CVE-2021-3511: Buffalo Bhr-4grv Firmware

Medium severity, CVSS 4.3. EPSS: 0.5% chance of exploitation in the next 30 days.

Disclosure of sensitive information to an unauthorized user vulnerability in Buffalo broadband routers (BHR-4GRV firmware Ver.1.99 and prior, DWR-HP-G300NH firmware Ver.1.83 and prior, HW-450HP-ZWE firmware Ver.1.99 and prior, WHR-300HP firmware Ver.1.99 and prior, WHR-300 firmware Ver.1.99 and prior, WHR-G301N firmware Ver.1.86 and prior, WHR-HP-G300N firmware Ver.1.99 and prior, WHR-HP-GN firmware Ver.1.86 and prior, WPL-05G300 firmware Ver.1.87 and prior, WZR-450HP-CWT firmware Ver.1.99 and prior, WZR-450HP-UB firmware Ver.1.99 and prior, WZR-HP-AG300H firmware Ver.1.75 and prior, WZR-HP-G300NH firmware Ver.1.83 and prior, WZR-HP-G301NH firmware Ver.1.83 and prior, WZR-HP-G302H firmware Ver.1.85 and prior, WZR-HP-G450H firmware Ver.1.89 and prior, WZR-300HP firmware Ver.1.99 and prior, WZR-450HP firmware Ver.1.99 and prior, WZR-600DHP firmware Ver.1.99 and prior, WZR-D1100H firmware Ver.1.99 and prior, FS-HP-G300N firmware Ver.3.32 and prior, FS-600DHP firmware Ver.3.38 and prior, FS-R600DHP firmware Ver.3.39 and prior, and FS-G300N firmware Ver.3.13 and prior) allows remote unauthenticated attackers to obtain information such as configuration via unspecified vectors.

Affected products

• Buffalo Bhr-4grv Firmware: before 2.00 (fixed in 2.00)
• Buffalo Dwr-HP-g300nh Firmware: before 1.84 (fixed in 1.84)
• Buffalo Fs-600dhp Firmware: before 3.40 (fixed in 3.40)
• Buffalo Fs-g300n Firmware: before 3.14 (fixed in 3.14)
• Buffalo Fs-HP-g300n Firmware: before 3.33 (fixed in 3.33)
• Buffalo Fs-r600dhp Firmware: before 3.40 (fixed in 3.40)
• Buffalo Hw-450hp-Zwe Firmware: before 2.00 (fixed in 2.00)
• Buffalo Whr-300 Firmware: before 2.00 (fixed in 2.00)
• Buffalo Whr-300hp Firmware: before 2.00 (fixed in 2.00)
• Buffalo Whr-g301n Firmware: before 1.87 (fixed in 1.87)
• Buffalo Whr-HP-g300n Firmware: before 2.00 (fixed in 2.00)
• Buffalo Whr-HP-Gn Firmware: before 1.87 (fixed in 1.87)
• Buffalo Wpl-05g300 Firmware: before 1.88 (fixed in 1.88)
• Buffalo Wzr-300hp Firmware: before 2.00 (fixed in 2.00)
• Buffalo Wzr-450hp-Cwt Firmware: before 2.00 (fixed in 2.00)
• Buffalo Wzr-450hp-Ub Firmware: before 2.00 (fixed in 2.00)
• Buffalo Wzr-450hp Firmware: before 2.00 (fixed in 2.00)
• Buffalo Wzr-600dhp Firmware: before 2.00 (fixed in 2.00)
• Buffalo Wzr-d1100h Firmware: before 2.00 (fixed in 2.00)
• Buffalo Wzr-HP-AG300H Firmware: before 1.76 (fixed in 1.76)
• Buffalo Wzr-HP-g300nh Firmware: before 1.84 (fixed in 1.84)
• Buffalo Wzr-HP-g301nh Firmware: before 1.84 (fixed in 1.84)
• Buffalo Wzr-HP-g302h Firmware: before 1.86 (fixed in 1.86)
• Buffalo Wzr-HP-g450h Firmware: before 1.90 (fixed in 1.90)

Published 2021-04-28. Last modified 2026-06-17.