{"answers":{"affected":"","exploited":"It is not confirmed as exploited in the wild, but public exploit code for CVE-2021-47741 exists.","fix":"No fix has been published for CVE-2021-47741 yet. Limit exposure of the affected software until one is available.","what":"CVE-2021-47741 is a high-severity vulnerability in Zblchina ZBL EPON ONU Broadband Router, published on 31 Dec 2025. Any signed-in user can exploit it over the network, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2021-47741 and fix it if it is affected.\n\nWhat it is: CVE-2021-47741 is a high-severity vulnerability in Zblchina ZBL EPON ONU Broadband Router, published on 31 Dec 2025. Any signed-in user can exploit it over the network, with no action from the victim.\nExploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2021-47741 exists.\n\nAffected product: Zblchina ZBL EPON ONU Broadband Router. 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-2021-47741/ (Markdown: https://insights.sbomify.com/CVE-2021-47741/index.md)","id":"CVE-2021-47741","markdown":"https://insights.sbomify.com/CVE-2021-47741/index.md","name":"CVE-2021-47741","record":{"aliases":["GHSA-chph-r4jm-2932"],"analysis":{"component_type":"network_device","fix_type":"no_fix_stated","impacts":["privilege_escalation","data_read"],"network_reachable":"yes","non_default_config":false,"product_category":"EPON ONU Broadband Router","requires_auth":"low_privilege","summary":"Limited administrative users can escalate privileges by accessing configuration endpoints to disclose the super user password on ZBL EPON ONU Broadband Routers.","user_interaction":"not_required","vuln_class":"privilege_escalation"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"VulnCheck","cpe":[],"cvss":{"score":8.7,"severity":"high","source":"cna","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N","version":"4.0"},"cwes":[{"id":"CWE-522","name":"Insufficiently Protected Credentials"}],"description":"ZBL EPON ONU Broadband Router V100R001 contains a privilege escalation vulnerability that allows limited administrative users to elevate access by sending requests to configuration endpoints. Attackers can exploit the vulnerability by accessing the configuration backup or password page to disclose the super user password and gain additional privileged functionalities.","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":"ZBL EPON ONU Broadband Router V100R001 Privilege Escalation via Configuration Endpoint","id":"CVE-2021-47741","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":null,"products":[],"type":"privilege_escalation","year":"2021"},"n_packages":0,"n_references":5,"next":{"headline":"Epic Games Psyonix Rocket League \u003c=1.95 Elevation of Privileges via Insecure Permissions","id":"CVE-2021-47742"},"packages":[],"prev":{"headline":"KZTech JT3500V 4G LTE CPE 2.0.1 Insufficient Session Expiration Vulnerability","id":"CVE-2021-47740"},"products":["ZBL EPON ONU Broadband Router"],"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":"no","exploitation":"poc","technical_impact":"total"},"state":"PUBLISHED","updated":"2026-01-02","vendors":["Zblchina"]},"summary":"Limited administrative users can escalate privileges by accessing configuration endpoints to disclose the super user password on ZBL EPON ONU Broadband Routers.","url":"https://insights.sbomify.com/CVE-2021-47741/"}