{"answers":{"affected":"2 open source packages ship an affected version, including io.projectreactor.netty:reactor-netty-http. It affects 1 product.","exploited":"There is no known exploitation of CVE-2020-5403 in the wild and no public exploit code.","fix":"Upgrade io.projectreactor.netty:reactor-netty-http to 0.9.5 or later.","what":"CVE-2020-5403 is a medium-severity denial of service vulnerability in Pivotal Reactor Netty, published on 3 Mar 2020. 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-2020-5403 and fix it if it is affected.\n\nWhat it is: CVE-2020-5403 is a medium-severity denial of service vulnerability in Pivotal Reactor Netty, published on 3 Mar 2020. 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-2020-5403 in the wild and no public exploit code.\n\nAffected packages and fixed versions:\n- io.projectreactor.netty:reactor-netty-http (Maven): affected from 0.9.3; fixed in 0.9.5\n- io.projectreactor.netty:reactor-netty-http (Maven): affected from 0.9.3; fixed in 0.9.5\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-2020-5403/ (Markdown: https://insights.sbomify.com/CVE-2020-5403/index.md)","id":"CVE-2020-5403","markdown":"https://insights.sbomify.com/CVE-2020-5403/index.md","name":"CVE-2020-5403","record":{"aliases":["GHSA-hp5x-rqf7-43vf"],"analysis":{"component_type":"library","fix_type":"upgrade","impacts":["denial_of_service"],"network_reachable":"yes","non_default_config":false,"product_category":"Java HTTP server library","requires_auth":"none","summary":"Attackers can cause premature connection closure via malformed URLs in Reactor Netty, leading to denial of service.","user_interaction":"required","vuln_class":"denial_of_service"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"pivotal","cpe":[{"product":"reactor_netty","vendor":"broadcom"}],"cvss":{"score":6.5,"severity":"medium","source":"cna","vector":"CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H","version":"3.0"},"cwes":[{"id":"CWE-755","name":"Improper Handling of Exceptional Conditions"},{"id":"CWE-20","name":"Improper Input Validation"}],"description":"Reactor Netty HttpServer, versions 0.9.3 and 0.9.4, is exposed to a URISyntaxException that causes the connection to be closed prematurely instead of producing a 400 response.","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":"DoS Via Malformed URL with Reactor Netty HTTP Server","id":"CVE-2020-5403","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"Maven","product":null,"products":[],"type":"denial_of_service","year":"2020"},"n_packages":2,"n_references":1,"next":{"headline":"Authentication Leak On Redirect With Reactor Netty HttpClient","id":"CVE-2020-5404"},"packages":[{"ecosystem":"Maven","fixed":["0.9.5"],"introduced":["0.9.3"],"last_affected":[],"package":"io.projectreactor.netty:reactor-netty-http","purl":null,"source":"GHSA-hp5x-rqf7-43vf"},{"ecosystem":"Maven","fixed":["0.9.5"],"introduced":["0.9.3"],"last_affected":[],"package":"io.projectreactor.netty:reactor-netty-http","purl":"pkg:maven/io.projectreactor.netty/reactor-netty-http","source":"GHSA-hp5x-rqf7-43vf"}],"prev":{"headline":"UAA fails to check the state parameter when authenticating with external IDPs","id":"CVE-2020-5402"},"products":["Reactor Netty"],"published":"2020-03-03","related":[{"cvss_score":7.5,"headline":"In Reactor Netty HTTP Server a malicious user can send a request using a specially crafted URL that can lead to a directory traversal attack","id":"CVE-2023-34062","kev_date_added":null,"published":"2023-11-15"},{"cvss_score":6.8,"headline":"Reactor Netty authentication leak in redirects","id":"CVE-2019-11284","kev_date_added":null,"published":"2019-10-17"},{"cvss_score":6.5,"headline":"Authentication Leak On Redirect With Reactor Netty HttpClient","id":"CVE-2020-5404","kev_date_added":null,"published":"2020-03-03"},{"cvss_score":6.1,"headline":"Reactor Netty WebSocket Client Leaks Credentials On Redirect","id":"CVE-2026-47848","kev_date_added":null,"published":"2026-08-26"},{"cvss_score":5.3,"headline":"Reactor Netty HTTP Server Leaks Exception Details","id":"CVE-2026-47844","kev_date_added":null,"published":"2026-08-26"},{"cvss_score":5.3,"headline":"Reactor Netty HTTP Server may incorrectly evaluate proxy addresses","id":"CVE-2026-47845","kev_date_added":null,"published":"2026-08-26"}],"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":["Pivotal"]},"summary":"Attackers can cause premature connection closure via malformed URLs in Reactor Netty, leading to denial of service.","url":"https://insights.sbomify.com/CVE-2020-5403/"}