schedule its deployment promptly.
May need vendor / contractor work

CVSS Vector Breakdown

AV:NAC:LPR:LUI:NS:CC:HI:HA:H
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:LPrivileges Required
Low
UI:NUser Interaction
None
Scope
S:CScope
Changed
Impact
C:HConfidentiality
High
I:HIntegrity
High
A:HAvailability
High
Open in CVSS calculator →

Weaknesses

CWE-707

Affected Products

Cisco
commercial·USaka cisco systems inc., cisco systems
Cisco Secure Firewall Adaptive Security Appliance (ASA) Software
Networking Infrastructure
Cisco Secure Firewall Management Center (FMC)
Networking Infrastructure
Cisco Secure Firewall Threat Defense (FTD) Software
Networking Infrastructure

Exploitability

0 exploit sources identified

Exploit details including PoC links, Metasploit modules, and scanner templates are available after registration.

View exploit details
Is your org exposed to CVE-2026-20330?Request an assessment to establish which checks are appropriate for your systems. Check my exposure

References

https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-hardening-asaftdfmc-uvpPROhN
sec.cloudapps.cisco.com
News mentions
1

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