{"answers":{"affected":"24 open source packages ship an affected version, including symfony/security, symfony/security-http and symfony/symfony. It affects 2 products.","exploited":"There is no known exploitation of CVE-2016-4423 in the wild and no public exploit code.","fix":"Upgrade symfony/security to a fixed version for your release line: 2.3.41, 2.7.13, 2.8.6 or 3.0.6.","what":"CVE-2016-4423 is a high-severity denial of service vulnerability in Debian Debian Linux, published on 1 Jun 2016. An attacker can exploit it over the internet without logging in, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2016-4423 and fix it if it is affected.\n\nWhat it is: CVE-2016-4423 is a high-severity denial of service vulnerability in Debian Debian Linux, published on 1 Jun 2016. 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-2016-4423 in the wild and no public exploit code.\n\nAffected packages and fixed versions:\n- symfony/security (Packagist): affected from 2.3.0; fixed in 2.3.41\n- symfony/security (Packagist): affected from 2.3.0; fixed in 2.3.41\n- symfony/security (Packagist): affected from 2.4.0; fixed in 2.7.13\n- symfony/security (Packagist): affected from 2.4.0; fixed in 2.7.13\n- symfony/security (Packagist): affected from 2.8.0; fixed in 2.8.6\n- symfony/security (Packagist): affected from 2.8.0; fixed in 2.8.6\n- symfony/security (Packagist): affected from 3.0.0; fixed in 3.0.6\n- symfony/security (Packagist): affected from 3.0.0; fixed in 3.0.6\n- symfony/security-http (Packagist): affected from 2.3.0; fixed in 2.3.41\n- symfony/security-http (Packagist): affected from 2.3.0; fixed in 2.3.41\n- symfony/security-http (Packagist): affected from 2.4.0; fixed in 2.7.13\n- symfony/security-http (Packagist): affected from 2.4.0; fixed in 2.7.13\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-2016-4423/ (Markdown: https://insights.sbomify.com/CVE-2016-4423/index.md)","id":"CVE-2016-4423","markdown":"https://insights.sbomify.com/CVE-2016-4423/index.md","name":"CVE-2016-4423","record":{"aliases":["DEBIAN-CVE-2016-4423","GHSA-whgv-8cg3-7hcm","UBUNTU-CVE-2016-4423"],"analysis":{"component_type":"library","fix_type":"upgrade","impacts":["denial_of_service"],"network_reachable":"yes","non_default_config":false,"product_category":"Symfony security component","requires_auth":"none","summary":"Remote attackers can cause denial of service by exhausting session storage with long usernames during authentication attempts in Symfony.","user_interaction":"not_required","vuln_class":"denial_of_service"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"mitre","cpe":[{"product":"debian_linux","vendor":"debian"},{"product":"symfony","vendor":"sensiolabs"}],"cvss":{"score":7.5,"severity":"high","source":"nvd","vector":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","version":"3.0"},"cwes":[{"id":"CWE-399","name":null}],"description":"The attemptAuthentication function in Component/Security/Http/Firewall/UsernamePasswordFormAuthenticationListener.php in Symfony before 2.3.41, 2.7.x before 2.7.13, 2.8.x before 2.8.6, and 3.0.x before 3.0.6 does not limit the length of a username stored in a session, which allows remote attackers to cause a denial of service (session storage consumption) via a series of authentication attempts with long, non-existent usernames.","ecosystems":["Packagist"],"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":"Symphony Denial of Service Via Overlong Usernames","id":"CVE-2016-4423","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"Packagist","product":"debian:debian_linux","products":["debian:debian_linux","sensiolabs:symfony"],"type":"denial_of_service","year":"2016"},"n_packages":24,"n_references":3,"next":{"headline":"Denial of service in n/a","id":"CVE-2016-4425"},"packages":[{"ecosystem":"Packagist","fixed":["2.3.41"],"introduced":["2.3.0"],"last_affected":[],"package":"symfony/security","purl":null,"source":"GHSA-whgv-8cg3-7hcm"},{"ecosystem":"Packagist","fixed":["2.3.41"],"introduced":["2.3.0"],"last_affected":[],"package":"symfony/security","purl":"pkg:composer/symfony/security","source":"GHSA-whgv-8cg3-7hcm"},{"ecosystem":"Packagist","fixed":["2.7.13"],"introduced":["2.4.0"],"last_affected":[],"package":"symfony/security","purl":null,"source":"GHSA-whgv-8cg3-7hcm"},{"ecosystem":"Packagist","fixed":["2.7.13"],"introduced":["2.4.0"],"last_affected":[],"package":"symfony/security","purl":"pkg:composer/symfony/security","source":"GHSA-whgv-8cg3-7hcm"},{"ecosystem":"Packagist","fixed":["2.8.6"],"introduced":["2.8.0"],"last_affected":[],"package":"symfony/security","purl":null,"source":"GHSA-whgv-8cg3-7hcm"},{"ecosystem":"Packagist","fixed":["2.8.6"],"introduced":["2.8.0"],"last_affected":[],"package":"symfony/security","purl":"pkg:composer/symfony/security","source":"GHSA-whgv-8cg3-7hcm"},{"ecosystem":"Packagist","fixed":["3.0.6"],"introduced":["3.0.0"],"last_affected":[],"package":"symfony/security","purl":null,"source":"GHSA-whgv-8cg3-7hcm"},{"ecosystem":"Packagist","fixed":["3.0.6"],"introduced":["3.0.0"],"last_affected":[],"package":"symfony/security","purl":"pkg:composer/symfony/security","source":"GHSA-whgv-8cg3-7hcm"},{"ecosystem":"Packagist","fixed":["2.3.41"],"introduced":["2.3.0"],"last_affected":[],"package":"symfony/security-http","purl":null,"source":"GHSA-whgv-8cg3-7hcm"},{"ecosystem":"Packagist","fixed":["2.3.41"],"introduced":["2.3.0"],"last_affected":[],"package":"symfony/security-http","purl":"pkg:composer/symfony/security-http","source":"GHSA-whgv-8cg3-7hcm"},{"ecosystem":"Packagist","fixed":["2.7.13"],"introduced":["2.4.0"],"last_affected":[],"package":"symfony/security-http","purl":null,"source":"GHSA-whgv-8cg3-7hcm"},{"ecosystem":"Packagist","fixed":["2.7.13"],"introduced":["2.4.0"],"last_affected":[],"package":"symfony/security-http","purl":"pkg:composer/symfony/security-http","source":"GHSA-whgv-8cg3-7hcm"},{"ecosystem":"Packagist","fixed":["2.8.6"],"introduced":["2.8.0"],"last_affected":[],"package":"symfony/security-http","purl":null,"source":"GHSA-whgv-8cg3-7hcm"},{"ecosystem":"Packagist","fixed":["2.8.6"],"introduced":["2.8.0"],"last_affected":[],"package":"symfony/security-http","purl":"pkg:composer/symfony/security-http","source":"GHSA-whgv-8cg3-7hcm"},{"ecosystem":"Packagist","fixed":["3.0.6"],"introduced":["3.0.0"],"last_affected":[],"package":"symfony/security-http","purl":null,"source":"GHSA-whgv-8cg3-7hcm"},{"ecosystem":"Packagist","fixed":["3.0.6"],"introduced":["3.0.0"],"last_affected":[],"package":"symfony/security-http","purl":"pkg:composer/symfony/security-http","source":"GHSA-whgv-8cg3-7hcm"},{"ecosystem":"Packagist","fixed":["2.3.41"],"introduced":["2.3.0"],"last_affected":[],"package":"symfony/symfony","purl":null,"source":"GHSA-whgv-8cg3-7hcm"},{"ecosystem":"Packagist","fixed":["2.3.41"],"introduced":["2.3.0"],"last_affected":[],"package":"symfony/symfony","purl":"pkg:composer/symfony/symfony","source":"GHSA-whgv-8cg3-7hcm"},{"ecosystem":"Packagist","fixed":["2.7.13"],"introduced":["2.4.0"],"last_affected":[],"package":"symfony/symfony","purl":null,"source":"GHSA-whgv-8cg3-7hcm"},{"ecosystem":"Packagist","fixed":["2.7.13"],"introduced":["2.4.0"],"last_affected":[],"package":"symfony/symfony","purl":"pkg:composer/symfony/symfony","source":"GHSA-whgv-8cg3-7hcm"},{"ecosystem":"Packagist","fixed":["2.8.6"],"introduced":["2.8.0"],"last_affected":[],"package":"symfony/symfony","purl":null,"source":"GHSA-whgv-8cg3-7hcm"},{"ecosystem":"Packagist","fixed":["2.8.6"],"introduced":["2.8.0"],"last_affected":[],"package":"symfony/symfony","purl":"pkg:composer/symfony/symfony","source":"GHSA-whgv-8cg3-7hcm"},{"ecosystem":"Packagist","fixed":["3.0.6"],"introduced":["3.0.0"],"last_affected":[],"package":"symfony/symfony","purl":null,"source":"GHSA-whgv-8cg3-7hcm"},{"ecosystem":"Packagist","fixed":["3.0.6"],"introduced":["3.0.0"],"last_affected":[],"package":"symfony/symfony","purl":"pkg:composer/symfony/symfony","source":"GHSA-whgv-8cg3-7hcm"}],"prev":{"headline":"Auth bypass in n/a","id":"CVE-2016-4422"},"products":["n/a"],"published":"2016-06-01","related":[{"cvss_score":10,"headline":"ProFTPD Improper Access Control","id":"CVE-2015-3306","kev_date_added":"2026-10-08","published":"2015-05-18"},{"cvss_score":9.9,"headline":"RoundCube Webmail Deserialization of Untrusted Data","id":"CVE-2025-49113","kev_date_added":"2026-02-20","published":"2025-06-02"},{"cvss_score":9.8,"headline":"GNU InetUtils Argument Injection","id":"CVE-2026-24061","kev_date_added":"2026-01-26","published":"2026-01-21"},{"cvss_score":9.8,"headline":"Linux Kernel Improper Check for Unusual or Exceptional Conditions","id":"CVE-2025-39682","kev_date_added":"2026-09-18","published":"2025-09-05"},{"cvss_score":9.8,"headline":"Mozilla Firefox Use-After-Free","id":"CVE-2024-9680","kev_date_added":"2024-10-15","published":"2024-10-09"},{"cvss_score":9.8,"headline":"RARLAB UnRAR Directory Traversal","id":"CVE-2022-30333","kev_date_added":"2022-08-09","published":"2022-05-09"},{"cvss_score":9.8,"headline":"Roundcube Webmail SQL Injection","id":"CVE-2021-44026","kev_date_added":"2023-06-22","published":"2021-11-19"}],"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":"2024-08-06","vendors":["n/a"]},"summary":"Remote attackers can cause denial of service by exhausting session storage with long usernames during authentication attempts in Symfony.","url":"https://insights.sbomify.com/CVE-2016-4423/"}