{"answers":{"affected":"It affects 1 product.","exploited":"There is no known exploitation of CVE-2021-28809 in the wild and no public exploit code.","fix":"No fix has been published for CVE-2021-28809 yet. Limit exposure of the affected software until one is available.","what":"CVE-2021-28809 is a critical missing authorization vulnerability in QNAP Systems Inc. HBS 3, published on 8 Jul 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-2021-28809 and fix it if it is affected.\n\nWhat it is: CVE-2021-28809 is a critical missing authorization vulnerability in QNAP Systems Inc. HBS 3, published on 8 Jul 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-2021-28809 in the wild and no public exploit code.\n\nAffected product: QNAP Systems Inc. HBS 3. 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-2021-28809/ (Markdown: https://insights.sbomify.com/CVE-2021-28809/index.md)","id":"CVE-2021-28809","markdown":"https://insights.sbomify.com/CVE-2021-28809/index.md","name":"CVE-2021-28809","record":{"aliases":["GHSA-fwr8-wff7-fmxw"],"analysis":{"component_type":"operating_system","fix_type":"upgrade","impacts":["privilege_escalation","code_execution"],"network_reachable":"yes","non_default_config":false,"product_category":"QNAP HBS 3","requires_auth":"none","summary":"Attackers can exploit missing authentication in the RTRR server to compromise the operating system security on affected QNAP devices.","user_interaction":"not_required","vuln_class":"missing_authorization"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"qnap","cpe":[{"product":"hybrid_backup_sync","vendor":"qnap"}],"cvss":{"score":9.8,"severity":"critical","source":"cna","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-749","name":"Exposed Dangerous Method or Function"},{"id":"CWE-306","name":"Missing Authentication for Critical Functionality"},{"id":"CWE-284","name":"Improper Access Control"}],"description":"An improper access control vulnerability has been reported to affect certain legacy versions of HBS 3. If exploited, this vulnerability allows attackers to compromise the security of the operating system.QNAP have already fixed this vulnerability in the following versions of HBS 3: QTS 4.3.6: HBS 3 v3.0.210507 and later QTS 4.3.4: HBS 3 v3.0.210506 and later QTS 4.3.3: HBS 3 v3.0.210506 and later","ecosystems":[],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"none_known"},"has_fix":null,"headline":"Missing Authentication for Critical Function in RTRR Server in HBS3","id":"CVE-2021-28809","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":null,"products":[],"type":"missing_authorization","year":"2021"},"n_packages":0,"n_references":2,"next":{"headline":"Vulnerability in Roon Server","id":"CVE-2021-28810"},"packages":[],"prev":{"headline":"Post-Authentication Reflected XSS Vulnerability in Q'center","id":"CVE-2021-28807"},"products":["HBS 3"],"published":"2021-07-08","related":[{"cvss_score":10,"headline":"QNAP NAS Improper Authorization","id":"CVE-2021-28799","kev_date_added":"2022-03-31","published":"2021-05-13"},{"cvss_score":9.5,"headline":"HBS 3 Hybrid Backup Sync","id":"CVE-2024-50388","kev_date_added":null,"published":"2024-12-06"},{"cvss_score":7,"headline":"HBS 3 Hybrid Backup Sync","id":"CVE-2025-62840","kev_date_added":null,"published":"2026-01-02"},{"cvss_score":7,"headline":"HBS 3 Hybrid Backup Sync","id":"CVE-2025-62842","kev_date_added":null,"published":"2026-01-02"},{"cvss_score":6.3,"headline":"HBS 3 Hybrid Backup Sync","id":"CVE-2024-53695","kev_date_added":null,"published":"2025-03-07"}],"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":"2024-09-17","vendors":["QNAP Systems Inc."]},"summary":"Attackers can exploit missing authentication in the RTRR server to compromise the operating system security on affected QNAP devices.","url":"https://insights.sbomify.com/CVE-2021-28809/"}