{"answers":{"affected":"9 open source packages ship an affected version, including k8s.io/kubernetes. It affects 1 product.","exploited":"There is no known exploitation of CVE-2021-25737 in the wild and no public exploit code.","fix":"Upgrade k8s.io/kubernetes to a fixed version for your release line: 1.18.19, 1.19.11, 1.20.7 or 1.21.1.","what":"CVE-2021-25737 is a low-severity server-side request forgery vulnerability in Kubernetes Kubernetes, published on 6 Sep 2021. An attacker needs administrator access to exploit it, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2021-25737 and fix it if it is affected.\n\nWhat it is: CVE-2021-25737 is a low-severity server-side request forgery vulnerability in Kubernetes Kubernetes, published on 6 Sep 2021. An attacker needs administrator access to exploit it, with no action from the victim.\nExploitation: There is no known exploitation of CVE-2021-25737 in the wild and no public exploit code.\n\nAffected packages and fixed versions:\n- k8s.io/kubernetes (Go): affected from 1.16.0; fixed in 1.18.19, 1.19.11, 1.20.7, 1.21.1\n- k8s.io/kubernetes (Go): affected from 1.16.0; fixed in 1.18.19\n- k8s.io/kubernetes (Go): affected from 1.16.0; fixed in 1.18.19\n- k8s.io/kubernetes (Go): affected from 1.19.0; fixed in 1.19.11\n- k8s.io/kubernetes (Go): affected from 1.19.0; fixed in 1.19.11\n- k8s.io/kubernetes (Go): affected from 1.20.0; fixed in 1.20.7\n- k8s.io/kubernetes (Go): affected from 1.20.0; fixed in 1.20.7\n- k8s.io/kubernetes (Go): affected from 1.21.0; fixed in 1.21.1\n- k8s.io/kubernetes (Go): affected from 1.21.0; fixed in 1.21.1\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-2021-25737/ (Markdown: https://insights.sbomify.com/CVE-2021-25737/index.md)","id":"CVE-2021-25737","markdown":"https://insights.sbomify.com/CVE-2021-25737/index.md","name":"CVE-2021-25737","record":{"aliases":["CLEANSTART-2025-VV56547","CLEANSTART-2026-TF89729","DEBIAN-CVE-2021-25737","GHSA-mfv7-gq43-w965","GO-2022-0908"],"analysis":{"component_type":"container_or_infrastructure","fix_type":"patch","impacts":["data_read","security_bypass"],"network_reachable":"yes","non_default_config":false,"product_category":"Kubernetes cluster","requires_auth":"high_privilege","summary":"Attackers can redirect pod traffic to private node networks by bypassing EndpointSlice IP validation, potentially accessing internal services.","user_interaction":"not_required","vuln_class":"ssrf"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"kubernetes","cpe":[{"product":"kubernetes","vendor":"kubernetes"}],"cvss":{"score":2.7,"severity":"low","source":"cna","vector":"CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:N/A:N","version":"3.1"},"cwes":[{"id":"CWE-601","name":"URL Redirection to Untrusted Site"},{"id":"CWE-184","name":"Incomplete List of Disallowed Inputs"}],"description":"A security issue was discovered in Kubernetes where a user may be able to redirect pod traffic to private networks on a Node. Kubernetes already prevents creation of Endpoint IPs in the localhost or link-local range, but the same validation was not performed on EndpointSlice IPs.","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-2021-25737","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"Go","product":"kubernetes:kubernetes","products":["kubernetes:kubernetes"],"type":"ssrf","year":"2021"},"n_packages":9,"n_references":3,"next":{"headline":"Code exec via yaml parsing","id":"CVE-2021-25738"},"packages":[{"ecosystem":"Go","fixed":["1.18.19","1.19.11","1.20.7","1.21.1"],"introduced":["1.16.0","1.19.0","1.20.0","1.21.0"],"last_affected":[],"package":"k8s.io/kubernetes","purl":"pkg:golang/k8s.io/kubernetes","source":"GO-2022-0908"},{"ecosystem":"Go","fixed":["1.18.19"],"introduced":["1.16.0"],"last_affected":[],"package":"k8s.io/kubernetes","purl":null,"source":"GHSA-mfv7-gq43-w965"},{"ecosystem":"Go","fixed":["1.18.19"],"introduced":["1.16.0"],"last_affected":[],"package":"k8s.io/kubernetes","purl":"pkg:golang/k8s.io/kubernetes","source":"GHSA-mfv7-gq43-w965"},{"ecosystem":"Go","fixed":["1.19.11"],"introduced":["1.19.0"],"last_affected":[],"package":"k8s.io/kubernetes","purl":null,"source":"GHSA-mfv7-gq43-w965"},{"ecosystem":"Go","fixed":["1.19.11"],"introduced":["1.19.0"],"last_affected":[],"package":"k8s.io/kubernetes","purl":"pkg:golang/k8s.io/kubernetes","source":"GHSA-mfv7-gq43-w965"},{"ecosystem":"Go","fixed":["1.20.7"],"introduced":["1.20.0"],"last_affected":[],"package":"k8s.io/kubernetes","purl":null,"source":"GHSA-mfv7-gq43-w965"},{"ecosystem":"Go","fixed":["1.20.7"],"introduced":["1.20.0"],"last_affected":[],"package":"k8s.io/kubernetes","purl":"pkg:golang/k8s.io/kubernetes","source":"GHSA-mfv7-gq43-w965"},{"ecosystem":"Go","fixed":["1.21.1"],"introduced":["1.21.0"],"last_affected":[],"package":"k8s.io/kubernetes","purl":null,"source":"GHSA-mfv7-gq43-w965"},{"ecosystem":"Go","fixed":["1.21.1"],"introduced":["1.21.0"],"last_affected":[],"package":"k8s.io/kubernetes","purl":"pkg:golang/k8s.io/kubernetes","source":"GHSA-mfv7-gq43-w965"}],"prev":{"headline":"Windows kube-proxy LoadBalancer contention","id":"CVE-2021-25736"},"products":["Kubernetes"],"published":"2021-09-06","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":"CC BY 4.0","name":"Go Vulnerability Database","prefix":"GO"},{"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":"2024-09-16","vendors":["Kubernetes"]},"summary":"Attackers can redirect pod traffic to private node networks by bypassing EndpointSlice IP validation, potentially accessing internal services.","url":"https://insights.sbomify.com/CVE-2021-25737/"}