{"answers":{"affected":"5 open source packages ship an affected version, including org.jenkins-ci.main:jenkins-core and jenkins. It affects 1 product.","exploited":"There is no known exploitation of CVE-2021-21671 in the wild and no public exploit code.","fix":"Upgrade org.jenkins-ci.main:jenkins-core to a fixed version for your release line: 2.289.2 or 2.300.","what":"CVE-2021-21671 is a high-severity vulnerability in Jenkins Jenkins, published on 30 Jun 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-2021-21671 and fix it if it is affected.\n\nWhat it is: CVE-2021-21671 is a high-severity vulnerability in Jenkins Jenkins, published on 30 Jun 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-2021-21671 in the wild and no public exploit code.\n\nAffected packages and fixed versions:\n- org.jenkins-ci.main:jenkins-core (Maven): affected all versions; fixed in 2.289.2\n- org.jenkins-ci.main:jenkins-core (Maven): affected all versions; fixed in 2.289.2\n- org.jenkins-ci.main:jenkins-core (Maven): affected from 2.292; fixed in 2.300\n- org.jenkins-ci.main:jenkins-core (Maven): affected from 2.292; fixed in 2.300\n- jenkins (Bitnami): affected from 2.266.0; fixed in 2.300.0\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-2021-21671/ (Markdown: https://insights.sbomify.com/CVE-2021-21671/index.md)","id":"CVE-2021-21671","markdown":"https://insights.sbomify.com/CVE-2021-21671/index.md","name":"CVE-2021-21671","record":{"aliases":["BIT-jenkins-2021-21671","GHSA-4wr9-2xc6-jmg5"],"analysis":{"component_type":"server_software","fix_type":"upgrade","impacts":["account_takeover"],"network_reachable":"yes","non_default_config":false,"product_category":"Jenkins automation server","requires_auth":"none","summary":"Attackers can maintain access via old sessions after a user logs in, potentially leading to account takeover in Jenkins.","user_interaction":"required","vuln_class":"security_feature_bypass"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"jenkins","cpe":[{"product":"jenkins","vendor":"jenkins"}],"cvss":{"score":7.5,"severity":"high","source":"nvd","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H","version":"3.1"},"cwes":[],"description":"Jenkins 2.299 and earlier, LTS 2.289.1 and earlier does not invalidate the previous session on login.","ecosystems":["Bitnami","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":"Session fixation vulnerability in Jenkins","id":"CVE-2021-21671","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"Bitnami","product":"jenkins:jenkins","products":["jenkins:jenkins"],"type":"security_feature_bypass","year":"2021"},"n_packages":5,"n_references":2,"next":{"headline":"XXE vulnerability in Jenkins Selenium HTML report Plugin","id":"CVE-2021-21672"},"packages":[{"ecosystem":"Bitnami","fixed":["2.300.0"],"introduced":["2.266.0"],"last_affected":[],"package":"jenkins","purl":"pkg:bitnami/jenkins","source":"BIT-jenkins-2021-21671"},{"ecosystem":"Maven","fixed":["2.289.2"],"introduced":["0"],"last_affected":[],"package":"org.jenkins-ci.main:jenkins-core","purl":null,"source":"GHSA-4wr9-2xc6-jmg5"},{"ecosystem":"Maven","fixed":["2.289.2"],"introduced":["0"],"last_affected":[],"package":"org.jenkins-ci.main:jenkins-core","purl":"pkg:maven/org.jenkins-ci.main/jenkins-core","source":"GHSA-4wr9-2xc6-jmg5"},{"ecosystem":"Maven","fixed":["2.300"],"introduced":["2.292"],"last_affected":[],"package":"org.jenkins-ci.main:jenkins-core","purl":null,"source":"GHSA-4wr9-2xc6-jmg5"},{"ecosystem":"Maven","fixed":["2.300"],"introduced":["2.292"],"last_affected":[],"package":"org.jenkins-ci.main:jenkins-core","purl":"pkg:maven/org.jenkins-ci.main/jenkins-core","source":"GHSA-4wr9-2xc6-jmg5"}],"prev":{"headline":"Improper permission checks allow canceling queue items and aborting builds in Jenkins","id":"CVE-2021-21670"},"products":["Jenkins"],"published":"2021-06-30","related":[{"cvss_score":9.8,"headline":"Jenkins Command Line Interface (CLI) Path Traversal","id":"CVE-2024-23897","kev_date_added":"2024-08-19","published":"2024-01-24"},{"cvss_score":9.8,"headline":"Jenkins Stapler Web Framework Deserialization of Untrusted Data","id":"CVE-2018-1000861","kev_date_added":"2022-02-10","published":"2018-12-10"},{"cvss_score":9.8,"headline":"Jenkins Remote Code Execution","id":"CVE-2017-1000353","kev_date_added":"2025-10-02","published":"2018-01-29"},{"cvss_score":7.5,"headline":"Jenkins User Interface (UI) Information Disclosure","id":"CVE-2015-5317","kev_date_added":"2023-05-12","published":"2015-11-25"},{"cvss_score":9.8,"headline":"Multiple vulnerabilities allow bypassing path filtering of agent-to-controller access control in Jenkins","id":"CVE-2021-21690","kev_date_added":null,"published":"2021-11-04"},{"cvss_score":9.8,"headline":"Multiple vulnerabilities allow bypassing path filtering of agent-to-controller access control in Jenkins","id":"CVE-2021-21691","kev_date_added":null,"published":"2021-11-04"},{"cvss_score":9.8,"headline":"Multiple vulnerabilities allow bypassing path filtering of agent-to-controller access control in Jenkins","id":"CVE-2021-21692","kev_date_added":null,"published":"2021-11-04"}],"sources":[{"class":"attribution","licence":"Apache-2.0","name":"Bitnami","prefix":"BIT"},{"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":"FIRST CVSS licence","name":"CVSS (FIRST)"}],"ssvc":{"automatable":null,"exploitation":null,"technical_impact":null},"state":"PUBLISHED","updated":"2024-08-03","vendors":["Jenkins project"]},"summary":"Attackers can maintain access via old sessions after a user logs in, potentially leading to account takeover in Jenkins.","url":"https://insights.sbomify.com/CVE-2021-21671/"}