CVE-2024-41727
📋 TL;DR
This vulnerability affects BIG-IP tenants on specific hardware and virtual editions using Intel E810 SR-IOV NICs, where undisclosed traffic patterns can cause excessive memory consumption. This could lead to performance degradation or denial of service conditions. Only BIG-IP deployments on r2000/r4000 series hardware or VEs with Intel E810 SR-IOV NICs are affected.
💻 Affected Systems
- BIG-IP tenants on r2000 series hardware
- BIG-IP tenants on r4000 series hardware
- BIG-IP Virtual Edition with Intel E810 SR-IOV NIC
📦 What is this software?
Big Ip Advanced Web Application Firewall by F5
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Big Ip Advanced Web Application Firewall by F5
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Big Ip Advanced Web Application Firewall by F5
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Big Ip Application Acceleration Manager by F5
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Big Ip Application Acceleration Manager by F5
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Big Ip Application Acceleration Manager by F5
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Big Ip Application Security Manager by F5
View all CVEs affecting Big Ip Application Security Manager →
Big Ip Application Security Manager by F5
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Big Ip Application Security Manager by F5
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Big Ip Application Visibility And Reporting by F5
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Big Ip Application Visibility And Reporting by F5
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⚠️ Risk & Real-World Impact
Worst Case
Complete system unavailability due to memory exhaustion causing denial of service for all network traffic processing.
Likely Case
Performance degradation and intermittent service disruptions as memory resources become constrained.
If Mitigated
Minimal impact with proper traffic filtering and monitoring in place to detect abnormal memory usage patterns.
🎯 Exploit Status
Exploitation requires sending specific traffic patterns to vulnerable systems, but exact details are undisclosed.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check F5 advisory K000138833 for specific fixed versions
Vendor Advisory: https://my.f5.com/manage/s/article/K000138833
Restart Required: Yes
Instructions:
1. Review F5 advisory K000138833 for affected versions. 2. Download and apply the appropriate patch from F5 Downloads. 3. Schedule maintenance window for system restart. 4. Verify patch application and monitor system performance.
🔧 Temporary Workarounds
Traffic Filtering
allImplement network filtering to block suspicious traffic patterns that could trigger the memory consumption issue.
# Configure iRules or LTM policies to filter traffic
# Example: when CLIENT_ACCEPTED { if {[IP::addr [IP::client_addr] equals 10.0.0.0/8]} { reject } }
Resource Monitoring
allImplement enhanced monitoring of memory utilization with alerting thresholds.
# Monitor memory usage via SNMP or REST API
# Example: snmpwalk -v2c -c public <bigip_ip> 1.3.6.1.4.1.3375.2.1.1.2.1.44
🧯 If You Can't Patch
- Implement strict network segmentation to isolate vulnerable systems from untrusted networks
- Deploy rate limiting and traffic shaping to prevent excessive traffic to vulnerable interfaces
🔍 How to Verify
Check if Vulnerable:
Check hardware model and NIC configuration via CLI: 'tmsh show sys hardware' and verify if using Intel E810 SR-IOV NICs on r2000/r4000 series or VEs.Check Version:
tmsh show sys versionVerify Fix Applied:
Verify patch version matches fixed versions in F5 advisory and monitor memory utilization for abnormal patterns post-patch.📡 Detection & Monitoring
Log Indicators:
- Abnormal memory utilization spikes in system logs
- High memory consumption alerts in /var/log/ltm
Network Indicators:
- Unusual traffic patterns to BIG-IP interfaces
- Increased packet rates on SR-IOV enabled interfaces
SIEM Query:
source="bigip_logs" ("memory" AND ("high" OR "critical" OR "exhausted")) OR ("SR-IOV" AND "traffic_spike")