CVE-2026-20324

Cisco Secure Firewall Management Center sftunnel Root Arbitrary Code Exectution Vulnerability

Published Sep 16, 2026 CVSS 3.1 · 9.9 Critical EPSS < 1% KEV · Not listed

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.

Affected Products

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions

Cisco

Cisco Secure Firewall Management Center (FMC)

unknown

Version	Status	Constraints
`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	—
`7.2.0.1`	affected	—
`7.0.4`	affected	—
`7.2.1`	affected	—
`7.0.5`	affected	—
`7.3.0`	affected	—
`7.2.2`	affected	—
`7.3.1`	affected	—
`7.2.3`	affected	—
`7.2.3.1`	affected	—
`7.2.4`	affected	—
`7.0.6`	affected	—
`7.2.4.1`	affected	—
`7.2.5`	affected	—
`7.3.1.1`	affected	—
`7.4.0`	affected	—
`7.0.6.1`	affected	—
`7.2.5.1`	affected	—
`7.4.1`	affected	—
`7.2.6`	affected	—
`7.4.1.1`	affected	—
`7.0.6.2`	affected	—
`7.2.7`	affected	—
`7.2.5.2`	affected	—
`7.3.1.2`	affected	—
`7.2.8`	affected	—
`7.6.0`	affected	—
`7.4.2`	affected	—
`7.2.8.1`	affected	—
`7.0.6.3`	affected	—
`7.4.2.1`	affected	—
`7.2.9`	affected	—
`7.0.7`	affected	—
`7.7.0`	affected	—
`7.4.2.2`	affected	—
`7.2.10`	affected	—
`7.6.1`	affected	—
`7.4.2.3`	affected	—
`7.0.8`	affected	—
`7.6.2`	affected	—
`7.7.10`	affected	—
`7.2.10.1`	affected	—
`7.0.8.1`	affected	—
`7.6.2.1`	affected	—
`7.2.10.2`	affected	—
`7.7.10.1`	affected	—
`7.4.2.4`	affected	—
`7.4.3`	affected	—
`7.6.3`	affected	—
`7.7.11`	affected	—
`7.6.4`	affected	—
`10.0.0`	affected	—
`7.4.4`	affected	—
`7.4.5`	affected	—
`7.0.9`	affected	—
`7.2.11`	affected	—
`7.7.12`	affected	—
`7.6.5`	affected	—
`7.4.6`	affected	—
`10.0.1`	affected	—
`7.4.7`	affected	—

No data.

Vendor Product Versions

Cisco

Secure Firewall Management Center

Version	Status	Scheme	Platform
`7.0.0`	affected	semver	—
`7.0.0.1`	affected	generic	—
`7.0.1`	affected	semver	—
`7.0.1.1`	affected	generic	—
`7.0.2`	affected	semver	—
`7.2.0`	affected	semver	—
`7.0.2.1`	affected	generic	—
`7.0.3`	affected	semver	—
`7.2.0.1`	affected	generic	—
`7.0.4`	affected	semver	—
`7.2.1`	affected	semver	—
`7.0.5`	affected	semver	—
`7.3.0`	affected	semver	—
`7.2.2`	affected	semver	—
`7.3.1`	affected	semver	—
`7.2.3`	affected	semver	—
`7.2.3.1`	affected	generic	—
`7.2.4`	affected	semver	—
`7.0.6`	affected	semver	—
`7.2.4.1`	affected	generic	—
`7.2.5`	affected	semver	—
`7.3.1.1`	affected	generic	—
`7.4.0`	affected	semver	—
`7.0.6.1`	affected	generic	—
`7.2.5.1`	affected	generic	—
`7.4.1`	affected	semver	—
`7.2.6`	affected	semver	—
`7.4.1.1`	affected	generic	—
`7.0.6.2`	affected	generic	—
`7.2.7`	affected	semver	—
`7.2.5.2`	affected	generic	—
`7.3.1.2`	affected	generic	—
`7.2.8`	affected	semver	—
`7.6.0`	affected	semver	—
`7.4.2`	affected	semver	—
`7.2.8.1`	affected	generic	—
`7.0.6.3`	affected	generic	—
`7.4.2.1`	affected	generic	—
`7.2.9`	affected	semver	—
`7.0.7`	affected	semver	—
`7.7.0`	affected	semver	—
`7.4.2.2`	affected	generic	—
`7.2.10`	affected	semver	—
`7.6.1`	affected	semver	—
`7.4.2.3`	affected	generic	—
`7.0.8`	affected	semver	—
`7.6.2`	affected	semver	—
`7.7.10`	affected	semver	—
`7.2.10.1`	affected	generic	—
`7.0.8.1`	affected	generic	—
`7.6.2.1`	affected	generic	—
`7.2.10.2`	affected	generic	—
`7.7.10.1`	affected	generic	—
`7.4.2.4`	affected	generic	—
`7.4.3`	affected	semver	—
`7.6.3`	affected	semver	—
`7.7.11`	affected	semver	—
`7.6.4`	affected	semver	—
`10.0.0`	affected	semver	—
`7.4.4`	affected	semver	—
`7.4.5`	affected	semver	—
`7.0.9`	affected	semver	—
`7.2.11`	affected	semver	—
`7.7.12`	affected	semver	—
`7.6.5`	affected	semver	—
`7.4.6`	affected	semver	—
`10.0.1`	affected	semver	—
`7.4.7`	affected	semver	—

Remediation

No solution or workaround provided in the CVE record

Tracking

Advisories

No advisories available

Metrics

No CVSS v4.0

Attack Vector Network

Attack Complexity Low

Privileges Required Low

Scope Changed

Confidentiality Impact High

Integrity Impact High

Availability Impact High

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

Exploit prediction score: < 1% (0.625% probability within 30 days)

Exploitation none

Automatable no

Technical Impact total

References

Link	Providers
https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-fmc-sftunn-codex-c3O4Jft2

History

Sep 19, 2026 11:00 PM First appearance in the feed. Affected vendors updated View changes

Type	Values Removed	Values Added
First Time appeared		Cisco Cisco secure Firewall Management Center
Vendors & Products		Cisco Cisco secure Firewall Management Center

Sep 17, 2026 5:30 PM Scoring metrics updated View changes

Type	Values Removed	Values Added
Metrics		ssvc `{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}`

Sep 16, 2026 8:15 PM Description updated. Title updated. Weaknesses updated. Added references. Scoring metrics updated View changes

Type	Values Removed	Values Added
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.
Title		Cisco Secure Firewall Management Center sftunnel Root Arbitrary Code Exectution Vulnerability
Weaknesses		CWE-862
References		https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-fmc-sftunn-codex-c3O4Jft2
Metrics		cvssV3_1 `{'score': 9.9, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H'}`