A vulnerability in the sftunnel inter-device communication protocol of Cisco Secure Firewall Management Center (FMC) Software could allow an… (CVE-2026-20324)
CVE-2026-20324 is a critical vulnerability in the sftunnel inter-device communication protocol of Cisco Secure Firewall Management Center (FMC) Software. It allows an authenticated remote attacker with valid user credentials to execute arbitrary commands as root by exploiting improper file write permissions. The attacker can hijack or act as a registered sftunnel peer to write and execute malicious files with root privileges on the affected device.
AI Analysis
Technical Summary
This vulnerability arises because a registered sftunnel peer has incorrect permissions that allow writing arbitrary files to any location on the device. An attacker with valid credentials can exploit this by sending a malicious sftunnel command to write a file that is executed with root privileges, leading to full system compromise. Exploitation requires authentication and leverages the sftunnel communication channel within Cisco Secure Firewall Management Center (FMC) Software.
Potential Impact
Successful exploitation results in arbitrary command execution as root, compromising confidentiality, integrity, and availability of the affected system. This can lead to full system takeover by an attacker with valid credentials.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until a patch is available, restrict access to valid user credentials and monitor for unauthorized sftunnel communication. Follow Cisco's official guidance once published.
A vulnerability in the sftunnel inter-device communication protocol of Cisco Secure Firewall Management Center (FMC) Software could allow an… (CVE-2026-20324)
Description
CVE-2026-20324 is a critical vulnerability in the sftunnel inter-device communication protocol of Cisco Secure Firewall Management Center (FMC) Software. It allows an authenticated remote attacker with valid user credentials to execute arbitrary commands as root by exploiting improper file write permissions. The attacker can hijack or act as a registered sftunnel peer to write and execute malicious files with root privileges on the affected device.
CVSS v3.1
Score 9.9critical
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability arises because a registered sftunnel peer has incorrect permissions that allow writing arbitrary files to any location on the device. An attacker with valid credentials can exploit this by sending a malicious sftunnel command to write a file that is executed with root privileges, leading to full system compromise. Exploitation requires authentication and leverages the sftunnel communication channel within Cisco Secure Firewall Management Center (FMC) Software.
Potential Impact
Successful exploitation results in arbitrary command execution as root, compromising confidentiality, integrity, and availability of the affected system. This can lead to full system takeover by an attacker with valid credentials.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until a patch is available, restrict access to valid user credentials and monitor for unauthorized sftunnel communication. Follow Cisco's official guidance once published.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- GHSA-m3pq-vq89-c8m5
- Osv Schema Version
- 1.4.0
- Aliases
- ["CVE-2026-20324"]
- Database Specific Severity
- CRITICAL
- Cvss Version
- 3.1
- State
- PUBLISHED
Threat ID: 6aab49aa55bf5e2cf599290d
Added to database: 09/17/2026, 02:00:10 UTC
Last enriched: 09/17/2026, 02:41:31 UTC
Last updated: 09/17/2026, 04:01:24 UTC
Views: 3
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