{"cve":"CVE-2021-20716","nvd":{"published":"2021-04-28T01:15:17.107","modified":"2026-06-17T03:34:18.557","status":"Modified","description":"Hidden functionality in multiple Buffalo network devices (BHR-4RV firmware Ver.2.55 and prior, FS-G54 firmware Ver.2.04 and prior, WBR2-B11 firmware Ver.2.32 and prior, WBR2-G54 firmware Ver.2.32 and prior, WBR2-G54-KD firmware Ver.2.32 and prior, WBR-B11 firmware Ver.2.23 and prior, WBR-G54 firmware Ver.2.23 and prior, WBR-G54L firmware Ver.2.20 and prior, WHR2-A54G54 firmware Ver.2.25 and prior, WHR2-G54 firmware Ver.2.23 and prior, WHR2-G54V firmware Ver.2.55 and prior, WHR3-AG54 firmware Ver.2.23 and prior, WHR-G54 firmware Ver.2.16 and prior, WHR-G54-NF firmware Ver.2.10 and prior, WLA2-G54 firmware Ver.2.24 and prior, WLA2-G54C firmware Ver.2.24 and prior, WLA-B11 firmware Ver.2.20 and prior, WLA-G54 firmware Ver.2.20 and prior, WLA-G54C firmware Ver.2.20 and prior, WLAH-A54G54 firmware Ver.2.54 and prior, WLAH-AM54G54 firmware Ver.2.54 and prior, WLAH-G54 firmware Ver.2.54 and prior, WLI2-TX1-AG54 firmware Ver.2.53 and prior, WLI2-TX1-AMG54 firmware Ver.2.53 and prior, WLI2-TX1-G54 firmware Ver.2.20 and prior, WLI3-TX1-AMG54 firmware Ver.2.53 and prior, WLI3-TX1-G54 firmware Ver.2.53 and prior, WLI-T1-B11 firmware Ver.2.20 and prior, WLI-TX1-G54 firmware Ver.2.20 and prior, WVR-G54-NF firmware Ver.2.02 and prior, WZR-G108 firmware Ver.2.41 and prior, WZR-G54 firmware Ver.2.41 and prior, WZR-HP-G54 firmware Ver.2.41 and prior, WZR-RS-G54 firmware Ver.2.55 and prior, and WZR-RS-G54HP firmware Ver.2.55 and prior) allows a remote attacker to enable the debug option and to execute arbitrary code or OS commands, change the configuration, and cause a denial of service (DoS) condition.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","score":9.8},"cwes":[],"references":["https://jvn.jp/en/vu/JVNVU90274525/index.html","https://www.buffalo.jp/news/detail/20210427-02.html","https://jvn.jp/en/vu/JVNVU90274525/index.html","https://www.buffalo.jp/news/detail/20210427-02.html"],"products":["buffalo:bhr-4rv_firmware","buffalo:fs-g54_firmware","buffalo:wbr-b11_firmware","buffalo:wbr-g54_firmware","buffalo:wbr-g54l_firmware","buffalo:wbr2-b11_firmware","buffalo:wbr2-g54-kd_firmware","buffalo:wbr2-g54_firmware","buffalo:whr-g54-nf_firmware","buffalo:whr-g54_firmware","buffalo:whr2-a54g54_firmware","buffalo:whr2-g54_firmware","buffalo:whr2-g54v_firmware","buffalo:whr3-ag54_firmware","buffalo:wla-b11_firmware","buffalo:wla-g54_firmware","buffalo:wla-g54c_firmware","buffalo:wla2-g54_firmware","buffalo:wla2-g54c_firmware","buffalo:wlah-a54g54_firmware","buffalo:wlah-am54g54_firmware","buffalo:wlah-g54_firmware","buffalo:wli-t1-b11_firmware","buffalo:wli-tx1-g54_firmware","buffalo:wli2-tx1-ag54_firmware","buffalo:wli2-tx1-amg54_firmware","buffalo:wli2-tx1-g54_firmware","buffalo:wli3-tx1-amg54_firmware","buffalo:wli3-tx1-g54_firmware","buffalo:wvr-g54-nf_firmware","buffalo:wzr-g108_firmware","buffalo:wzr-g54_firmware","buffalo:wzr-hp-g54_firmware","buffalo:wzr-rs-g54_firmware","buffalo:wzr-rs-g54hp_firmware"],"source":"nvd","synced_at":"2026-10-19T21:18:09.669877188+00:00"},"epss":{"cve":"CVE-2021-20716","score":0.03179,"percentile":0.88065,"date":"2026-11-01"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}