CVE-2024-40765
📋 TL;DR
An integer-based buffer overflow vulnerability in SonicOS IPSec implementation allows remote attackers to cause denial of service or potentially execute arbitrary code by sending specially crafted IKEv2 payloads. This affects SonicWall firewalls with IPSec VPN enabled, potentially exposing organizations to remote compromise.
💻 Affected Systems
- SonicWall firewalls with SonicOS
⚠️ 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
Remote code execution leading to complete system compromise, lateral movement within network, data exfiltration, and persistent backdoor installation.
Likely Case
Denial of service causing VPN service disruption, firewall instability, and potential system crashes requiring manual intervention.
If Mitigated
Limited service disruption with proper network segmentation and IPSec hardening, preventing code execution.
🎯 Exploit Status
Exploitation requires specific IKEv2 payload crafting and network access to IPSec service.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check SonicWall advisory SNWLID-2024-0013 for specific patched versions
Vendor Advisory: https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2024-0013
Restart Required: Yes
Instructions:
1. Access SonicWall management interface. 2. Check current SonicOS version. 3. Download latest firmware from SonicWall support portal. 4. Apply firmware update following vendor documentation. 5. Reboot firewall to complete installation.
🔧 Temporary Workarounds
Disable IPSec VPN
allTemporarily disable IPSec VPN services if not required, eliminating attack surface.
Restrict IPSec Access
allImplement network ACLs to limit IPSec access to trusted IP addresses only.
🧯 If You Can't Patch
- Implement strict network segmentation to isolate IPSec services from critical assets
- Deploy intrusion prevention systems with signatures for IKEv2 protocol anomalies
🔍 How to Verify
Check if Vulnerable:
Check SonicOS version against SonicWall advisory SNWLID-2024-0013. Verify if IPSec VPN is enabled in configuration.Check Version:
Log into SonicWall management interface and navigate to System > Status to view firmware versionVerify Fix Applied:
Confirm SonicOS version is updated to patched version listed in advisory. Verify IPSec service is running without issues.📡 Detection & Monitoring
Log Indicators:
- Unusual IKEv2 negotiation failures
- IPSec service crashes or restarts
- Buffer overflow warnings in system logs
Network Indicators:
- Malformed IKEv2 packets to UDP port 500 or 4500
- Unusual spike in IPSec connection attempts
SIEM Query:
source="sonicwall" AND (event_type="crash" OR message="*buffer*" OR message="*overflow*")