CVE-2026-22542
📋 TL;DR
This vulnerability allows an attacker on the internal network to cause a denial of service by establishing two concurrent Telnet connections to the system. Systems running affected Thales products with Telnet enabled are vulnerable. The attack disrupts service availability but doesn't compromise data integrity or confidentiality.
💻 Affected Systems
- Thales products with Telnet service enabled
⚠️ 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
Complete system unavailability requiring manual intervention to restore service, potentially affecting critical operations.
Likely Case
Service disruption affecting Telnet connectivity and potentially related system functions until connections are terminated.
If Mitigated
Minimal impact if Telnet is disabled or network segmentation prevents internal attackers from reaching the service.
🎯 Exploit Status
Simple attack requiring only network access and ability to establish two Telnet connections
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Not specified
Vendor Advisory: https://cds.thalesgroup.com/en
Restart Required: No
Instructions:
1. Check Thales advisory for specific patch information
2. Apply any available updates
3. Verify Telnet service behavior after update
🔧 Temporary Workarounds
Disable Telnet Service
linuxCompletely disable Telnet service to prevent exploitation
systemctl disable telnet.socket
systemctl stop telnet.socket
Network Access Control
linuxRestrict Telnet access to specific trusted IP addresses
iptables -A INPUT -p tcp --dport 23 -s TRUSTED_IP -j ACCEPT
iptables -A INPUT -p tcp --dport 23 -j DROP
🧯 If You Can't Patch
- Implement strict network segmentation to isolate Telnet services
- Use SSH instead of Telnet for remote access and disable Telnet completely
🔍 How to Verify
Check if Vulnerable:
Check if Telnet service is running and accessible: netstat -tlnp | grep :23Check Version:
Check product documentation for version-specific commandsVerify Fix Applied:
Attempt to establish two concurrent Telnet connections and verify service remains available📡 Detection & Monitoring
Log Indicators:
- Multiple Telnet connection attempts from same source
- Telnet service crash/restart logs
Network Indicators:
- Two concurrent Telnet connections from same source IP
- Telnet port 23 traffic patterns showing DoS behavior
SIEM Query:
source_port=23 AND event_count>1 FROM same_source_ip WITHIN 5s