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CVE-2026-20334

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

Published: Sep 16, 2026Updated: Sep 18, 2026 Sources: CVE List NVDCWE-710
8.4HIGH
NVD MITRE
EPSS Score
0.3%
Top 81.4%
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-2026-20334 are related to issues concerning improper adherence to coding standards that are grouped under the Common Weakness Enumeration (CWE) Pillar CWE-710.

In plain language

AI Act now

If you run Cisco Secure Adaptive Security Appliance (ASA) Software, Cisco Secure Firewall Threat Defense (FTD) Software, or Cisco Secure Firewall Management Center (FMC), this high-severity issue needs prompt attention, but Cisco has not published affected versions or a patch.

Executive summary

CVE-2026-20334 is a high-severity, network-reachable set of coding-standards weaknesses in Cisco ASA, FTD, and FMC that requires high privileges and user interaction, with public exploit code available.

If affected, business impact
Firewall configuration tamperingSecurity-management disruptionSensitive data exposureNetwork control lossService interruption

What to do now

  1. Ask your IT provider or Cisco support to confirm whether your installed Cisco ASA, FTD, or FMC release is affected by CVE-2026-20334.
  2. Limit high-privilege administrator accounts to essential staff and review recent administrator activity.
  3. Watch Cisco's security advisories for the fixed version; no fixed version or patch is currently available.
  4. Have your IT provider apply Cisco's update or mitigation guidance as soon as Cisco publishes it.
May need vendor / contractor work

CVSS Vector Breakdown

AV:NAC:LPR:HUI:RS:CC:HI:HA:H
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:HPrivileges Required
High
UI:RUser Interaction
Required
Scope
S:CScope
Changed
Impact
C:HConfidentiality
High
I:HIntegrity
High
A:HAvailability
High
Open in CVSS calculator →

Weaknesses

CWE-710

Affected Products

Cisco
commercial·USaka cisco systems, cisco systems inc.
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-2026-20334?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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