{"answers":{"affected":"4 open source packages ship an affected version, including com.vaadin:flow-server. It affects 2 products.","exploited":"There is no known exploitation of CVE-2020-36321 in the wild and no public exploit code.","fix":"Upgrade com.vaadin:flow-server to a fixed version for your release line: 2.4.2 or 5.0.0.","what":"CVE-2020-36321 is a medium-severity path traversal vulnerability in Vaadin, published on 23 Apr 2021. An attacker can exploit it over the internet without logging in, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2020-36321 and fix it if it is affected.\n\nWhat it is: CVE-2020-36321 is a medium-severity path traversal vulnerability in Vaadin, published on 23 Apr 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.\nExploitation: There is no known exploitation of CVE-2020-36321 in the wild and no public exploit code.\n\nAffected packages and fixed versions:\n- com.vaadin:flow-server (Maven): affected from 2.0.0; fixed in 2.4.2\n- com.vaadin:flow-server (Maven): affected from 2.0.0; fixed in 2.4.2\n- com.vaadin:flow-server (Maven): affected from 3.0.0; fixed in 5.0.0\n- com.vaadin:flow-server (Maven): affected from 3.0.0; fixed in 5.0.0\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-2020-36321/ (Markdown: https://insights.sbomify.com/CVE-2020-36321/index.md)","id":"CVE-2020-36321","markdown":"https://insights.sbomify.com/CVE-2020-36321/index.md","name":"CVE-2020-36321","record":{"aliases":["GHSA-49r2-73m6-pp8f"],"analysis":{"component_type":"library","fix_type":"upgrade","impacts":["data_read"],"network_reachable":"yes","non_default_config":true,"product_category":"Vaadin flow-server","requires_auth":"none","summary":"Attackers can read arbitrary files outside the intended directory via improper URL validation in the development mode handler.","user_interaction":"not_required","vuln_class":"path_traversal"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"Vaadin","cpe":[{"product":"flow","vendor":"vaadin"},{"product":"vaadin","vendor":"vaadin"}],"cvss":{"score":5.9,"severity":"medium","source":"cna","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N","version":"3.1"},"cwes":[{"id":"CWE-22","name":"Improper Limitation of a Pathname to a Restricted Directory"}],"description":"Improper URL validation in development mode handler in com.vaadin:flow-server versions 2.0.0 through 2.4.1 (Vaadin 14.0.0 through 14.4.2), and 3.0 prior to 5.0 (Vaadin 15 prior to 18) allows attacker to request arbitrary files stored outside of intended frontend resources folder.","ecosystems":["Maven"],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"none_known"},"has_fix":true,"headline":"Directory traversal in development mode handler in Vaadin 14 and 15-17","id":"CVE-2020-36321","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"Maven","product":null,"products":[],"type":"path_traversal","year":"2020"},"n_packages":4,"n_references":2,"next":{"headline":"Denial of service in n/a","id":"CVE-2020-36322"},"packages":[{"ecosystem":"Maven","fixed":["2.4.2"],"introduced":["2.0.0"],"last_affected":[],"package":"com.vaadin:flow-server","purl":null,"source":"GHSA-49r2-73m6-pp8f"},{"ecosystem":"Maven","fixed":["2.4.2"],"introduced":["2.0.0"],"last_affected":[],"package":"com.vaadin:flow-server","purl":"pkg:maven/com.vaadin/flow-server","source":"GHSA-49r2-73m6-pp8f"},{"ecosystem":"Maven","fixed":["5.0.0"],"introduced":["3.0.0"],"last_affected":[],"package":"com.vaadin:flow-server","purl":null,"source":"GHSA-49r2-73m6-pp8f"},{"ecosystem":"Maven","fixed":["5.0.0"],"introduced":["3.0.0"],"last_affected":[],"package":"com.vaadin:flow-server","purl":"pkg:maven/com.vaadin/flow-server","source":"GHSA-49r2-73m6-pp8f"}],"prev":{"headline":"Regular expression Denial of Service (ReDoS) in EmailValidator class in Vaadin 7","id":"CVE-2020-36320"},"products":["Vaadin","flow-server"],"published":"2021-04-23","related":[{"cvss_score":8.6,"headline":"Server classes and resources exposure in OSGi applications using Vaadin 12-14 and 19","id":"CVE-2021-31407","kev_date_added":null,"published":"2021-04-23"},{"cvss_score":7.5,"headline":"Regular expression denial of service (ReDoS) in EmailField component in Vaadin 14 and 15-17","id":"CVE-2021-31405","kev_date_added":null,"published":"2021-04-23"},{"cvss_score":6.3,"headline":"Insecure temporary directory usage in frontend build functionality of Vaadin 14 and 15-19","id":"CVE-2021-31411","kev_date_added":null,"published":"2021-05-05"},{"cvss_score":6.3,"headline":"Server session is not invalidated when logout() helper method of Authentication module is used in Vaadin 18-19","id":"CVE-2021-31408","kev_date_added":null,"published":"2021-04-23"},{"cvss_score":6.1,"headline":"Reflected cross-site scripting in default RouteNotFoundError view in Vaadin 10 and 11-13","id":"CVE-2019-25027","kev_date_added":null,"published":"2021-04-23"},{"cvss_score":5.3,"headline":"Possible route enumeration in production mode via RouteNotFoundError view in Vaadin 10, 11-14, and 15-19","id":"CVE-2021-31412","kev_date_added":null,"published":"2021-06-24"}],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"class":"attribution","licence":"CC BY 4.0","name":"GitHub Advisory Database","prefix":"GHSA"},{"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":"2024-09-17","vendors":["Vaadin"]},"summary":"Attackers can read arbitrary files outside the intended directory via improper URL validation in the development mode handler.","url":"https://insights.sbomify.com/CVE-2020-36321/"}