CVE-2025-31644 is a high-severity command injection vulnerability affecting F5 BIG-IP systems running in Appliance mode. This flaw allows authenticated attackers with administrator privileges to execute arbitrary system commands, potentially bypassing security boundaries and compromising affected devices.
1. Overview of CVE-2025-31644
Key Details
- Vulnerability Type: OS Command Injection (CWE-78)
- CVSS Score: 8.7 (High)
- Affected Component: BIG-IP iControl REST & TMOS Shell (tmsh)
- Impact: Privilege Escalation & Arbitrary Command Execution
- Exploitation Status: No confirmed active exploitation
How It Works
- The vulnerability exists in undisclosed iControl REST and tmsh commands within BIG-IP systems running in Appliance mode.
- Authenticated attackers with administrator privileges can exploit this flaw to execute arbitrary system commands, bypassing security restrictions.
- A successful exploit allows attackers to create or delete files, modify system configurations, and gain unauthorized shell access.
🚨 Important Note: This vulnerability does not affect the data plane—it is a control plane issue only.
2. Affected Products & Versions
Impacted F5 BIG-IP Versions
- BIG-IP Next
- BIG-IP TMOS (Appliance Mode)
- BIG-IQ
Products Not Affected
- F5 Distributed Cloud Services
- NGINX
3. Exploitation & Attack Methods
Potential Attack Scenarios
- Privilege Escalation – Attackers with admin access can bypass Appliance mode restrictions and execute unauthorized shell commands.
- System Manipulation – Exploited systems may allow file creation/deletion, configuration changes, and unauthorized process execution.
- Security Boundary Violation – Attackers can cross security boundaries, potentially affecting network integrity.
Risk Factors
🔹 Appliance mode enforcement depends on specific licensing or vCMP guest settings.
🔹 Network access to iControl REST endpoints increases exposure to exploitation.
4. Mitigation Strategies
A. Apply Security Updates Immediately
✅ F5 has released patches for affected BIG-IP versions. Organizations must upgrade to the latest firmware.
B. Restrict Access to Administrative Interfaces
🔹 Limit access to iControl REST endpoints to trusted IP addresses.
🔹 Disable unnecessary administrative privileges for users.
C. Monitor for Exploitation Attempts
🔸 Deploy Intrusion Detection Systems (IDS) to flag suspicious command execution.
🔸 Audit logs for unexpected administrative actions or unauthorized shell access.
5. Conclusion
CVE-2025-31644 is a critical vulnerability that allows authenticated attackers to execute arbitrary system commands on BIG-IP systems running in Appliance mode. Organizations must apply patches immediately, restrict administrative access, and monitor for signs of exploitation to mitigate risks.
