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CVE-2026-20333

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

Published: Sep 16, 2026Updated: Sep 18, 2026 Sources: CVE List NVDCWE-697
8.8HIGH
NVD MITRE
EPSS Score
0.3%
Top 75.4%
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-2026-20333 are related to incorrect comparison conditions that are grouped under the Common Weakness Enumeration (CWE) Pillar CWE-697.

In plain language

AI Act now

A serious flaw affects Cisco Secure Firewall ASA, FTD, and FMC software; businesses using these network-reachable systems should act now because a public exploit is available.

Executive summary

CVE-2026-20333 is a CVSS 8.8 incorrect-comparison vulnerability (CWE-697) in Cisco Secure Firewall ASA Software, FTD Software, and FMC that a low-privileged network attacker may use to compromise confidentiality, integrity, and availability.

If affected, business impact
Firewall administration compromiseNetwork security disruptionSensitive data exposureService outages

What to do now

  1. Check whether you run Cisco Secure Firewall ASA Software, Cisco Secure Firewall Threat Defense Software, or Cisco Secure Firewall Management Center Software, and identify every internet-reachable management system.
  2. No fixed version has been published in the provided findings; ask Cisco or your managed IT provider for the vendor's remediation release and deployment timeline.
  3. Until a fix is available, limit management access to trusted administrator networks, remove unnecessary low-level accounts, and review administrator activity for unexpected changes.
May need vendor / contractor work

CVSS Vector Breakdown

AV:NAC:LPR:LUI:NS:UC:HI:HA:H
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:LPrivileges Required
Low
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:HConfidentiality
High
I:HIntegrity
High
A:HAvailability
High
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Weaknesses

CWE-697

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-2026-20333?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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