{"answers":{"affected":"It affects 2 products.","exploited":"There is no known exploitation of CVE-2021-20855 in the wild and no public exploit code.","fix":"No fix has been published for CVE-2021-20855 yet. Limit exposure of the affected software until one is available.","what":"CVE-2021-20855 is a medium-severity cross-site scripting vulnerability in ELECOM LAN routers, published on 1 Dec 2021. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link."},"fix_prompt":"Check this codebase for CVE-2021-20855 and fix it if it is affected.\n\nWhat it is: CVE-2021-20855 is a medium-severity cross-site scripting vulnerability in ELECOM LAN routers, published on 1 Dec 2021. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.\nExploitation: There is no known exploitation of CVE-2021-20855 in the wild and no public exploit code.\n\nAffected product: ELECOM LAN routers. 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-2021-20855/ (Markdown: https://insights.sbomify.com/CVE-2021-20855/index.md)","id":"CVE-2021-20855","markdown":"https://insights.sbomify.com/CVE-2021-20855/index.md","name":"CVE-2021-20855","record":{"aliases":["GHSA-9cr9-j2r9-7m87"],"analysis":{"component_type":"network_device","fix_type":"upgrade","impacts":["code_execution","security_bypass"],"network_reachable":"yes","non_default_config":false,"product_category":"ELECOM LAN router","requires_auth":"low_privilege","summary":"Remote authenticated attackers can inject arbitrary scripts into ELECOM LAN routers, potentially compromising user sessions or device integrity.","user_interaction":"required","vuln_class":"xss"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"jpcert","cpe":[{"product":"wrh-733gbk_firmware","vendor":"elecom"},{"product":"wrh-733gwh_firmware","vendor":"elecom"}],"cvss":{"score":5.4,"severity":"medium","source":"nvd","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N","version":"3.1"},"cwes":[{"id":"CWE-79","name":"Improper Neutralization of Input During Web Page Generation"}],"description":"Cross-site scripting vulnerability in ELECOM LAN routers (WRH-733GBK firmware v1.02.9 and prior and WRH-733GWH firmware v1.02.9 and prior) allows a remote authenticated attacker to inject an arbitrary script via unspecified vectors.","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":"Cross-site scripting in ELECOM LAN routers","id":"CVE-2021-20855","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":null,"products":[],"type":"xss","year":"2021"},"n_packages":0,"n_references":2,"next":{"headline":"Cross-site scripting in ELECOM LAN routers","id":"CVE-2021-20856"},"packages":[],"prev":{"headline":"Command injection in ELECOM LAN routers","id":"CVE-2021-20854"},"products":["ELECOM LAN routers"],"published":"2021-12-01","related":[{"cvss_score":6.8,"headline":"Command injection in ELECOM LAN routers","id":"CVE-2021-20852","kev_date_added":null,"published":"2021-12-01"},{"cvss_score":6.8,"headline":"Command injection in ELECOM LAN routers","id":"CVE-2021-20853","kev_date_added":null,"published":"2021-12-01"},{"cvss_score":6.8,"headline":"Command injection in ELECOM LAN routers","id":"CVE-2021-20854","kev_date_added":null,"published":"2021-12-01"},{"cvss_score":5.4,"headline":"Cross-site scripting in ELECOM LAN routers","id":"CVE-2021-20856","kev_date_added":null,"published":"2021-12-01"}],"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":["ELECOM CO.,LTD."]},"summary":"Remote authenticated attackers can inject arbitrary scripts into ELECOM LAN routers, potentially compromising user sessions or device integrity.","url":"https://insights.sbomify.com/CVE-2021-20855/"}