CVE-2021-3512

HIGH

8.8

CVSS Score

Published: April 28, 2021 at 12:45 AM UTC

Updated: June 17, 2026 at 04:05 AM UTC

48 products affected across 1 vendorWzr 600DHP FirmwareWzr 300HP FirmwareHw 450HP Zwe Firmware

Using Buffalo broadband routers by BUFFALO INC.?

Get instant alerts when new vulnerabilities affect Buffalo broadband routers - before attackers find them.

Real-time alertsTrack your software stackFree plan available

Start Free Sign In

Severity

HIGH8.8

Exploit prediction

EPSS 0.9%

Description

Improper access control 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 bypass access restriction and to start telnet service and execute arbitrary OS commands with root privileges via unspecified vectors.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Bhr 4GRV Firmware · Buffalo

95%

v < 2.00

Affected range stops below 2.00, so it looks safe — our inference, not a vendor statement

buffalo-bhr-4grv (same device)

Dwr HP G300NH Firmware · Buffalo

95%

v < 1.84

Affected range stops below 1.84, so it looks safe — our inference, not a vendor statement

buffalo-dwr-hp-g300nh (same device)

Fs 600DHP Firmware · Buffalo

95%

v < 3.40

Affected range stops below 3.40, so it looks safe — our inference, not a vendor statement

buffalo-fs-600dhp (same device)

Fs G300N Firmware · Buffalo

95%

v < 3.14

Affected range stops below 3.14, so it looks safe — our inference, not a vendor statement

buffalo-fs-g300n (same device)

Fs HP G300N Firmware · Buffalo

95%

v < 3.33

Affected range stops below 3.33, so it looks safe — our inference, not a vendor statement

buffalo-fs-hp-g300n (same device)

Fs R600DHP Firmware · Buffalo

95%

v < 3.40

Affected range stops below 3.40, so it looks safe — our inference, not a vendor statement

buffalo-fs-r600dhp (same device)

Hw 450HP Zwe Firmware · Buffalo

95%

v < 2.00

Affected range stops below 2.00, so it looks safe — our inference, not a vendor statement

buffalo-hw-450hp-zwe (same device)

Whr 300 Firmware · Buffalo

95%

v < 2.00

Affected range stops below 2.00, so it looks safe — our inference, not a vendor statement

buffalo-whr-300 (same device)

Whr 300HP Firmware · Buffalo

95%

v < 2.00

Affected range stops below 2.00, so it looks safe — our inference, not a vendor statement

buffalo-whr-300hp (same device)

Whr G301N Firmware · Buffalo

95%

v < 1.87

Affected range stops below 1.87, so it looks safe — our inference, not a vendor statement

buffalo-whr-g301n (same device)

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

https://www.buffalo.jp/news/detail/20210427-01.html

References (2)

x_refsource_MISCThird Party Advisory

Source: [email protected]

https://jvn.jp/en/vu/JVNVU99235714/index.html

x_refsource_MISCVendor Advisory

Source: [email protected]

https://www.buffalo.jp/news/detail/20210427-01.html

CVSS

8.8HIGH[email protected]

Attack Vector: ADJACENT_NETWORK
Complexity: LOW
Privileges: NONE
User Interaction: NONE
Scope: UNCHANGED
Confidentiality: HIGH
Integrity: HIGH
Availability: HIGH

Vector?

Quick Info

StatusMODIFIED

CWE

NVD-CWE-Other

Get alerted

Stop reading CVE feeds looking for your own stack

Track the products you run and VulnTracker tells you when a new CVE affects them — with what is known about fixing it, and nothing about the rest.

Create account Sign in

Free plan, no card