{"answers":{"affected":"It affects 1 product.","exploited":"There is no known exploitation of CVE-2021-21891 in the wild and no public exploit code.","fix":"No fix has been published for CVE-2021-21891 yet. Limit exposure of the affected software until one is available.","what":"CVE-2021-21891 is a critical memory corruption vulnerability in Lantronix, published on 22 Dec 2021. An attacker needs administrator access to exploit it, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2021-21891 and fix it if it is affected.\n\nWhat it is: CVE-2021-21891 is a critical memory corruption vulnerability in Lantronix, published on 22 Dec 2021. An attacker needs administrator access to exploit it, with no action from the victim.\nExploitation: There is no known exploitation of CVE-2021-21891 in the wild and no public exploit code.\n\nAffected product: Lantronix. 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-2021-21891/ (Markdown: https://insights.sbomify.com/CVE-2021-21891/index.md)","id":"CVE-2021-21891","markdown":"https://insights.sbomify.com/CVE-2021-21891/index.md","name":"CVE-2021-21891","record":{"aliases":["GHSA-c2pc-v7xf-jj54"],"analysis":{"component_type":"network_device","fix_type":"no_fix_stated","impacts":["code_execution"],"network_reachable":"yes","non_default_config":false,"product_category":"Lantronix PremierWave","requires_auth":"high_privilege","summary":"An authenticated attacker can trigger a stack-based buffer overflow in the Web Manager to achieve remote code execution on Lantronix PremierWave devices.","user_interaction":"not_required","vuln_class":"memory_corruption"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"talos","cpe":[{"product":"premierwave_2050_firmware","vendor":"lantronix"}],"cvss":{"score":9.1,"severity":"critical","source":"cna","vector":"CVSS:3.0/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H","version":"3.0"},"cwes":[{"id":"CWE-787","name":"Out-of-bounds Write"},{"id":"CWE-121","name":"Stack-based Buffer Overflow"}],"description":"A stack-based buffer overflow vulnerability exists in the Web Manager FsBrowseClean functionality of Lantronix PremierWave 2050 8.9.0.0R4 (in QEMU). A specially crafted HTTP request can lead to remote code execution in the vulnerable portion of the branch (deletefile). An attacker can make an authenticated HTTP request to trigger this vulnerability.","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":"Memory corruption in Lantronix","id":"CVE-2021-21891","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":null,"products":[],"type":"memory_corruption","year":"2021"},"n_packages":0,"n_references":1,"next":{"headline":"Memory corruption in Lantronix","id":"CVE-2021-21892"},"packages":[],"prev":{"headline":"Memory corruption in Lantronix","id":"CVE-2021-21890"},"products":["Lantronix"],"published":"2021-12-22","related":[{"cvss_score":9.9,"headline":"Command injection in Lantronix","id":"CVE-2021-21872","kev_date_added":null,"published":"2021-12-22"},{"cvss_score":9.9,"headline":"Command injection in Lantronix","id":"CVE-2021-21881","kev_date_added":null,"published":"2021-12-22"},{"cvss_score":9.9,"headline":"Command injection in Lantronix","id":"CVE-2021-21882","kev_date_added":null,"published":"2021-12-22"},{"cvss_score":9.9,"headline":"Command injection in Lantronix","id":"CVE-2021-21883","kev_date_added":null,"published":"2021-12-22"},{"cvss_score":9.9,"headline":"Memory corruption in Lantronix","id":"CVE-2021-21889","kev_date_added":null,"published":"2021-12-22"},{"cvss_score":9.9,"headline":"Memory corruption in Lantronix","id":"CVE-2021-21892","kev_date_added":null,"published":"2021-12-22"},{"cvss_score":9.1,"headline":"Command injection in Lantronix","id":"CVE-2021-21873","kev_date_added":null,"published":"2021-12-22"}],"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":["n/a"]},"summary":"An authenticated attacker can trigger a stack-based buffer overflow in the Web Manager to achieve remote code execution on Lantronix PremierWave devices.","url":"https://insights.sbomify.com/CVE-2021-21891/"}