{"id":"CVE-2021-20716","url":"https://www.cyber-defence.io/tools/cve/CVE-2021-20716","generatedAt":"2026-10-27T22:32:22.035Z","title":"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,…","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.","published":"2021-04-28T01:15:17.000Z","lastModified":"2026-06-17T03:34:19.000Z","status":"Modified","sourceIdentifier":"vultures@jpcert.or.jp","cvss":{"version":"3.1","score":9.8,"severity":"CRITICAL","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"},"cwe":[],"affected":["buffalo/bhr-4rv firmware","buffalo/fs-g54 firmware","buffalo/wbr2-b11 firmware","buffalo/wbr2-g54 firmware","buffalo/wbr2-g54-kd firmware","buffalo/wbr-b11 firmware","buffalo/wbr-g54 firmware","buffalo/wbr-g54l firmware","buffalo/whr2-a54g54 firmware","buffalo/whr2-g54 firmware","buffalo/whr2-g54v firmware","buffalo/whr3-ag54 firmware","buffalo/whr-g54 firmware","buffalo/whr-g54-nf firmware","buffalo/wla2-g54 firmware","buffalo/wla2-g54c firmware","buffalo/wla-b11 firmware","buffalo/wla-g54 firmware","buffalo/wla-g54c firmware","buffalo/wlah-a54g54 firmware","buffalo/wlah-am54g54 firmware","buffalo/wlah-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/wli-t1-b11 firmware","buffalo/wli-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"],"epss":{"score":0.03179,"percentile":0.87974,"date":"2026-10-26","history":[]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"high","text":"High impact if exploited, but EPSS currently rates exploitation as unlikely (3.18%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit."},"changes":[],"references":[{"url":"https://jvn.jp/en/vu/JVNVU90274525/index.html","tags":["Third Party Advisory"],"source":"vultures@jpcert.or.jp"},{"url":"https://www.buffalo.jp/news/detail/20210427-02.html","tags":["Vendor Advisory"],"source":"vultures@jpcert.or.jp"},{"url":"https://jvn.jp/en/vu/JVNVU90274525/index.html","tags":["Third Party Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://www.buffalo.jp/news/detail/20210427-02.html","tags":["Vendor Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2021-20716","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}