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Vulnerability record · CVE-2021-3511 · published 28 April 2021

CVE-2021-3511: Buffalo bhr-4grv firmware vulnerability

Buffalo · Bhr 4grv Firmware

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.

4.3 CVSS 3.1 Medium EPSS 0.51% · top 58.2%
4.3CVSS 3.1 base score, v2 3.3
0.51%EPSS exploitation probability, 30 days
NoNot in CISA KEV
24Affected product versions listed by NVD
4References
17 Jun 2026Last modified by NVD

Description

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.

CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

Affected products

24 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://jvn.jp/en/vu/JVNVU99235714/index.html Third Party Advisory
https://www.buffalo.jp/news/detail/20210427-01.html Vendor Advisory
https://jvn.jp/en/vu/JVNVU99235714/index.html Third Party Advisory
https://www.buffalo.jp/news/detail/20210427-01.html Vendor Advisory

Track CVE-2021-3511 inside VULONE

Watch it alongside the ransomware crews, C2 infrastructure and forum chatter that reference it, query it through the API and pull it into your SIEM over TAXII.

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

8.8CVE-2022-40966Buffalo wcr-300 firmware improper authentication vulnerabilityAuthentication bypass vulnerability in multiple Buffalo network devices allows a network-adjacent attacker to bypass authentication and access the de…EPSS 0.35%8.8CVE-2021-3512Buffalo bhr-4grv firmware vulnerabilityImproper access control vulnerability in Buffalo broadband routers (BHR-4GRV firmware Ver.1.99 and prior, DWR-HP-G300NH firmware Ver.1.83 and prior, …EPSS 0.86%6.8CVE-2022-39044Buffalo wcr-300 firmware vulnerabilityHidden functionality vulnerability in multiple Buffalo network devices allows a network-adjacent attacker with an administrative privilege to execute…EPSS 0.33%6.5CVE-2016-4816Buffalo wzr-600dhp3 firmware information exposure vulnerabilityBUFFALO WZR-600DHP3 devices with firmware 2.16 and earlier and WZR-S600DHP devices allow remote attackers to discover credentials and other sensitive…EPSS 1.4%

Source: NIST National Vulnerability Database (record CVE-2021-3511), CISA KEV, FIRST EPSS (scores of 2026-10-11). This page is refreshed as NVD updates the record.