OCTOBER 7, 2026
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Case File

CVE-2026-20341

CRITICAL · CVSS 9.1 EPSS 0.45% Public Exploit

Source: NVD + CISA KEV + EPSS · Published 2026-09-16 · Last synced 2026-10-07

CyberRota Analysis

AI-Generated

A critical vulnerability in the sftunnel protocol of Cisco Secure FMC Software allows an authenticated remote attacker to gain root privileges by exploiting unsecured deserialization of untrusted data. This can be achieved through crafted remote procedure calls (RPCs) sent over the management connection, impacting devices running Cisco Secure FMC Software and their high-availability peers. Organizations using this software should prioritize patching to mitigate the risk of unauthorized access and potential system compromise.

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-2026-20341
Severity
CRITICAL
CVSS
9.1
EPSS
0.45%
Cisco

Original NVD Description

A vulnerability in the sftunnel inter-device communication protocol of Cisco Secure FMC Software could allow an authenticated, remote attacker to obtain root privileges. This vulnerability is due to unsecured deserialization of untrusted data over the sftunnel management connection. An attacker could exploit this vulnerability by sending crafted sftunnel remote procedure calls (RPCs). A successful exploit could allow the attacker to gain root privileges on a device that is running Cisco Secure FMC Software and its high-availability peer. To exploit this vulnerability, the attacker must have valid administrative credentials on a managed Cisco FTD device.