CVE-2026-2507
📋 TL;DR
A vulnerability in BIG-IP AFM or BIG-IP DDoS modules causes the Traffic Management Microkernel (TMM) to terminate when processing specific undisclosed traffic. This affects F5 BIG-IP systems with AFM or DDoS modules provisioned, potentially causing denial of service. Systems running software versions that have reached End of Technical Support are not evaluated but may still be vulnerable.
💻 Affected Systems
- F5 BIG-IP with AFM module
- F5 BIG-IP with DDoS module
⚠️ Manual Verification Required
This CVE does not have specific version information in our database, so automatic vulnerability detection cannot determine if your system is affected.
Why? The CVE database entry doesn't specify which versions are vulnerable (no version ranges provided by the vendor/NVD).
🔒 Custom verification scripts are available for registered users. Sign up free to download automated test scripts.
- Review the CVE details at NVD
- Check vendor security advisories for your specific version
- Test if the vulnerability is exploitable in your environment
- Consider updating to the latest version as a precaution
⚠️ Risk & Real-World Impact
Worst Case
Complete service disruption as TMM termination causes all traffic processing to stop, leading to extended downtime until manual intervention restores services.
Likely Case
Intermittent service outages as TMM restarts automatically but causes traffic disruption during restart cycles, potentially leading to degraded performance.
If Mitigated
Minimal impact with proper network segmentation and traffic filtering preventing malicious packets from reaching vulnerable systems.
🎯 Exploit Status
Exploitation requires sending specific network traffic to vulnerable systems. The exact traffic pattern is undisclosed but appears to be network-based and unauthenticated.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Refer to F5 advisory K000160003 for specific fixed versions per BIG-IP release
Vendor Advisory: https://my.f5.com/manage/s/article/K000160003
Restart Required: Yes
Instructions:
1. Review F5 advisory K000160003. 2. Identify applicable fixed version for your BIG-IP release. 3. Schedule maintenance window. 4. Backup configuration. 5. Apply patch/upgrade. 6. Restart TMM services. 7. Verify functionality.
🔧 Temporary Workarounds
Traffic Filtering
allImplement network-level filtering to block suspicious traffic patterns that might trigger the vulnerability
# Use external firewall or upstream filtering devices
# Configure ACLs to limit traffic to necessary sources/destinations
Module Disablement
linuxTemporarily disable AFM or DDoS modules if not critically required
tmsh modify sys provision afm level none
tmsh modify sys provision dos level none
🧯 If You Can't Patch
- Implement strict network segmentation to isolate vulnerable systems from untrusted networks
- Deploy intrusion prevention systems with DDoS protection capabilities to filter malicious traffic
🔍 How to Verify
Check if Vulnerable:
Check if AFM or DDoS modules are provisioned: tmsh show sys provision | grep -E '(afm|dos)'Check Version:
tmsh show sys versionVerify Fix Applied:
Verify version is patched: tmsh show sys version | grep -i version, then compare with fixed versions in K000160003📡 Detection & Monitoring
Log Indicators:
- TMM process termination/restart events in /var/log/ltm
- Unexpected service restarts in system logs
- High availability failover events
Network Indicators:
- Sudden traffic drops to BIG-IP services
- Increased retransmission rates from clients
- Connection timeouts to BIG-IP managed services
SIEM Query:
source="*/var/log/ltm*" AND ("TMM terminated" OR "TMM restarting" OR "unexpected termination")