CVE-2021-47876Public exploit

Application crash via oversized Entrada input

Published Jan 21, 2026 · Updated Jan 21, 2026

Denial of service in GeoGebra Classic 5.0.631.0 allows local users to crash the application by pasting oversized text into Entrada. The Entrada input field accepts and processes an 800,000-character buffer without an effective size or resource limit, terminating the desktop process. Exploitation requires access to the graphical input field and causes an application crash, with no reported data disclosure or modification.

CVSS severity6.7
Medium
EPSS probability0.25%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in GeoGebra Classic 5.0.631.0 allows local users to crash the application by pasting oversized text into Entrada. The Entrada input field accepts and processes an 800,000-character buffer without an effective size or resource limit, terminating the desktop process. Exploitation requires access to the graphical input field and causes an application crash, with no reported data disclosure or modification.

The record

CVE
CVE-2021-47876
Published
Jan 21, 2026
Updated
Jan 21, 2026
Vendor
GeoGebra
Product
GeoGebra Classic
Classifications
CWE-770, T1499
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 21, 2026CVE publishedPublication date reported by the CVE source.
  2. Jan 21, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=5.0.631.0

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

GeoGebra · GeoGebra Classicversion=5.0.631.0

Published CVSS scores

6.7VulnCheckCVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
7.5VulnCheckCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-770Allocation of Resources Without Limits or Throttling
T1499Endpoint Denial of Service

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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