CVE-2021-20090 Arcadyan Buffalo Firmware Path Traversal
Unauthenticated attackers can exploit a path traversal flaw in Buffalo router web interfaces to bypass authentication mechanisms.
- Exploited in the wild
- Since 3 Nov 2021
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2021-20090?
CVE-2021-20090 is a critical path traversal vulnerability in Buffalo WSR-2533DHPL2, Buffalo WSR-2533DHP3, published on 29 Apr 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
A path traversal vulnerability in the web interfaces of Buffalo WSR-2533DHPL2 firmware version <= 1.02 and WSR-2533DHP3 firmware version <= 1.24 could allow unauthenticated remote attackers to bypass authentication.
Weakness: CWE-22
Which versions are affected by CVE-2021-20090?
It affects 2 products.
Products include Buffalo Wsr-2533dhp3-Bk Firmware, Buffalo Wsr-2533dhpl2-Bk Firmware.
How do I fix CVE-2021-20090?
No fix has been published for CVE-2021-20090 yet. Limit exposure of the affected software until one is available. US federal agencies must fix it by 17 Nov 2021.
Upgrade, and resolve every user-supplied path against an allowed base folder before opening it. More about Path traversal.
Is CVE-2021-20090 being exploited?
Yes. Attackers have exploited CVE-2021-20090 in the wild since at least 3 Nov 2021.
Public exploit code: 1 Nuclei template.
Other vulnerabilities in Buffalo WSR-2533DHPL2, Buffalo WSR-2533DHP3
Sources
Also known as GHSA-6466-44wr-c6vv.