CVE-2025-27456
📋 TL;DR
This vulnerability allows attackers to perform brute-force attacks against SMB server login mechanisms due to insufficient rate limiting. It affects systems running vulnerable SMB server implementations, potentially exposing credentials and enabling unauthorized access.
💻 Affected Systems
- SICK SMB server implementations
📦 What is this software?
⚠️ 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 compromise via credential theft leading to data exfiltration, ransomware deployment, or lateral movement within the network.
Likely Case
Unauthorized access to sensitive files and network shares, potentially leading to data theft or system manipulation.
If Mitigated
Limited impact with proper network segmentation, strong passwords, and monitoring detecting brute-force attempts.
🎯 Exploit Status
Brute-force attacks are well-understood and easily automated with existing tools
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: https://sick.com/psirt
Restart Required: No
Instructions:
1. Check SICK PSIRT for specific patch information
2. Apply vendor-provided updates
3. Verify SMB server configuration changes
🔧 Temporary Workarounds
Implement Network Segmentation
allIsolate SMB servers from untrusted networks and restrict access to authorized IPs only
Enable Account Lockout Policies
allConfigure account lockout after multiple failed authentication attempts
🧯 If You Can't Patch
- Implement network-level rate limiting for SMB traffic
- Deploy intrusion detection systems monitoring for SMB brute-force patterns
🔍 How to Verify
Check if Vulnerable:
Test SMB authentication with rapid failed login attempts using tools like Hydra or MetasploitCheck Version:
Check device firmware/software version via vendor-specific methodsVerify Fix Applied:
Verify that rate limiting or account lockout prevents successful brute-force testing📡 Detection & Monitoring
Log Indicators:
- Multiple failed SMB authentication attempts from single source
- Account lockout events
- Unusual SMB traffic patterns
Network Indicators:
- High volume of SMB protocol 445/tcp connections
- Rapid authentication failure packets
SIEM Query:
source_ip="*" AND destination_port=445 AND (event_type="authentication_failure" OR protocol="SMB") | stats count by source_ip | where count > 10🔗 References
- https://sick.com/psirt
- https://sick.com/psirt
- https://www.cisa.gov/resources-tools/resources/ics-recommended-practices
- https://www.endress.com
- https://www.first.org/cvss/calculator/3.1
- https://www.sick.com/.well-known/csaf/white/2025/sca-2025-0008.json
- https://www.sick.com/.well-known/csaf/white/2025/sca-2025-0008.pdf
