{"answers":{"affected":"","exploited":"It is not confirmed as exploited in the wild, but public exploit code for CVE-2021-47740 exists.","fix":"No fix has been published for CVE-2021-47740 yet. Limit exposure of the affected software until one is available.","what":"CVE-2021-47740 is a medium-severity authentication bypass vulnerability in KZ Broadband Technologies, Ltd. AM3000M, published on 31 Dec 2025. An attacker can exploit it over the internet without logging in, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2021-47740 and fix it if it is affected.\n\nWhat it is: CVE-2021-47740 is a medium-severity authentication bypass vulnerability in KZ Broadband Technologies, Ltd. AM3000M, published on 31 Dec 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.\nExploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2021-47740 exists.\n\nAffected product: KZ Broadband Technologies, Ltd. AM3000M. 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-2021-47740/ (Markdown: https://insights.sbomify.com/CVE-2021-47740/index.md)","id":"CVE-2021-47740","markdown":"https://insights.sbomify.com/CVE-2021-47740/index.md","name":"CVE-2021-47740","record":{"aliases":["GHSA-x9rg-7xj6-v2x6"],"analysis":{"component_type":"network_device","fix_type":"no_fix_stated","impacts":["account_takeover","security_bypass"],"network_reachable":"yes","non_default_config":false,"product_category":"4G LTE CPE","requires_auth":"none","summary":"Attackers can reuse expired session credentials to maintain unauthorized access to KZTech 4G LTE CPE devices.","user_interaction":"not_required","vuln_class":"auth_bypass"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"VulnCheck","cpe":[],"cvss":{"score":6.9,"severity":"medium","source":"cna","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N","version":"4.0"},"cwes":[{"id":"CWE-613","name":"DEPRECATED: Insufficient Session Expiration"}],"description":"KZTech JT3500V 4G LTE CPE 2.0.1 contains a session management vulnerability that allows attackers to reuse old session credentials without proper expiration. Attackers can exploit the weak session handling to maintain unauthorized access and potentially compromise device authentication mechanisms.","ecosystems":[],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"weaponised"},"has_fix":null,"headline":"KZTech JT3500V 4G LTE CPE 2.0.1 Insufficient Session Expiration Vulnerability","id":"CVE-2021-47740","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":null,"products":[],"type":"auth_bypass","year":"2021"},"n_packages":0,"n_references":7,"next":{"headline":"ZBL EPON ONU Broadband Router V100R001 Privilege Escalation via Configuration Endpoint","id":"CVE-2021-47741"},"packages":[],"prev":{"headline":"Epic Games Easy Anti-Cheat 4.0 Local Privilege Escalation via Unquoted Service Path","id":"CVE-2021-47739"},"products":["AM3000M","AM3100E","AM3100V","AM3300V","AM3410V","AM3500MW","AM4100V","AM4200M","AM5000W","AM6000N","AM6200M","JT3500V","KZ3120R","KZ3220M","KZ7621U"],"published":"2025-12-31","related":[],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"class":"attribution","licence":"CWE Terms of Use","name":"CWE (MITRE)"},{"class":"attribution","licence":"FIRST CVSS licence","name":"CVSS (FIRST)"}],"ssvc":{"automatable":"yes","exploitation":"poc","technical_impact":"partial"},"state":"PUBLISHED","updated":"2026-01-02","vendors":["KZ Broadband Technologies, Ltd."]},"summary":"Attackers can reuse expired session credentials to maintain unauthorized access to KZTech 4G LTE CPE devices.","url":"https://insights.sbomify.com/CVE-2021-47740/"}