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CVE-2026-20324— Cisco Secure Firewall Management Center sftunnel Root Arbitrary Code Exectution Vulnerability

Quick assessment

Affected

Cisco Cisco Secure Firewall Management Center (FMC)

Exploitation

No confirmed in-the-wild exploitation; assess based on exposure

Recommended action

Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Cisco 安全防火墙管理中心（FMC）软件中设备间通信协议存在一个漏洞，可能允许经过身份验证的远程攻击者以 root 权限执行任意命令。该漏洞的产生原因是：已注册的 sftunnel 对等节点（peer）拥有错误的权限，可以将任意文件写入设备的任意位置。攻击者可以通过劫持 sftunnel 通信连接，或作为合法的已注册 sftunnel 对等节点，发送 sftunnel 命令，从而将恶意文件写入受影响设备的磁盘。成功利用此漏洞后，攻击者可以将一个以 root 权限执行的文件写入设备。利用该漏洞要求攻击者在受影

CVSS 9.9 · Critical EPSS 0.62% · P50 Updated Sep 18, 2026

Possible ATT&CK Techniques 3 AI

T1059 · Command and Scripting Interpreter T1083 · File and Directory Discovery T1078 · Valid Accounts

Affected Version Matrix 68

Vendor	Product	Version Range	Status
Cisco	Cisco Secure Firewall Management Center (FMC)	`7.0.0`	affected
		`7.0.0.1`	affected
		`7.0.1`	affected
		`7.0.1.1`	affected
		`7.0.2`	affected
		`7.2.0`	affected
		`7.0.2.1`	affected
		`7.0.3`	affected
… +60 more rows

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Vulnerability Information

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Vulnerability Title

Cisco Secure Firewall Management Center sftunnel Root Arbitrary Code Exectution Vulnerability

Source: CVE Program / CVE List V5

Vulnerability Description

A vulnerability in the sftunnel inter-device communication protocol of Cisco Secure Firewall Management Center (FMC) Software could allow an authenticated, remote attacker to execute arbitrary commands as root. This vulnerability exists because a registered sftunnel peer has incorrect permissions to write an arbitrary file to any location on the device. An attacker could exploit this vulnerability by hijacking the sftunnel communication connection or being a valid registered sftunnel peer and sending an sftunnel command to write a malicious file to the disk of an affected device. A successful exploit could allow the attacker to write a file to the device that is executed with root privileges. To exploit this vulnerability, the attacker must have valid user credentials on the affected device.

Source: CVE Program / CVE List V5

CVSS Information

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

Source: CVE Program / CVE List V5

Vulnerability Type

授权机制缺失

Source: CVE Program / CVE List V5

Affected Products

Vendor	Product	Affected Versions	CPE	Subscribe
Cisco	Cisco Secure Firewall Management Center (FMC)	7.0.0	-

II. Public POCs for CVE-2026-20324

#	POC Description	Source Link	Shenlong Link

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III. Intelligence Information for CVE-2026-20324

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Vendor Advisories for CVE-2026-20324 (1)

🔗 Cisco Secure Firewall Management Center Software sftunnel Root Arbitrary Code Execution Vulnerability Read full article

https://www.cve.org/CVERecord?id=CVE-2026-20324

Same Patch Batch · Cisco · 2026-09-16 · 79 CVEs total

CVE-2026-76460	10.0 CRITICAL	Cisco Identity Services Engine Authentication Bypass Vulnerability
CVE-2026-76423	10.0 CRITICAL	Cisco ISE API Authentication Bypass Vulnerability
CVE-2026-20130	10.0 CRITICAL	Cisco Identity Services Engine Hardening Release - Improper Neutralization Vulnerabilities
CVE-2026-20192	10.0 CRITICAL	Cisco Identity Services Engine Hardening Release - Access Control Vulnerabilities
CVE-2026-20332	9.9 CRITICAL	Cisco Secure Adaptive Security Appliance Software, Secure Firewall Threat Defense Software
CVE-2026-20330	9.9 CRITICAL	Cisco Secure Adaptive Security Appliance Software, Secure Firewall Threat Defense Software
CVE-2026-20322	9.9 CRITICAL	Cisco Nexus Dashboard Software Security Hardening Release September 2026 - Improper Access
CVE-2026-20234	9.9 CRITICAL	Cisco Identity Services Engine Hardening Release - Insuffiencently Protected Credential Vu
CVE-2026-20329	9.9 CRITICAL	Cisco Secure Adaptive Security Appliance Software, Secure Firewall Threat Defense Software
CVE-2026-20325	9.9 CRITICAL	Cisco Nexus Dashboard Software Security Hardening Release September 2026 - Improper Neutra
CVE-2026-20307	9.9 CRITICAL	Cisco Identity Services Engine Remote Code Execution Vulnerability
CVE-2026-20242	9.8 CRITICAL	Cisco Secure Firewall Management Center Software Java Deserialization Remote Code Executio
CVE-2026-20326	9.8 CRITICAL	Cisco Nexus Dashboard Software Security Hardening Release September 2026 - Missing Authent
CVE-2026-20331	9.6 CRITICAL	Cisco Secure Adaptive Security Appliance Software, Secure Firewall Threat Defense Software
CVE-2026-20306	9.1 CRITICAL	Cisco Identity Services Engine Command Injection Vulnerability
CVE-2026-20305	9.1 CRITICAL	Cisco Identity Services Engine Command Injection Vulnerability
CVE-2026-20284	9.1 CRITICAL	Cisco Identity Search Engine SXP REST API SQL Injection Vulnerability
CVE-2026-20176	9.1 CRITICAL	Cisco Identity Services Engine Remote Code Execution Vulnerability
CVE-2026-20341	9.1 CRITICAL	Cisco Secure Firewall Management Center Software sftunnel Deserialization Root Command Exe
CVE-2026-20211	9.1 CRITICAL	Cisco Identity Services Engine Remote Code Execution Vulnerability

Showing top 20 of 79 CVEs. View all on vendor page → →

IV. Related Vulnerabilities

Same product: Cisco Secure Firewall Management Center (FMC)

Same vendor: Cisco

Same weakness: CWE-862