{"answers":{"affected":"It affects 1 product.","exploited":"There is no known exploitation of CVE-2021-21390 in the wild and no public exploit code.","fix":"Upgrade to a fixed version.","what":"CVE-2021-21390 is a medium-severity vulnerability in minio, published on 19 Mar 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-2021-21390 and fix it if it is affected.\n\nWhat it is: CVE-2021-21390 is a medium-severity vulnerability in minio, published on 19 Mar 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-2021-21390 in the wild and no public exploit code.\n\nAffected product: minio. 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-2021-21390/ (Markdown: https://insights.sbomify.com/CVE-2021-21390/index.md)","id":"CVE-2021-21390","markdown":"https://insights.sbomify.com/CVE-2021-21390/index.md","name":"CVE-2021-21390","record":{"aliases":["GHSA-xr7r-7gpj-5pgp","MINI-hm38-f53w-6r44","MINI-w4qj-66qm-r7xw"],"analysis":{"component_type":"server_software","fix_type":"upgrade","impacts":["data_modify"],"network_reachable":"yes","non_default_config":false,"product_category":"Object storage server","requires_auth":"none","summary":"Attackers can modify request bodies during transmission by bypassing chunk signature verification in MinIO object storage.","user_interaction":"required","vuln_class":"other"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"GitHub_M","cpe":[{"product":"minio","vendor":"minio"}],"cvss":{"score":6.5,"severity":"medium","source":"cna","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N","version":"3.1"},"cwes":[{"id":"CWE-924","name":"Improper Enforcement of Message Integrity During Transmission in a Communication Channel"}],"description":"MinIO is an open-source high performance object storage service and it is API compatible with Amazon S3 cloud storage service. In MinIO before version RELEASE.2021-03-17T02-33-02Z, there is a vulnerability which enables MITM modification of request bodies that are meant to have integrity guaranteed by chunk signatures. In a PUT request using aws-chunked encoding, MinIO ordinarily verifies signatures at the end of a chunk. This check can be skipped if the client sends a false chunk size that is much greater than the actual data sent: the server accepts and completes the request without ever reaching the end of the chunk + thereby without ever checking the chunk signature. This is fixed in version RELEASE.2021-03-17T02-33-02Z. As a workaround one can avoid using \"aws-chunked\" encoding-based chunk signature upload requests instead use TLS. MinIO SDKs automatically disable chunked encoding signature when the server endpoint is configured with TLS.","ecosystems":[],"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":"MITM modification of request bodies in MinIO","id":"CVE-2021-21390","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":null,"products":[],"type":"other","year":"2021"},"n_packages":0,"n_references":3,"next":{"headline":"Regular expression Denial of Service in multiple packages","id":"CVE-2021-21391"},"packages":[],"prev":{"headline":"BuddyPress privilege escalation via REST API","id":"CVE-2021-21389"},"products":["minio"],"published":"2021-03-19","related":[{"cvss_score":8.8,"headline":"MinIO Security Feature Bypass","id":"CVE-2023-28434","kev_date_added":"2023-09-19","published":"2023-03-22"},{"cvss_score":7.5,"headline":"MinIO Information Disclosure","id":"CVE-2023-28432","kev_date_added":"2023-04-21","published":"2023-03-22"},{"cvss_score":9.3,"headline":"Authentication bypass MinIO Admin API","id":"CVE-2020-11012","kev_date_added":null,"published":"2020-04-23"},{"cvss_score":9.2,"headline":"MinIO: JWT Algorithm Confusion in OIDC Authentication","id":"CVE-2026-33322","kev_date_added":null,"published":"2026-03-24"},{"cvss_score":9.1,"headline":"MinIO: LDAP login brute-force via user enumeration and missing rate limit","id":"CVE-2026-33419","kev_date_added":null,"published":"2026-03-24"},{"cvss_score":8.8,"headline":"MinIO has an Unauthenticated Object Write via Missing Signature Verification in Unsigned-Trailer Uploads","id":"CVE-2026-40344","kev_date_added":null,"published":"2026-04-22"},{"cvss_score":8.8,"headline":"MinIO has an Unauthenticated Object Write via Query-String Credential Signature Bypass in Unsigned-Trailer Uploads","id":"CVE-2026-41145","kev_date_added":null,"published":"2026-04-22"}],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"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":["minio"]},"summary":"Attackers can modify request bodies during transmission by bypassing chunk signature verification in MinIO object storage.","url":"https://insights.sbomify.com/CVE-2021-21390/"}