HCL BigFix RunBookAI Vulnerability Allows Command Smuggling
The National Vulnerability Database has disclosed CVE-2025-31951, a high-severity vulnerability impacting HCL BigFix RunBookAI. This flaw, rated 8.8 CVSS (High), stems from unvalidated command input, which could enable unauthorized command execution within the product.
This isn’t just a bug; it’s a direct path to system compromise. An attacker leveraging this vulnerability could smuggle commands past the intended input handler, effectively running arbitrary code with the privileges of the BigFix RunBookAI service. The impact is severe, allowing for high confidentiality, integrity, and availability compromise.
Defenders need to treat this as a critical alert. While specific affected product versions were not detailed by the National Vulnerability Database, any organization running HCL BigFix RunBookAI should assume exposure. This is a prime target for lateral movement and privilege escalation in environments already using BigFix for endpoint management.
What This Means For You
- If your organization utilizes HCL BigFix RunBookAI, you need to identify all instances and monitor for an official patch from HCL. Prioritize applying this fix immediately upon release. Review your BigFix logs for any unusual command execution attempts or service behavior that might indicate exploitation.
Related ATT&CK Techniques
🛡️ Detection Rules
2 rules · 6 SIEM formats2 detection rules auto-generated for this incident, mapped to MITRE ATT&CK. Sigma YAML is free — export to any SIEM format via the Intel Bot.
CVE-2025-31951 HCL BigFix RunBookAI Command Smuggling Attempt
title: CVE-2025-31951 HCL BigFix RunBookAI Command Smuggling Attempt
id: scw-2026-05-06-ai-1
status: experimental
level: critical
description: |
Detects attempts to exploit CVE-2025-31951 by targeting the RunBookAI API endpoint with path traversal characters in the URI, indicating potential command smuggling for unauthorized command execution.
author: SCW Feed Engine (AI-generated)
date: 2026-05-06
references:
- https://shimiscyberworld.com/posts/nvd-CVE-2025-31951/
tags:
- attack.initial_access
- attack.t1190
logsource:
category: webserver
detection:
selection:
cs-uri-query|contains:
- 'runbookai/api/v1/execute'
cs-uri|contains:
- '..%2f..%2f..%2f..%2f..%2f..%2f..%2f..%2f..%2f..%2f..%2f..'
cs-method|exact:
- 'POST'
condition: cs-uri-query AND cs-uri AND cs-method
falsepositives:
- Legitimate administrative activity
Source: Shimi's Cyber World · License & reuse
Indicators of Compromise
| ID | Type | Indicator |
|---|---|---|
| CVE-2025-31951 | Command Injection | HCL BigFix RunBookAI |
| CVE-2025-31951 | Command Injection | Unvalidated Command Input / Potential Command Smuggling |
Written by SCW Vulnerability Desk
Source & Attribution
| Source Platform | NVD |
| Channel | National Vulnerability Database |
| Published | May 06, 2026 at 15:16 UTC |
This content was AI-rewritten and enriched by Shimi's Cyber World based on the original source. All intellectual property rights remain with the original author.
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