Path traversal in WSR-2533DHPL2 and WSR-2533DHP3 - CVE-2021-20090
Published: April 27, 2021 / Updated: October 25, 2024
Vulnerability identifier: #VU52635
CSH Severity: Critical
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:A/U:Red
CVE-ID: CVE-2021-20090
CWE-ID: CWE-22
Exploitation vector: Remote access
Exploit availability:
The vulnerability is being exploited in the wild
Vendor: BUFFALO INC.
Affected software:
WSR-2533DHPL2
WSR-2533DHP3
WSR-2533DHPL2
WSR-2533DHP3
Detailed vulnerability description
The vulnerability allows a remote attacker to perform directory traversal attacks.
The vulnerability exists due to input validation error when processing directory traversal sequences in the web interfaces. A remote attacker can send a specially crafted HTTP request and bypass authentication.
Note, the vulnerability is being exploited in-the-wild by the Mirai botnet in August 2021.
How to mitigate CVE-2021-20090
Cybersecurity Help is currently unaware of any official solution to address this vulnerability.