CVE-2025-27925
📋 TL;DR
CVE-2025-27925 is an insecure deserialization vulnerability in Nintex Automation that allows attackers to execute arbitrary code by sending malicious serialized data. This affects organizations using Nintex Automation versions 5.6 and 5.7 before 5.8. Attackers could potentially gain full control of affected systems.
💻 Affected Systems
- Nintex Automation
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to complete system compromise, data exfiltration, and lateral movement within the network.
Likely Case
Unauthorized code execution with the privileges of the Nintex Automation service account, potentially leading to data manipulation or service disruption.
If Mitigated
Limited impact if proper input validation and network segmentation are in place, though risk remains significant.
🎯 Exploit Status
Exploitation requires understanding of Nintex's serialization format and sending crafted payloads. No public exploit code is currently available.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 5.8
Vendor Advisory: https://help.nintex.com/en-US/platform/ReleaseNotes/K2Five.htm
Restart Required: No
Instructions:
1. Download Nintex Automation 5.8 from the Nintex portal. 2. Run the installer to upgrade from affected versions. 3. Verify the upgrade completed successfully. 4. Test automation workflows to ensure functionality.
🔧 Temporary Workarounds
Network Segmentation
allRestrict network access to Nintex Automation servers to only trusted sources and required services.
Input Validation
allImplement additional input validation for all user-supplied data before processing by Nintex Automation.
🧯 If You Can't Patch
- Implement strict network access controls to limit who can communicate with Nintex Automation servers.
- Monitor for unusual process creation or network activity from Nintex Automation service accounts.
🔍 How to Verify
Check if Vulnerable:
Check Nintex Automation version in the administration console or via the installed programs list. Versions 5.6 or 5.7 indicate vulnerability.Check Version:
Check via Nintex Automation administration portal or Windows Programs and Features.Verify Fix Applied:
Confirm version shows 5.8 or higher in the administration console and verify no unusual activity in logs.📡 Detection & Monitoring
Log Indicators:
- Unusual serialization errors in Nintex logs
- Unexpected process creation from Nintex service account
- Suspicious network connections from Nintex server
Network Indicators:
- Unusual HTTP requests to Nintex Automation endpoints with serialized data
- Outbound connections from Nintex server to unexpected destinations
SIEM Query:
source="nintex*" AND (event_type="deserialization_error" OR process_name="powershell.exe" OR cmdline="*serialize*")