CVE-2021-20716

Severity: critical (CVSS 9.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 3.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2021-04-28 · updated 2026-06-17

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.

Affected products

Buffalo Bhr-4Rv Firmware: through 2.55
Buffalo Fs-G54 Firmware: through 2.04
Buffalo Wbr-B11 Firmware: through 2.23
Buffalo Wbr-G54 Firmware: through 2.23
Buffalo Wbr-G54L Firmware: through 2.20
Buffalo Wbr2-B11 Firmware: through 2.32
Buffalo Wbr2-G54-Kd Firmware: through 2.32
Buffalo Wbr2-G54 Firmware: through 2.32
Buffalo Whr-G54-Nf Firmware: through 2.10
Buffalo Whr-G54 Firmware: through 2.16
Buffalo Whr2-A54G54 Firmware: through 2.25
Buffalo Whr2-G54 Firmware: through 2.23
Buffalo Whr2-G54V Firmware: through 2.55
Buffalo Whr3-Ag54 Firmware: through 2.23
Buffalo Wla-B11 Firmware: through 2.20
Buffalo Wla-G54 Firmware: through 2.20
Buffalo Wla-G54C Firmware: through 2.20
Buffalo Wla2-G54 Firmware: through 2.24
Buffalo Wla2-G54C Firmware: through 2.24
Buffalo Wlah-A54G54 Firmware: through 2.54
Buffalo Wlah-Am54G54 Firmware: through 2.54
Buffalo Wlah-G54 Firmware: through 2.54
Buffalo Wli-T1-B11 Firmware: through 2.20
Buffalo Wli-Tx1-G54 Firmware: through 2.20
Buffalo Wli2-Tx1-Ag54 Firmware: through 2.53
Buffalo Wli2-Tx1-Amg54 Firmware: through 2.53
Buffalo Wli2-Tx1-G54 Firmware: through 2.20
Buffalo Wli3-Tx1-Amg54 Firmware: through 2.53
Buffalo Wli3-Tx1-G54 Firmware: through 2.53
Buffalo Wvr-G54-Nf Firmware: through 2.02

References

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