{"answers":{"affected":"2 open source packages ship an affected version, including k8s.io/kubernetes. It affects 1 product.","exploited":"There is no known exploitation of CVE-2021-25740 in the wild and no public exploit code.","fix":"Apply the vendor's patch.","what":"CVE-2021-25740 is a low-severity server-side request forgery vulnerability in Kubernetes Kubernetes, published on 20 Sep 2021. Any signed-in user can exploit it over the network, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2021-25740 and fix it if it is affected.\n\nWhat it is: CVE-2021-25740 is a low-severity server-side request forgery vulnerability in Kubernetes Kubernetes, published on 20 Sep 2021. Any signed-in user can exploit it over the network, with no action from the victim.\nExploitation: There is no known exploitation of CVE-2021-25740 in the wild and no public exploit code.\n\nAffected packages and fixed versions:\n- k8s.io/kubernetes (Go): affected all versions up to 1.22.2; no fix listed\n- k8s.io/kubernetes (Go): affected all versions up to 1.22.2; no fix listed\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-2021-25740/ (Markdown: https://insights.sbomify.com/CVE-2021-25740/index.md)","id":"CVE-2021-25740","markdown":"https://insights.sbomify.com/CVE-2021-25740/index.md","name":"CVE-2021-25740","record":{"aliases":["AZL-89312","DEBIAN-CVE-2021-25740","GHSA-vw47-mr44-3jf9","MINI-2hj8-5mrc-xh8c","MINI-2v84-775m-2c3g","MINI-3256-rwg7-g8xr","MINI-4p86-6c66-43q2","MINI-6g58-rxpp-4g8h","MINI-8mr7-prqp-7fmv","MINI-cx94-p8gq-hj6h","MINI-gfj7-c6gh-425c","MINI-h67m-926v-rhc6","MINI-m4qc-pc8f-gf27","MINI-m594-9cx4-3f3v","MINI-pm5g-pqrw-7hq9","OESA-2022-2139"],"analysis":{"component_type":"container_or_infrastructure","fix_type":"patch","impacts":["security_bypass","data_read"],"network_reachable":"yes","non_default_config":false,"product_category":"Kubernetes cluster","requires_auth":"low_privilege","summary":"Attackers can hijack host network traffic via confused deputy attacks in EndpointSlice validation, bypassing network restrictions.","user_interaction":"not_required","vuln_class":"ssrf"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"kubernetes","cpe":[{"product":"kubernetes","vendor":"kubernetes"}],"cvss":{"score":3.1,"severity":"low","source":"cna","vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N","version":"3.1"},"cwes":[{"id":"CWE-610","name":"Externally Controlled Reference to a Resource in Another Sphere"},{"id":"CWE-441","name":"Unintended Proxy or Intermediary"}],"description":"A security issue was discovered with Kubernetes that could enable users to send network traffic to locations they would otherwise not have access to via a confused deputy attack.","ecosystems":["Go"],"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":"Holes in EndpointSlice Validation Enable Host Network Hijack","id":"CVE-2021-25740","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"Go","product":"kubernetes:kubernetes","products":["kubernetes:kubernetes"],"type":"ssrf","year":"2021"},"n_packages":2,"n_references":4,"next":{"headline":"Symlink Exchange Can Allow Host Filesystem Access","id":"CVE-2021-25741"},"packages":[{"ecosystem":"Go","fixed":[],"introduced":["0"],"last_affected":["1.22.2"],"package":"k8s.io/kubernetes","purl":null,"source":"GHSA-vw47-mr44-3jf9"},{"ecosystem":"Go","fixed":[],"introduced":["0"],"last_affected":["1.22.2"],"package":"k8s.io/kubernetes","purl":"pkg:golang/k8s.io/kubernetes","source":"GHSA-vw47-mr44-3jf9"}],"prev":{"headline":"Code exec via yaml parsing","id":"CVE-2021-25738"},"products":["Kubernetes"],"published":"2021-09-20","related":[{"cvss_score":9.8,"headline":"Privilege Escalation in Kubernetes","id":"CVE-2018-1002105","kev_date_added":null,"published":"2018-12-05"},{"cvss_score":9.8,"headline":"Kubernetes Privilege Escalation","id":"CVE-2017-1000056","kev_date_added":null,"published":"2017-07-13"},{"cvss_score":9.8,"headline":"Authorization bypass in Openshift","id":"CVE-2016-1906","kev_date_added":null,"published":"2016-02-03"},{"cvss_score":8.8,"headline":"Kubernetes - Windows nodes - Insufficient input sanitization leads to privilege escalation","id":"CVE-2023-3676","kev_date_added":null,"published":"2023-10-31"},{"cvss_score":8.8,"headline":"Kubernetes - Windows nodes - Insufficient input sanitization leads to privilege escalation","id":"CVE-2023-3955","kev_date_added":null,"published":"2023-10-31"},{"cvss_score":8.8,"headline":"Symlink Exchange Can Allow Host Filesystem Access","id":"CVE-2021-25741","kev_date_added":null,"published":"2021-09-20"},{"cvss_score":8.8,"headline":"Path traversal in Kubernetes","id":"CVE-2017-1002101","kev_date_added":null,"published":"2018-03-13"}],"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":"2026-06-01","vendors":["Kubernetes"]},"summary":"Attackers can hijack host network traffic via confused deputy attacks in EndpointSlice validation, bypassing network restrictions.","url":"https://insights.sbomify.com/CVE-2021-25740/"}