CVE-2025-6920
📋 TL;DR
CVE-2025-6920 is an authentication bypass vulnerability in ai-inference-server's model inference API. The POST /invocations endpoint fails to validate API keys, allowing unauthorized users to access inference features intended for protected endpoints. Organizations using ai-inference-server with the vulnerable version are affected.
💻 Affected Systems
- ai-inference-server
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Unauthorized users could access sensitive AI inference capabilities, potentially exposing proprietary models, consuming computational resources, or accessing backend systems through the inference functionality.
Likely Case
Unauthorized inference requests leading to resource consumption, potential data leakage through model outputs, or access to functionality intended only for authorized users.
If Mitigated
Limited impact if proper network segmentation, rate limiting, and additional authentication layers are in place beyond the vulnerable endpoint.
🎯 Exploit Status
Exploitation requires only sending HTTP POST requests to the vulnerable endpoint without valid authentication headers.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check Red Hat advisory for specific patched version
Vendor Advisory: https://access.redhat.com/security/cve/CVE-2025-6920
Restart Required: Yes
Instructions:
1. Check the Red Hat advisory for the patched version. 2. Update ai-inference-server to the patched version. 3. Restart the ai-inference-server service. 4. Verify authentication is now enforced on POST /invocations endpoint.
🔧 Temporary Workarounds
Web Application Firewall Rule
allBlock or require authentication for POST requests to /v1/invocations endpoint
# Example WAF rule to block unauthenticated POST /v1/invocations
# Implementation depends on specific WAF platform
Reverse Proxy Authentication
linuxConfigure reverse proxy (nginx, Apache) to require authentication before forwarding to vulnerable endpoint
# nginx example: location /v1/invocations { auth_request /auth; }
# Configure authentication endpoint validation
🧯 If You Can't Patch
- Implement network-level controls to restrict access to the vulnerable endpoint to authorized IP addresses only
- Deploy additional authentication layer (API gateway, reverse proxy) that validates API keys before requests reach the vulnerable endpoint
🔍 How to Verify
Check if Vulnerable:
Send a POST request to /v1/invocations without authentication headers. If it succeeds, the system is vulnerable.Check Version:
Check ai-inference-server version via package manager or service status command specific to your deploymentVerify Fix Applied:
Send a POST request to /v1/invocations without authentication headers. It should return 401 Unauthorized or similar error.📡 Detection & Monitoring
Log Indicators:
- Successful POST requests to /v1/invocations without authentication headers in access logs
- Unusual spike in inference requests from unauthenticated sources
Network Indicators:
- HTTP POST traffic to /v1/invocations endpoint without Authorization headers
- Unusual inference request patterns from unexpected sources
SIEM Query:
http.method:POST AND http.uri:"/v1/invocations" AND NOT http.headers.authorization:*