CVE-2021-3512 Auth bypass in Buffalo broadband routers
Remote unauthenticated attackers can bypass access restrictions to enable telnet and execute arbitrary OS commands with root privileges on Buffalo routers.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2021-3512?
CVE-2021-3512 is a high-severity authentication bypass vulnerability in Buffalo broadband routers, published on 28 Apr 2021. It can only be exploited from the same machine or local network, with no action from the victim.
Official 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.
Which versions are affected by CVE-2021-3512?
It affects 24 products.
Products include Buffalo Bhr-4grv Firmware, Buffalo Dwr-Hp-G300nh Firmware, Buffalo Fs-600dhp Firmware, Buffalo Fs-G300n Firmware, Buffalo Fs-Hp-G300n Firmware, Buffalo Fs-R600dhp Firmware and 18 more.
How do I fix CVE-2021-3512?
No fix has been published for CVE-2021-3512 yet. Limit exposure of the affected software until one is available.
Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.
Is CVE-2021-3512 being exploited?
There is no known exploitation of CVE-2021-3512 in the wild and no public exploit code.
Other vulnerabilities in Buffalo broadband routers
Sources
Also known as GHSA-m7x4-xmjq-8hxp.