Vulnerability · Published Jan 21, 2026 · Assigned by VulnCheck
CVE-2021-47876GeoGebra Classic 5.0.631.0-d - Denial of Service
High 7.5
In plain English
A high-severity resource allocation without limits in GeoGebra Classic from GeoGebra. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 21% of all known vulnerabilities).
Severity (CVSS 3.1)7.5High
Exploit odds (30 days)0.3%top 79.0% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack toolingNoneno public tooling known
Official description
GeoGebra Classic 5.0.631.0-d contains a denial of service vulnerability in the input field that allows attackers to crash the application by sending oversized buffer content. Attackers can generate a large buffer of 800,000 repeated characters and paste it into the 'Entrada:' input field to trigger an application crash.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| GeoGebra | GeoGebra Classic | 5.0.631.0 |
Weakness: CWE-770 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
References
- ExploitDB-49654 exploit
- Official Vendor Homepage product
- VulnCheck Advisory: GeoGebra Classic 5.0.631.0-d - Denial of Service third-party-advisory