Path Traversal in Buffalo Wsr-2533dhp3-bk
CVE-2021-20090
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.
Vulnerability class: Path Traversal (Directory Traversal)
EPSS: 1.000 (100.0th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
Affected products
- Buffalo Wsr-2533dhp3-bk
- Buffalo Wsr-2533dhp3-bk_firmware
- Buffalo Wsr-2533dhpl2-bk
- Buffalo Wsr-2533dhpl2-bk_firmware
- N/a Buffalo Wsr-2533dhpl2, Wsr-2533dhp3 — versions WSR-2533DHPL2 <=1.02, WSR-2533DHP3 <= 1.24
Weakness classification (CWE)
CISA KEV (Known Exploited Vulnerabilities)
This CVE is on the CISA KEV catalog, added on . CISA KEV inclusion means CISA has confirmed in-the-wild exploitation; US federal agencies are required to remediate within a published due date.
BOD 22-01 due date: .
Required action: Apply updates per vendor instructions.
Public proof-of-concept exploits
References
- vulnreport@tenable.com (Exploit, Third Party Advisory)
- vulnreport@tenable.com (US Government Resource, Third Party Advisory, third-party-advisory)
- vulnreport@tenable.com (Exploit, Third Party Advisory)
- 134c704f-9b21-4f2e-91b3-4a467353bcc0 (US Government Resource)
Frequently asked questions
- What is CVE-2021-20090?
- CVE-2021-20090 is a critical-severity vulnerability in Buffalo Wsr-2533dhp3-bk, classified under Path Traversal. CVSS score: 9.8/10. Published 2021-04-29.
- How severe is CVE-2021-20090?
- Critical severity. CVSS v3 base score is 9.8 out of 10.
- Is CVE-2021-20090 known to be exploited?
- Yes. CVE-2021-20090 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2021-11-03), indicating it is being actively exploited. 17 public proof-of-concept repositories are indexed.