{"answers":{"affected":"It affects 1 product.","exploited":"There is no known exploitation of CVE-2021-20777 in the wild and no public exploit code.","fix":"No fix has been published for CVE-2021-20777 yet. Limit exposure of the affected software until one is available.","what":"CVE-2021-20777 is a medium-severity missing authorization vulnerability in G.U. CO., LTD. GU App for Android, published on 7 Jul 2021. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link."},"fix_prompt":"Check this codebase for CVE-2021-20777 and fix it if it is affected.\n\nWhat it is: CVE-2021-20777 is a medium-severity missing authorization vulnerability in G.U. CO., LTD. GU App for Android, published on 7 Jul 2021. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.\nExploitation: There is no known exploitation of CVE-2021-20777 in the wild and no public exploit code.\n\nAffected product: G.U. CO., LTD. GU App for Android. 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-2021-20777/ (Markdown: https://insights.sbomify.com/CVE-2021-20777/index.md)","id":"CVE-2021-20777","markdown":"https://insights.sbomify.com/CVE-2021-20777/index.md","name":"CVE-2021-20777","record":{"aliases":["GHSA-q6p4-2q7c-4vw7"],"analysis":{"component_type":"mobile_application","fix_type":"upgrade","impacts":["security_bypass"],"network_reachable":"yes","non_default_config":false,"product_category":"GU Android App","requires_auth":"none","summary":"A remote attacker can trick users into accessing arbitrary websites via the app's custom URL scheme due to improper authorization checks.","user_interaction":"required","vuln_class":"missing_authorization"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"jpcert","cpe":[{"product":"gu","vendor":"gu-global"}],"cvss":{"score":4.3,"severity":"medium","source":"nvd","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N","version":"3.1"},"cwes":[{"id":"CWE-862","name":"Missing Authorization"}],"description":"Improper authorization in handler for custom URL scheme vulnerability in GU App for Android versions from 4.8.0 to 5.0.2 allows a remote attacker to lead a user to access an arbitrary website via the vulnerable App.","ecosystems":[],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"none_known"},"has_fix":null,"headline":"Missing authorization in GU App for Android","id":"CVE-2021-20777","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":null,"products":[],"type":"missing_authorization","year":"2021"},"n_packages":0,"n_references":1,"next":{"headline":"Missing authorization in EC-CUBE","id":"CVE-2021-20778"},"packages":[],"prev":{"headline":"Auth bypass in SCT-40CM01SR and AT-40CM01SR","id":"CVE-2021-20776"},"products":["GU App for Android"],"published":"2021-07-07","related":[],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"class":"attribution","licence":"US public information, NVD API terms","name":"NVD"},{"class":"attribution","licence":"CWE Terms of Use","name":"CWE (MITRE)"},{"class":"attribution","licence":"FIRST CVSS licence","name":"CVSS (FIRST)"}],"ssvc":{"automatable":null,"exploitation":null,"technical_impact":null},"state":"PUBLISHED","updated":"2024-08-03","vendors":["G.U. CO., LTD."]},"summary":"A remote attacker can trick users into accessing arbitrary websites via the app's custom URL scheme due to improper authorization checks.","url":"https://insights.sbomify.com/CVE-2021-20777/"}