{"answers":{"affected":"It affects 1 product.","exploited":"There is no known exploitation of CVE-2021-31921 in the wild and no public exploit code.","fix":"Upgrade to a fixed version.","what":"CVE-2021-31921 is a critical missing authorization vulnerability in n/a, published on 2 Jun 2021. An attacker can exploit it over the internet without logging in, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2021-31921 and fix it if it is affected.\n\nWhat it is: CVE-2021-31921 is a critical missing authorization vulnerability in n/a, published on 2 Jun 2021. 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-2021-31921 in the wild and no public exploit code.\n\nAffected product: n/a. No package-level version data is available, so check the vendor advisory linked from the reference page.\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-2021-31921/ (Markdown: https://insights.sbomify.com/CVE-2021-31921/index.md)","id":"CVE-2021-31921","markdown":"https://insights.sbomify.com/CVE-2021-31921/index.md","name":"CVE-2021-31921","record":{"aliases":["GHSA-3j84-jghj-gqwg","RHSA-2021:2061","RHSA-2021:2085"],"analysis":{"component_type":"cloud_service","fix_type":"upgrade","impacts":["security_bypass","data_read"],"network_reachable":"yes","non_default_config":true,"product_category":"Istio service mesh","requires_auth":"none","summary":"Attackers can bypass authorization checks to access unexpected cluster services when AUTO_PASSTHROUGH routing is configured.","user_interaction":"not_required","vuln_class":"missing_authorization"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"mitre","cpe":[{"product":"istio","vendor":"istio"}],"cvss":{"score":9.8,"severity":"critical","source":"nvd","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","version":"3.1"},"cwes":[{"id":"CWE-862","name":"Missing Authorization"}],"description":"Istio before 1.8.6 and 1.9.x before 1.9.5 contains a remotely exploitable vulnerability where an external client can access unexpected services in the cluster, bypassing authorization checks, when a gateway is configured with AUTO_PASSTHROUGH routing configuration.","ecosystems":["Red Hat:service_mesh:1.1::el8","Red Hat:service_mesh:2.0::el8"],"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":"Missing authorization in n/a","id":"CVE-2021-31921","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":null,"products":[],"type":"missing_authorization","year":"2021"},"n_packages":15,"n_references":1,"next":{"headline":"Other in n/a","id":"CVE-2021-31922"},"packages":[{"ecosystem":"Red Hat:service_mesh:1.1::el8","fixed":["0:1.1.15-4.el8"],"introduced":["0"],"last_affected":[],"package":"servicemesh","purl":"pkg:rpm/redhat/servicemesh","source":"RHSA-2021:2085"},{"ecosystem":"Red Hat:service_mesh:1.1::el8","fixed":["0:1.1.15-4.el8"],"introduced":["0"],"last_affected":[],"package":"servicemesh-citadel","purl":"pkg:rpm/redhat/servicemesh-citadel","source":"RHSA-2021:2085"},{"ecosystem":"Red Hat:service_mesh:1.1::el8","fixed":["0:1.1.15-4.el8"],"introduced":["0"],"last_affected":[],"package":"servicemesh-galley","purl":"pkg:rpm/redhat/servicemesh-galley","source":"RHSA-2021:2085"},{"ecosystem":"Red Hat:service_mesh:1.1::el8","fixed":["0:1.1.15-4.el8"],"introduced":["0"],"last_affected":[],"package":"servicemesh-istioctl","purl":"pkg:rpm/redhat/servicemesh-istioctl","source":"RHSA-2021:2085"},{"ecosystem":"Red Hat:service_mesh:1.1::el8","fixed":["0:1.1.15-4.el8"],"introduced":["0"],"last_affected":[],"package":"servicemesh-mixc","purl":"pkg:rpm/redhat/servicemesh-mixc","source":"RHSA-2021:2085"},{"ecosystem":"Red Hat:service_mesh:1.1::el8","fixed":["0:1.1.15-4.el8"],"introduced":["0"],"last_affected":[],"package":"servicemesh-mixs","purl":"pkg:rpm/redhat/servicemesh-mixs","source":"RHSA-2021:2085"},{"ecosystem":"Red Hat:service_mesh:1.1::el8","fixed":["0:1.1.15-4.el8"],"introduced":["0"],"last_affected":[],"package":"servicemesh-pilot-agent","purl":"pkg:rpm/redhat/servicemesh-pilot-agent","source":"RHSA-2021:2085"},{"ecosystem":"Red Hat:service_mesh:1.1::el8","fixed":["0:1.1.15-4.el8"],"introduced":["0"],"last_affected":[],"package":"servicemesh-pilot-discovery","purl":"pkg:rpm/redhat/servicemesh-pilot-discovery","source":"RHSA-2021:2085"},{"ecosystem":"Red Hat:service_mesh:1.1::el8","fixed":["0:1.1.15-4.el8"],"introduced":["0"],"last_affected":[],"package":"servicemesh-sidecar-injector","purl":"pkg:rpm/redhat/servicemesh-sidecar-injector","source":"RHSA-2021:2085"},{"ecosystem":"Red Hat:service_mesh:2.0::el8","fixed":["0:2.0.5-3.el8"],"introduced":["0"],"last_affected":[],"package":"servicemesh","purl":"pkg:rpm/redhat/servicemesh","source":"RHSA-2021:2061"},{"ecosystem":"Red Hat:service_mesh:2.0::el8","fixed":["0:2.0.5-3.el8"],"introduced":["0"],"last_affected":[],"package":"servicemesh-istioctl","purl":"pkg:rpm/redhat/servicemesh-istioctl","source":"RHSA-2021:2061"},{"ecosystem":"Red Hat:service_mesh:2.0::el8","fixed":["0:2.0.5-3.el8"],"introduced":["0"],"last_affected":[],"package":"servicemesh-mixc","purl":"pkg:rpm/redhat/servicemesh-mixc","source":"RHSA-2021:2061"},{"ecosystem":"Red Hat:service_mesh:2.0::el8","fixed":["0:2.0.5-3.el8"],"introduced":["0"],"last_affected":[],"package":"servicemesh-mixs","purl":"pkg:rpm/redhat/servicemesh-mixs","source":"RHSA-2021:2061"},{"ecosystem":"Red Hat:service_mesh:2.0::el8","fixed":["0:2.0.5-3.el8"],"introduced":["0"],"last_affected":[],"package":"servicemesh-pilot-agent","purl":"pkg:rpm/redhat/servicemesh-pilot-agent","source":"RHSA-2021:2061"},{"ecosystem":"Red Hat:service_mesh:2.0::el8","fixed":["0:2.0.5-3.el8"],"introduced":["0"],"last_affected":[],"package":"servicemesh-pilot-discovery","purl":"pkg:rpm/redhat/servicemesh-pilot-discovery","source":"RHSA-2021:2061"}],"prev":{"headline":"Security feature bypass in n/a","id":"CVE-2021-31920"},"products":["n/a"],"published":"2021-06-02","related":[{"cvss_score":8.8,"headline":"Information disclosure in n/a","id":"CVE-2021-34824","kev_date_added":null,"published":"2021-06-29"},{"cvss_score":8.7,"headline":"Istio JWKS resolver to prevent private key material from being exposed when JWKS fetch fails.","id":"CVE-2026-31837","kev_date_added":null,"published":"2026-03-10"},{"cvss_score":8.3,"headline":"Authorization Policy Bypass Due to Case Insensitive Host Comparison","id":"CVE-2021-39155","kev_date_added":null,"published":"2021-08-24"},{"cvss_score":8.1,"headline":"Fragments in Path May Lead to Authorization Policy Bypass","id":"CVE-2021-39156","kev_date_added":null,"published":"2021-08-24"},{"cvss_score":7.6,"headline":"Istio may allow identity impersonation if user has localhost access","id":"CVE-2022-39388","kev_date_added":null,"published":"2022-11-10"},{"cvss_score":7.5,"headline":"Istio vulnerable to denial of service attack due to Golang Regex Library","id":"CVE-2022-39278","kev_date_added":null,"published":"2022-10-13"}],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"class":"attribution","licence":"CC BY 4.0","name":"Red Hat","prefix":"RHSA"},{"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":"2024-08-03","vendors":["n/a"]},"summary":"Attackers can bypass authorization checks to access unexpected cluster services when AUTO_PASSTHROUGH routing is configured.","url":"https://insights.sbomify.com/CVE-2021-31921/"}