CVE-2021-47875
📋 TL;DR
GeoGebra CAS Calculator 6.0.631.0 contains a buffer overflow vulnerability that allows attackers to crash the application by pasting a specially crafted payload into the input field. This affects all users running the vulnerable version of the calculator software. The vulnerability enables denial of service attacks against the calculator application.
💻 Affected Systems
- GeoGebra CAS Calculator
⚠️ 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 application crash requiring restart, potential loss of unsaved work, and disruption of mathematical calculations in progress.
Likely Case
Application crash requiring manual restart, minor productivity disruption for users relying on the calculator.
If Mitigated
No impact if patched version is installed or if input validation prevents the exploit.
🎯 Exploit Status
Exploit requires pasting 8000 repeated characters into the calculator input field. No authentication or special privileges needed.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Versions after 6.0.631.0
Vendor Advisory: https://www.geogebra.org
Restart Required: Yes
Instructions:
1. Open GeoGebra CAS Calculator. 2. Go to Help > Check for Updates. 3. Follow prompts to download and install latest version. 4. Restart the application.
🔧 Temporary Workarounds
Input Validation Restriction
allLimit input length in calculator field to prevent buffer overflow
Not applicable - requires code modification
Application Sandboxing
allRun calculator in restricted environment to limit impact of crashes
Not applicable - configuration dependent
🧯 If You Can't Patch
- Restrict calculator usage to trusted users only
- Monitor for repeated application crashes and investigate source
🔍 How to Verify
Check if Vulnerable:
Check if GeoGebra CAS Calculator version is 6.0.631.0 in Help > AboutCheck Version:
Not applicable - check via application GUI Help > AboutVerify Fix Applied:
Verify version is newer than 6.0.631.0 and test by pasting 8000 characters into input field📡 Detection & Monitoring
Log Indicators:
- Application crash logs
- Unexpected termination events
Network Indicators:
- Not applicable - local application only
SIEM Query:
EventID: 1000 OR EventID: 1001 (Application Error) AND ProcessName: GeoGebra.exe