OCTOBER 13, 2026
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Case File

CVE-2026-20340

HIGH · CVSS 8.8 EPSS 0.69% Public Exploit

Source: NVD + CISA KEV + EPSS · Published 2026-09-16 · Last synced 2026-10-13

CyberRota Analysis

AI-Generated

Cisco Secure FMC Software is vulnerable due to unsecured deserialization of user-controlled data, allowing authenticated remote attackers to execute arbitrary commands with root privileges. By sending a specially crafted HTTP payload, an attacker with at least Security Analyst role credentials can exploit this flaw, potentially compromising the underlying operating system. Organizations using Cisco Secure FMC Software should prioritize remediation to mitigate the risk of unauthorized command execution.

Public Exploit Signal

A public exploit, PoC, GitHub repository or Metasploit reference was detected for this CVE.

Detected Signals
exploit

Note: these links are listed for security research and verification purposes only.

CVE
CVE-2026-20340
Severity
HIGH
CVSS
8.8
EPSS
0.69%
Cisco

Original NVD Description

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).