{"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-2021-31406 in the wild and no public exploit code.","fix":"Upgrade com.vaadin:flow-server to a fixed version for your release line: 5.0.4 or 6.0.1.","what":"CVE-2021-31406 is a medium-severity vulnerability in Vaadin, published on 23 Apr 2021. It can only be exploited from the same machine or local network, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2021-31406 and fix it if it is affected.\n\nWhat it is: CVE-2021-31406 is a medium-severity vulnerability in Vaadin, published on 23 Apr 2021. It can only be exploited from the same machine or local network, with no action from the victim.\nExploitation: There is no known exploitation of CVE-2021-31406 in the wild and no public exploit code.\n\nAffected packages and fixed versions:\n- com.vaadin:flow-server (Maven): affected from 3.0.0; fixed in 5.0.4\n- com.vaadin:flow-server (Maven): affected from 3.0.0; fixed in 5.0.4\n- com.vaadin:flow-server (Maven): affected from 6.0.0; fixed in 6.0.1\n- com.vaadin:flow-server (Maven): affected from 6.0.0; fixed in 6.0.1\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-2021-31406/ (Markdown: https://insights.sbomify.com/CVE-2021-31406/index.md)","id":"CVE-2021-31406","markdown":"https://insights.sbomify.com/CVE-2021-31406/index.md","name":"CVE-2021-31406","record":{"aliases":["GHSA-p7jq-v8jp-j424"],"analysis":{"component_type":"library","fix_type":"upgrade","impacts":["security_bypass"],"network_reachable":"adjacent_or_local","non_default_config":false,"product_category":"Vaadin Java library","requires_auth":"none","summary":"Attackers can bypass CSRF protection in Vaadin Fusion endpoints by exploiting a timing side channel to guess security tokens.","user_interaction":"not_required","vuln_class":"security_feature_bypass"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"Vaadin","cpe":[{"product":"flow","vendor":"vaadin"},{"product":"vaadin","vendor":"vaadin"}],"cvss":{"score":4,"severity":"medium","source":"cna","vector":"CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N","version":"3.1"},"cwes":[{"id":"CWE-203","name":"Observable Discrepancy"},{"id":"CWE-208","name":"Observable Timing Discrepancy"}],"description":"Non-constant-time comparison of CSRF tokens in endpoint request handler in com.vaadin:flow-server versions 3.0.0 through 5.0.3 (Vaadin 15.0.0 through 18.0.6), and com.vaadin:fusion-endpoint version 6.0.0 (Vaadin 19.0.0) allows attacker to guess a security token for Fusion endpoints via timing attack.","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":"Timing side channel vulnerability in endpoint request handler in Vaadin 15-19","id":"CVE-2021-31406","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"Maven","product":null,"products":[],"type":"security_feature_bypass","year":"2021"},"n_packages":4,"n_references":2,"next":{"headline":"Server classes and resources exposure in OSGi applications using Vaadin 12-14 and 19","id":"CVE-2021-31407"},"packages":[{"ecosystem":"Maven","fixed":["5.0.4"],"introduced":["3.0.0"],"last_affected":[],"package":"com.vaadin:flow-server","purl":null,"source":"GHSA-p7jq-v8jp-j424"},{"ecosystem":"Maven","fixed":["5.0.4"],"introduced":["3.0.0"],"last_affected":[],"package":"com.vaadin:flow-server","purl":"pkg:maven/com.vaadin/flow-server","source":"GHSA-p7jq-v8jp-j424"},{"ecosystem":"Maven","fixed":["6.0.1"],"introduced":["6.0.0"],"last_affected":[],"package":"com.vaadin:flow-server","purl":null,"source":"GHSA-p7jq-v8jp-j424"},{"ecosystem":"Maven","fixed":["6.0.1"],"introduced":["6.0.0"],"last_affected":[],"package":"com.vaadin:flow-server","purl":"pkg:maven/com.vaadin/flow-server","source":"GHSA-p7jq-v8jp-j424"}],"prev":{"headline":"Regular expression denial of service (ReDoS) in EmailField component in Vaadin 14 and 15-17","id":"CVE-2021-31405"},"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":5.9,"headline":"Directory traversal in development mode handler in Vaadin 14 and 15-17","id":"CVE-2020-36321","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 bypass CSRF protection in Vaadin Fusion endpoints by exploiting a timing side channel to guess security tokens.","url":"https://insights.sbomify.com/CVE-2021-31406/"}