CVE-2025-5462
📋 TL;DR
A heap-based buffer overflow vulnerability in Ivanti secure access products allows remote unauthenticated attackers to trigger denial of service. This affects Ivanti Connect Secure, Policy Secure, ZTA Gateway, and Neurons for Secure Access. Organizations using affected versions are vulnerable to service disruption.
💻 Affected Systems
- Ivanti Connect Secure
- Ivanti Policy Secure
- Ivanti ZTA Gateway
- Ivanti Neurons for Secure Access
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete service disruption of affected Ivanti gateways, potentially affecting all secure remote access for an organization
Likely Case
Denial of service causing temporary unavailability of secure access services
If Mitigated
Limited impact with proper network segmentation and monitoring in place
🎯 Exploit Status
Remote unauthenticated exploitation is possible but requires specific conditions to trigger the buffer overflow
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Connect Secure 22.7R2.8 or 22.8R2, Policy Secure 22.7R1.5, ZTA Gateway 22.8R2.3-723, Neurons for Secure Access 22.8R1.4
Vendor Advisory: https://forums.ivanti.com/s/article/August-Security-Advisory-Ivanti-Connect-Secure-Policy-Secure-ZTA-Gateways-Multiple-CVEs?language=en_US
Restart Required: Yes
Instructions:
1. Download the appropriate patch from Ivanti support portal. 2. Backup current configuration. 3. Apply patch via Ivanti management interface. 4. Restart the appliance. 5. Verify service functionality.
🔧 Temporary Workarounds
Network Segmentation
allRestrict network access to affected Ivanti appliances to trusted IP ranges only
Rate Limiting
allImplement rate limiting on network traffic to Ivanti appliances to reduce DoS impact
🧯 If You Can't Patch
- Implement strict network access controls to limit exposure
- Deploy additional monitoring and alerting for DoS conditions
🔍 How to Verify
Check if Vulnerable:
Check appliance version in Ivanti management interface against affected version rangesCheck Version:
ssh admin@ivanti-appliance 'show version' or check via web admin interfaceVerify Fix Applied:
Verify version number shows patched version and monitor for service stability📡 Detection & Monitoring
Log Indicators:
- Unusual traffic patterns
- Service restart events
- Memory allocation errors in system logs
Network Indicators:
- Abnormal traffic spikes to Ivanti appliances
- Connection attempts from unexpected sources
SIEM Query:
source="ivanti*" AND (event_type="service_restart" OR error="memory" OR error="buffer")