{"answers":{"affected":"2 open source packages ship an affected version, including org.jenkins-ci.plugins:cas-plugin. It affects 1 product.","exploited":"There is no known exploitation of CVE-2021-21673 in the wild and no public exploit code.","fix":"Upgrade org.jenkins-ci.plugins:cas-plugin to 1.6.1 or later.","what":"CVE-2021-21673 is a medium-severity vulnerability in Jenkins CAS Plugin, 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-2021-21673 and fix it if it is affected.\n\nWhat it is: CVE-2021-21673 is a medium-severity vulnerability in Jenkins CAS Plugin, 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-2021-21673 in the wild and no public exploit code.\n\nAffected packages and fixed versions:\n- org.jenkins-ci.plugins:cas-plugin (Maven): affected all versions; fixed in 1.6.1\n- org.jenkins-ci.plugins:cas-plugin (Maven): affected all versions; fixed in 1.6.1\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-2021-21673/ (Markdown: https://insights.sbomify.com/CVE-2021-21673/index.md)","id":"CVE-2021-21673","markdown":"https://insights.sbomify.com/CVE-2021-21673/index.md","name":"CVE-2021-21673","record":{"aliases":["GHSA-2vvr-5757-qp87"],"analysis":{"component_type":"cms_plugin","fix_type":"upgrade","impacts":["security_bypass"],"network_reachable":"yes","non_default_config":false,"product_category":"Jenkins CAS Plugin","requires_auth":"none","summary":"Attackers can exploit improper redirect validation in the Jenkins CAS Plugin to perform phishing attacks by redirecting users to malicious sites.","user_interaction":"required","vuln_class":"open_redirect"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"jenkins","cpe":[{"product":"cas","vendor":"jenkins"}],"cvss":{"score":6.1,"severity":"medium","source":"nvd","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","version":"3.1"},"cwes":[],"description":"Jenkins CAS Plugin 1.6.0 and earlier improperly determines that a redirect URL after login is legitimately pointing to Jenkins, allowing attackers to perform phishing attacks.","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":"Open redirect vulnerability in Jenkins CAS Plugin","id":"CVE-2021-21673","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"Maven","product":null,"products":[],"type":"open_redirect","year":"2021"},"n_packages":2,"n_references":2,"next":{"headline":"Missing permission check in Jenkins requests-plugin Plugin allows viewing pending requests","id":"CVE-2021-21674"},"packages":[{"ecosystem":"Maven","fixed":["1.6.1"],"introduced":["0"],"last_affected":[],"package":"org.jenkins-ci.plugins:cas-plugin","purl":null,"source":"GHSA-2vvr-5757-qp87"},{"ecosystem":"Maven","fixed":["1.6.1"],"introduced":["0"],"last_affected":[],"package":"org.jenkins-ci.plugins:cas-plugin","purl":"pkg:maven/org.jenkins-ci.plugins/cas-plugin","source":"GHSA-2vvr-5757-qp87"}],"prev":{"headline":"XXE vulnerability in Jenkins Selenium HTML report Plugin","id":"CVE-2021-21672"},"products":["Jenkins CAS Plugin"],"published":"2021-06-30","related":[{"cvss_score":8.8,"headline":"Jenkins CAS Plugin Session Fixation vulnerability","id":"CVE-2023-32997","kev_date_added":null,"published":"2023-05-16"},{"cvss_score":5.4,"headline":"Jenkins CAS Plugin Server-Side Request Forgery vulnerability","id":"CVE-2018-1000188","kev_date_added":null,"published":"2018-06-05"}],"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":"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 exploit improper redirect validation in the Jenkins CAS Plugin to perform phishing attacks by redirecting users to malicious sites.","url":"https://insights.sbomify.com/CVE-2021-21673/"}