{"answers":{"affected":"1 open source package ship an affected version, including fluent-bit. It affects 1 product.","exploited":"There is no known exploitation of CVE-2021-27186 in the wild and no public exploit code.","fix":"Upgrade fluent-bit to 1.6.11 or later.","what":"CVE-2021-27186 is a high-severity vulnerability in n/a, published on 10 Feb 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-2021-27186 and fix it if it is affected.\n\nWhat it is: CVE-2021-27186 is a high-severity vulnerability in n/a, published on 10 Feb 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-2021-27186 in the wild and no public exploit code.\n\nAffected packages and fixed versions:\n- fluent-bit (Bitnami): affected from 1.6.10; fixed in 1.6.11\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-2021-27186/ (Markdown: https://insights.sbomify.com/CVE-2021-27186/index.md)","id":"CVE-2021-27186","markdown":"https://insights.sbomify.com/CVE-2021-27186/index.md","name":"CVE-2021-27186","record":{"aliases":["BIT-fluent-bit-2021-27186","GHSA-gjm8-qc7w-3xxp"],"analysis":{"component_type":"server_software","fix_type":"upgrade","impacts":["denial_of_service"],"network_reachable":"yes","non_default_config":false,"product_category":"Fluent Bit log processor","requires_auth":"none","summary":"A NULL pointer dereference in Fluent Bit allows attackers to cause a denial of service via unvalidated memory allocation returns.","user_interaction":"not_required","vuln_class":"null_dereference"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"mitre","cpe":[{"product":"fluent_bit","vendor":"treasuredata"}],"cvss":{"score":7.5,"severity":"high","source":"nvd","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","version":"3.1"},"cwes":[{"id":"CWE-476","name":"NULL Pointer Dereference"}],"description":"Fluent Bit 1.6.10 has a NULL pointer dereference when an flb_malloc return value is not validated by flb_avro.c or http_server/api/v1/metrics.c.","ecosystems":["Bitnami"],"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":"Null dereference in n/a","id":"CVE-2021-27186","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"Bitnami","product":null,"products":[],"type":"null_dereference","year":"2021"},"n_packages":1,"n_references":3,"next":{"headline":"Hardcoded credentials in n/a","id":"CVE-2021-27187"},"packages":[{"ecosystem":"Bitnami","fixed":["1.6.11"],"introduced":["1.6.10"],"last_affected":[],"package":"fluent-bit","purl":"pkg:bitnami/fluent-bit","source":"BIT-fluent-bit-2021-27186"}],"prev":{"headline":"Command injection in samba-client","id":"CVE-2021-27185"},"products":["n/a"],"published":"2021-02-10","related":[{"cvss_score":9.8,"headline":"Fluent Bit Memory Corruption Vulnerability","id":"CVE-2024-4323","kev_date_added":null,"published":"2024-05-20"},{"cvss_score":9.8,"headline":"Use after free in n/a","id":"CVE-2021-36088","kev_date_added":null,"published":"2021-07-01"},{"cvss_score":9.1,"headline":"CVE-2025-12977","id":"CVE-2025-12977","kev_date_added":null,"published":"2025-11-24"},{"cvss_score":8.8,"headline":"CVE-2025-12970","id":"CVE-2025-12970","kev_date_added":null,"published":"2025-11-24"},{"cvss_score":7.8,"headline":"Use after free in n/a","id":"CVE-2021-46878","kev_date_added":null,"published":"2023-04-11"},{"cvss_score":7.8,"headline":"Memory corruption in n/a","id":"CVE-2021-46879","kev_date_added":null,"published":"2023-04-11"},{"cvss_score":7.8,"headline":"Memory corruption in n/a","id":"CVE-2020-35963","kev_date_added":null,"published":"2021-01-03"}],"sources":[{"class":"attribution","licence":"Apache-2.0","name":"Bitnami","prefix":"BIT"},{"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":["n/a"]},"summary":"A NULL pointer dereference in Fluent Bit allows attackers to cause a denial of service via unvalidated memory allocation returns.","url":"https://insights.sbomify.com/CVE-2021-27186/"}