Critical [CVE-2026-20340 +4] Cisco Secure Firewall Management Center Software Vulnerabilities
This critical-severity Cisco advisory covers CVE-2026-20340 and CVE-2026-20341 and 3 more CVEs affecting Secure Firewall Management Center (FMC) Appliances.
Aggregated and source-linked by VulniPulse. Data sources, validation and limitations. This bulletin covers 5 CVEs; its score, affected versions and guidance may apply to different issues within that bulletin.
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Summary
Multiple vulnerabilities in Cisco Secure Firewall Management Center (FMC) Software could allow a remote attacker to gain root access, download sensitive files, perform a SQL injection attack, or cause a denial of service (DoS) condition.
For more information about these vulnerabilities, see the Details section of this advisory.
Cisco has released software updates that address these vulnerabilities. There are no workarounds that address these vulnerabilities.
This advisory is part of a group of advisories. For a complete list of the advisories and links to them, see Cisco Advance Notification for Publication of September 16, 2026, Security Advisories.
In addition, for further documentation of improvements and fixes in Cisco Secure Firewall products, see Cisco Secure Firewall Adaptive Security Appliance Software, Secure Firewall Threat Defense Software, and Secure Firewall Management Center Software Hardening Release: September 2026.
Affected product named by the advisory: Secure Firewall Management Center (FMC) Appliances.
- Scope: CVE-2026-20341: This vulnerability affects Cisco Secure FMC Software, regardless of device configuration. The attacker must have root access on a managed Cisco Firepower Threat Defense (FTD) device.
Official advisory · high-confidence parse· fetched 12 days ago·verify at source
Fixed versions
No fixed release is recorded yet. That does not prove no patch exists — confirm against the vendor advisory.
Official advisory · high-confidence parse· fetched 12 days ago·verify at source
Mitigation checklist
- There are no workarounds that address these vulnerabilities.
Official advisory · high-confidence parse· fetched 12 days ago·verify at source
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