CVE-2025-57521
📋 TL;DR
Bambu Studio versions 2.1.1.52 and earlier contain a vulnerability that allows local attackers to execute arbitrary code during application startup. The application loads network plugins without proper signature validation, enabling attackers to place malicious components in user-writable directories like %APPDATA%. This affects all users running vulnerable versions of Bambu Studio.
💻 Affected Systems
- Bambu Studio
⚠️ 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 through arbitrary code execution with user privileges, potentially leading to data theft, ransomware deployment, or lateral movement within the network.
Likely Case
Local privilege escalation leading to user account compromise, data exfiltration, or installation of persistent malware.
If Mitigated
Limited impact if proper application whitelisting and user privilege restrictions are in place, though user data could still be compromised.
🎯 Exploit Status
Proof-of-concept code is publicly available on GitHub. Exploitation requires local access to the target system and knowledge of Bambu Studio's plugin loading mechanism.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 2.3.0 and later
Vendor Advisory: https://wiki.bambulab.com/en/software/bambu-studio/release/release-note-2-3-0
Restart Required: No
Instructions:
1. Open Bambu Studio. 2. Go to Help > Check for Updates. 3. Follow prompts to update to version 2.3.0 or later. 4. Alternatively, download the latest version from the official Bambu Lab website.
🔧 Temporary Workarounds
Restrict plugin directory permissions
allSet strict permissions on Bambu Studio plugin directories to prevent unauthorized file writes
Windows: icacls "%APPDATA%\BambuStudio\plugins" /deny Users:(OI)(CI)W
macOS/Linux: chmod 755 ~/.config/BambuStudio/plugins
🧯 If You Can't Patch
- Implement application whitelisting to prevent execution of unauthorized binaries from user directories.
- Use least privilege principles - ensure users don't have write access to Bambu Studio installation directories.
🔍 How to Verify
Check if Vulnerable:
Check Bambu Studio version in Help > About. If version is 2.1.1.52 or earlier, the system is vulnerable.Check Version:
Windows: "C:\Program Files\BambuStudio\BambuStudio.exe" --version, macOS: /Applications/BambuStudio.app/Contents/MacOS/BambuStudio --version, Linux: bambu-studio --versionVerify Fix Applied:
Verify version is 2.3.0 or later in Help > About. Check that plugin signature validation is enabled in application settings.📡 Detection & Monitoring
Log Indicators:
- Unexpected process launches from Bambu Studio directories
- File writes to Bambu Studio plugin directories by non-Bambu processes
- Security software alerts about unsigned DLLs loading with Bambu Studio
Network Indicators:
- Unusual outbound connections from Bambu Studio process
- DNS requests to suspicious domains after Bambu Studio startup
SIEM Query:
Process Creation where (Image contains 'BambuStudio' OR ParentImage contains 'BambuStudio') AND CommandLine contains unusual parameters OR Image loads from user writable directories