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Severe, 6 weeks1496Projects326

1496 severe, 6 weeks · 326 projects

CiscoCVE-2026-20340

Cisco Secure Firewall Management Center (FMC): remote code execution

Cisco

CVE-2026-20340 · Published Sep 16, 2026 · updated Sep 18, 2026

High8.8
No fix yet
Cisco advisory

A vulnerability in Cisco Secure FMC Software could allow an authenticated, remote attacker to execute arbitrary commands at the root privilege level.

This vulnerability is due to unsecured deserialization of web-management user-controlled data. An attacker could exploit this vulnerability by authenticating to the device and sending a crafted HTTP payload. A successful exploit could allow the attacker to save the crafted payload and then execute it on the underlying operating system as root.

To exploit this vulnerability, the attacker must have valid credentials for a user account with at least the role of Security Analyst (read-only).

Affected versions

PackageAffectedFixed in
Cisco Secure Firewall Management Center (FMC)
Product
<= 7.0.0No fix yet
<= 7.0.0.1No fix yet
<= 7.0.1No fix yet
<= 7.0.1.1No fix yet
Details and references

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