CVE-2021-22962
📋 TL;DR
CVE-2021-22962 is a vulnerability in Ivanti Avalanche that allows attackers to send specially crafted requests leading to sensitive data leakage or resource-based denial-of-service attacks. This affects organizations using Ivanti Avalanche enterprise mobility management software.
💻 Affected Systems
- Ivanti Avalanche
📦 What is this software?
Avalanche by Ivanti
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise with sensitive data exfiltration and sustained denial-of-service rendering the Avalanche server unusable.
Likely Case
Information disclosure of sensitive configuration data and temporary service disruption through resource exhaustion.
If Mitigated
Limited impact with proper network segmentation and request filtering in place.
🎯 Exploit Status
The vulnerability requires sending crafted requests but does not require authentication.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 6.4.2
Vendor Advisory: https://download.wavelink.com/Files/avalanche_v6.4.2_release_notes.txt
Restart Required: Yes
Instructions:
1. Download Avalanche 6.4.2 from Ivanti portal. 2. Backup current configuration. 3. Run installer with administrative privileges. 4. Restart the Avalanche server service.
🔧 Temporary Workarounds
Network Segmentation
allRestrict access to Avalanche web interface to trusted networks only.
Configure firewall rules to limit access to Avalanche server IP/port
Request Filtering
allImplement WAF rules to block suspicious requests to Avalanche endpoints.
Add WAF rules for pattern matching on Avalanche-specific attack vectors
🧯 If You Can't Patch
- Implement strict network access controls to limit exposure
- Monitor Avalanche server logs for unusual request patterns and resource consumption
🔍 How to Verify
Check if Vulnerable:
Check Avalanche version in Administration Console under System Information.Check Version:
In Avalanche console: Navigate to Administration > System InformationVerify Fix Applied:
Verify version shows 6.4.2 or later after patching.📡 Detection & Monitoring
Log Indicators:
- Unusual request patterns to Avalanche web endpoints
- High resource consumption alerts
- Multiple failed or malformed requests
Network Indicators:
- Unusual traffic spikes to Avalanche server port (typically 8080/8443)
- Requests with abnormal payload sizes or patterns
SIEM Query:
source="avalanche.log" AND (message="*malformed*" OR message="*resource*exhaustion*")