Security readout for executives and security teams
Plain-English summary
CVE-2021-47876 is a denial-of-service issue in GeoGebra Classic 5.0.631.0. Oversized content entered into the application’s input field can crash the program. This affects availability of the local application, not data theft or system compromise based on the provided sources.
Executive priority
Prioritize remediation where GeoGebra is used in teaching, exams, labs, or shared systems. Business impact is interruption of application availability, not known data exposure. Treat as a targeted availability risk unless vendor guidance or new evidence expands impact.
Technical view
The issue is reported as CWE-770, improper resource allocation without limits. GeoGebra Classic 5.0.631.0 can crash when handling oversized input in the “Entrada” input field. The CVSS 3.1 score is 7.5, driven by availability impact only. Sources do not identify confidentiality or integrity impact.
Likely exposure
Organizations are exposed if they run GeoGebra Classic 5.0.631.0, especially in classrooms, labs, or shared endpoints where users can provide arbitrary input. Exposure is application-level availability disruption rather than confirmed host takeover.
Exploitation context
A public ExploitDB reference exists, but the CVE is not listed as KEV in the provided bundle. The sources do not show confirmed active exploitation. The described trigger requires oversized input handling by the affected application.
Researcher notes
Evidence is limited to the CVE record, VulnCheck advisory, vendor homepage, and ExploitDB reference. There is a mismatch between the CVSS vector showing no user interaction and the description involving input field use. No patch version is named in the provided sources.
Mitigation direction
- Inventory GeoGebra Classic installations and identify version 5.0.631.0.
- Check GeoGebra vendor guidance for fixed versions or recommended mitigations.
- Upgrade or replace affected installations if vendor-supported updates are available.
- Limit use of affected versions in shared or high-availability environments.
- Avoid accepting untrusted oversized input in the affected application.
Validation and detection
- Confirm installed GeoGebra Classic version on managed endpoints.
- Review vendor and advisory pages for update or remediation details.
- Verify affected versions are removed or upgraded after remediation.
- Do not crash production systems during validation testing.
- Document remaining exceptions and compensating controls.
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-770: Exact CWE lookup
Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupCVE-2021-47876 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- High
- CVSS
- 7.5 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H3.93.6Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
7.5HighVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source materials
- CVE List V5 sourceCVE List V5
- ExploitDB-49654CVE reference · exploit
- Official Vendor HomepageCVE reference · product
- VulnCheck Advisory: GeoGebra Classic 5.0.631.0-d - Denial of ServiceCVE reference · third-party-advisory
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Allocation of Resources Without Limits or Throttling
Allocation of Resources Without Limits or Throttling represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.