{"answers":{"affected":"It affects 1 product.","exploited":"There is no known exploitation of CVE-2021-21739 in the wild and no public exploit code.","fix":"No fix has been published for CVE-2021-21739 yet. Limit exposure of the affected software until one is available.","what":"CVE-2021-21739 is a medium-severity vulnerability in \u003cZXCTN 6120H\u003e, published on 5 Aug 2021. It can only be exploited from the same machine or local network, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2021-21739 and fix it if it is affected.\n\nWhat it is: CVE-2021-21739 is a medium-severity vulnerability in \u003cZXCTN 6120H\u003e, published on 5 Aug 2021. It can only be exploited from the same machine or local network, with no action from the victim.\nExploitation: There is no known exploitation of CVE-2021-21739 in the wild and no public exploit code.\n\nAffected product: \u003cZXCTN 6120H\u003e. 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-2021-21739/ (Markdown: https://insights.sbomify.com/CVE-2021-21739/index.md)","id":"CVE-2021-21739","markdown":"https://insights.sbomify.com/CVE-2021-21739/index.md","name":"CVE-2021-21739","record":{"aliases":["GHSA-2r85-x553-vqw2"],"analysis":{"component_type":"network_device","fix_type":"no_fix_stated","impacts":["security_bypass"],"network_reachable":"adjacent_or_local","non_default_config":false,"product_category":"ZTE transport network access","requires_auth":"none","summary":"Attackers can bypass authentication by replacing authenticated optical modules with unauthenticated ones, affecting signal transmission integrity.","user_interaction":"not_required","vuln_class":"security_feature_bypass"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"zte","cpe":[{"product":"zxctn_6120h_firmware","vendor":"zte"}],"cvss":{"score":4.6,"severity":"medium","source":"nvd","vector":"CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N","version":"3.1"},"cwes":[{"id":"CWE-345","name":"Insufficient Verification of Data Authenticity"}],"description":"A ZTE's product of the transport network access layer has a security vulnerability. Because the system does not sufficiently verify the data reliability, attackers could replace an authenticated optical module on the equipment with an unauthenticated one, bypassing system authentication and detection, thus affecting signal transmission. This affects: \u003cZXCTN 6120H\u003e\u003cV5.10.00B24\u003e","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":"Security feature bypass in \u003cZXCTN 6120H\u003e","id":"CVE-2021-21739","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":null,"products":[],"type":"security_feature_bypass","year":"2021"},"n_packages":0,"n_references":1,"next":{"headline":"Path traversal in ZXHN H2640","id":"CVE-2021-21740"},"packages":[],"prev":{"headline":"Cross-site scripting in \u003cZXIPTV\u003e","id":"CVE-2021-21738"},"products":["\u003cZXCTN 6120H\u003e"],"published":"2021-08-05","related":[],"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":"Attackers can bypass authentication by replacing authenticated optical modules with unauthenticated ones, affecting signal transmission integrity.","url":"https://insights.sbomify.com/CVE-2021-21739/"}