CVE-2021-47877
Published: 21 January 2026
Summary
CVE-2021-47877 is a high-severity Allocation of Resources Without Limits or Throttling (CWE-770) vulnerability in Geogebra (inferred from references). Its CVSS base score is 7.5 (High).
Operationally, ranked at the 12.7th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog; a public proof-of-concept is referenced.
Threat & Defense Details
Likely Mitigating ControlsAI
Per-CVE control mapping for this CVE has not run yet; the list below is derived from the weakness types (CWEs) cited in the NVD entry.
This control implements explicit throttling on session allocation, addressing the weakness of allocating resources without limits.
Plan testing exercises resource allocation limits and throttling during simulated failures, directly addressing weaknesses that allow unbounded resource use.
Contingency plan updates ensure recovery strategies address unbounded resource allocation, making it harder for attackers to exploit lack of throttling to cause prolonged outages.
Provides continuity when unbounded resource allocation at the primary site leads to exhaustion and downtime.
Alternate services allow operations to continue when primary allocation of resources lacks limits or throttling.
Explicit planning of security-related actions requires defining limits, windows, and resource allocations, making allocation without throttling far less likely.
Measures of performance include tracking allocation behavior and throttling effectiveness, reducing the window for resource exhaustion attacks.
Imposes an inactivity-based limit on network resource allocation, throttling the number of concurrently held connections.
NVD Description
GeoGebra Graphing Calculator 6.0.631.0 contains a denial of service vulnerability that allows attackers to crash the application by inputting an oversized buffer. Attackers can generate a payload of 8000 repeated characters to overwhelm the input field and cause the application…
more
to become unresponsive.
Deeper analysisAI
CVE-2021-47877 is a denial of service vulnerability in GeoGebra Graphing Calculator version 6.0.631.0. The flaw stems from inadequate handling of oversized input buffers, where attackers can input a payload of 8000 repeated characters into an input field, overwhelming the application and causing it to crash or become unresponsive. It is classified under CWE-770 (Allocation of Resources Without Limits or Throttling) with a CVSS v3.1 base score of 7.5 (AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H).
The vulnerability can be exploited remotely by any unauthenticated attacker with low attack complexity and no user interaction required. Exploitation involves crafting and delivering the oversized character payload to the affected input field, resulting in high-impact denial of service that renders the graphing calculator application unusable.
Advisories and a proof-of-concept exploit are documented in references such as Exploit-DB (https://www.exploit-db.com/exploits/49653) and Vulncheck (https://www.vulncheck.com/advisories/geogebra-graphing-calculator-denial-of-service), with the official GeoGebra site at https://www.geogebra.org. No specific patch or mitigation details are outlined in the provided information.
Details
- CWE(s)