{"answers":{"affected":"It affects 1 product.","exploited":"There is no known exploitation of CVE-2021-39509 in the wild and no public exploit code.","fix":"No fix has been published for CVE-2021-39509 yet. Limit exposure of the affected software until one is available.","what":"CVE-2021-39509 is a critical command injection vulnerability in Dlink Dir-816 Firmware, published on 24 Aug 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-2021-39509 and fix it if it is affected.\n\nWhat it is: CVE-2021-39509 is a critical command injection vulnerability in Dlink Dir-816 Firmware, published on 24 Aug 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-2021-39509 in the wild and no public exploit code.\n\nAffected product: Dlink Dir-816 Firmware. 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-2021-39509/ (Markdown: https://insights.sbomify.com/CVE-2021-39509/index.md)","id":"CVE-2021-39509","markdown":"https://insights.sbomify.com/CVE-2021-39509/index.md","name":"CVE-2021-39509","record":{"aliases":["GHSA-xvjj-gv4g-2h8h"],"analysis":{"component_type":"network_device","fix_type":"no_fix_stated","impacts":["code_execution"],"network_reachable":"yes","non_default_config":false,"product_category":"D-Link router","requires_auth":"none","summary":"Attackers can execute arbitrary commands on D-Link DIR-816 routers via shell metacharacters in the HTTP request parameter.","user_interaction":"not_required","vuln_class":"command_injection"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"mitre","cpe":[{"product":"dir-816_firmware","vendor":"dlink"}],"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-77","name":"Improper Neutralization of Special Elements used in a Command"}],"description":"An issue was discovered in D-Link DIR-816 DIR-816A2_FWv1.10CNB05_R1B011D88210 The HTTP request parameter is used in the handler function of /goform/form2userconfig.cgi route, which can construct the user name string to delete the user function. This can lead to command injection through shell metacharacters.","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":"Command injection in n/a","id":"CVE-2021-39509","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":"dlink:dir-816_firmware","products":["dlink:dir-816_firmware"],"type":"command_injection","year":"2021"},"n_packages":0,"n_references":3,"next":{"headline":"Command injection in n/a","id":"CVE-2021-39510"},"packages":[],"prev":{"headline":"Code injection in n/a","id":"CVE-2021-39503"},"products":["n/a"],"published":"2021-08-24","related":[{"cvss_score":9.8,"headline":"Command injection in n/a","id":"CVE-2025-45931","kev_date_added":null,"published":"2025-06-30"},{"cvss_score":9.8,"headline":"Missing authorization in n/a","id":"CVE-2024-57684","kev_date_added":null,"published":"2025-01-16"},{"cvss_score":9.8,"headline":"Command injection in n/a","id":"CVE-2023-24331","kev_date_added":null,"published":"2024-02-21"},{"cvss_score":9.8,"headline":"Command injection in n/a","id":"CVE-2024-24321","kev_date_added":null,"published":"2024-02-08"},{"cvss_score":9.8,"headline":"Command injection in n/a","id":"CVE-2023-39637","kev_date_added":null,"published":"2023-09-12"},{"cvss_score":9.8,"headline":"Memory corruption in n/a","id":"CVE-2022-42998","kev_date_added":null,"published":"2022-10-26"},{"cvss_score":9.8,"headline":"Memory corruption in n/a","id":"CVE-2022-43000","kev_date_added":null,"published":"2022-10-26"}],"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":"2024-08-04","vendors":["n/a"]},"summary":"Attackers can execute arbitrary commands on D-Link DIR-816 routers via shell metacharacters in the HTTP request parameter.","url":"https://insights.sbomify.com/CVE-2021-39509/"}