CVE-2022-21196
📋 TL;DR
This critical vulnerability affects Cambium Networks wireless devices, allowing attackers to bypass authentication on multiple API routes. Unauthorized access can lead to remote code execution, denial-of-service attacks, and sensitive information disclosure. Organizations using affected Cambium MMP, PTP C-series, or PTMP C-series/A5x devices are at risk.
💻 Affected Systems
- Cambium Networks MMP
- Cambium Networks PTP C-series
- Cambium Networks PTMP C-series
- Cambium Networks PTMP A5x
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Full system compromise with remote code execution leading to complete device takeover, network infiltration, and potential lateral movement to other systems.
Likely Case
Unauthorized access to sensitive configuration data, device manipulation, and denial-of-service attacks disrupting wireless connectivity.
If Mitigated
Limited impact with proper network segmentation and access controls, though vulnerable devices remain at risk until patched.
🎯 Exploit Status
Authentication bypass vulnerabilities typically have low exploitation complexity. While no public PoC exists, the vulnerability description suggests straightforward exploitation.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: MMP: v1.0.3, PTP C-series: v2.8.6.1, PTMP C-series and A5x: v2.5.4.1
Vendor Advisory: https://www.cisa.gov/uscert/ics/advisories/icsa-22-034-02
Restart Required: Yes
Instructions:
1. Download appropriate firmware from Cambium Networks support portal. 2. Backup current configuration. 3. Upload and install firmware update via web interface or CLI. 4. Reboot device. 5. Verify firmware version after reboot.
🔧 Temporary Workarounds
Network Segmentation
allIsolate affected devices in separate VLANs with strict firewall rules limiting access to management interfaces.
Access Control Lists
allImplement IP-based restrictions to only allow trusted management stations to access device APIs.
🧯 If You Can't Patch
- Immediately isolate affected devices from internet and critical network segments
- Implement strict network monitoring and alerting for unauthorized access attempts
🔍 How to Verify
Check if Vulnerable:
Check device firmware version via web interface (System > Status) or CLI using 'show version' command and compare against patched versions.Check Version:
show versionVerify Fix Applied:
Confirm firmware version matches or exceeds patched versions: MMP v1.0.3+, PTP C-series v2.8.6.1+, PTMP C-series/A5x v2.5.4.1+📡 Detection & Monitoring
Log Indicators:
- Unauthorized API access attempts
- Unusual configuration changes
- Authentication failures followed by successful API calls
Network Indicators:
- Unexpected traffic to device management ports (typically 80/443)
- API requests from unauthorized IP addresses
SIEM Query:
source_ip NOT IN (trusted_management_ips) AND dest_port IN (80,443) AND dest_ip IN (cambium_device_ips) AND http_method IN (POST,PUT,DELETE)