{"answers":{"affected":"","exploited":"It is not confirmed as exploited in the wild, but public exploit code for CVE-2021-47876 exists.","fix":"No fix has been published for CVE-2021-47876 yet. Limit exposure of the affected software until one is available.","what":"CVE-2021-47876 is a medium-severity denial of service vulnerability in GeoGebra Classic, published on 21 Jan 2026. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link."},"fix_prompt":"Check this codebase for CVE-2021-47876 and fix it if it is affected.\n\nWhat it is: CVE-2021-47876 is a medium-severity denial of service vulnerability in GeoGebra Classic, published on 21 Jan 2026. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.\nExploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2021-47876 exists.\n\nAffected product: GeoGebra Classic. No package-level version data is available, so check the vendor advisory linked from the reference page.\n\nTask:\n1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.\n2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.\n3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.\n4. Run the tests and summarise what changed and why.\n5. If nothing in the project is affected, say so and change nothing.\n\nReference: https://insights.sbomify.com/CVE-2021-47876/ (Markdown: https://insights.sbomify.com/CVE-2021-47876/index.md)","id":"CVE-2021-47876","markdown":"https://insights.sbomify.com/CVE-2021-47876/index.md","name":"CVE-2021-47876","record":{"aliases":["GHSA-fqhq-3xgh-rx7h"],"analysis":{"component_type":"desktop_application","fix_type":"no_fix_stated","impacts":["denial_of_service"],"network_reachable":"adjacent_or_local","non_default_config":false,"product_category":"GeoGebra Classic","requires_auth":"none","summary":"Attackers can crash GeoGebra Classic by pasting oversized input into the Entrada field, causing a denial of service.","user_interaction":"required","vuln_class":"denial_of_service"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"VulnCheck","cpe":[],"cvss":{"score":6.7,"severity":"medium","source":"cna","vector":"CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","version":"4.0"},"cwes":[{"id":"CWE-770","name":"Allocation of Resources Without Limits or Throttling"}],"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.","ecosystems":[],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"weaponised"},"has_fix":null,"headline":"GeoGebra Classic 5.0.631.0-d - Denial of Service","id":"CVE-2021-47876","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":null,"products":[],"type":"denial_of_service","year":"2021"},"n_packages":0,"n_references":3,"next":{"headline":"GeoGebra Graphing Calculato‪r‬ 6.0.631.0 - Denial Of Service","id":"CVE-2021-47877"},"packages":[],"prev":{"headline":"GeoGebra CAS Calculator 6.0.631.0 - Denial of Service","id":"CVE-2021-47875"},"products":["GeoGebra Classic"],"published":"2026-01-21","related":[],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"class":"attribution","licence":"CWE Terms of Use","name":"CWE (MITRE)"},{"class":"attribution","licence":"FIRST CVSS licence","name":"CVSS (FIRST)"}],"ssvc":{"automatable":"no","exploitation":"poc","technical_impact":"partial"},"state":"PUBLISHED","updated":"2026-01-22","vendors":["GeoGebra"]},"summary":"Attackers can crash GeoGebra Classic by pasting oversized input into the Entrada field, causing a denial of service.","url":"https://insights.sbomify.com/CVE-2021-47876/"}