CVE-2021-20092
HighExploitedThe web interfaces of Buffalo WSR-2533DHPL2 firmware version <= 1.02 and WSR-2533DHP3 firmware version <= 1.24 do not properly restrict access to sensitive information from an unauthorized actor.
Published Apr 29, 2021 · Updated Nov 21, 2024
Key Facts
Patch immediately- CVE-2021-20092 is a high-severity vulnerability (CVSS 7.5 v3.1) affecting Wsr-2533dhp3-Bk Firmware (Buffalo), Wsr-2533dhpl2-Bk Firmware (Buffalo), Buffalo WSR-2533DHPL2, Buffalo WSR-2533DHP3.
- It is exploited in the wild, listed in Industry KEV feed, CIRCL KEV since Feb 25, 2025. No public exploit code is known.
- EPSS estimates a 8.2% probability of exploitation in the next 30 days.
- Fixed versions are available, including Wsr-2533dhp3-Bk Firmware <=1.24, Wsr-2533dhpl2-Bk Firmware <=1.02, Wsr-2533dhp3-Bk Firmware 1.24.
- Brandefense priority: patch immediately, because it is listed as exploited in the wild.
CVSS v3.1
7.5
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
EPSS (30-day exploit likelihood)
8.2%
Higher than 94.8% of all scored CVEs
Exploited in the wild
Yes
2 catalog listings
Public exploit code
None known
Get the full CVE-2021-20092 brief as a PDF
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Description
The web interfaces of Buffalo WSR-2533DHPL2 firmware version <= 1.02 and WSR-2533DHP3 firmware version <= 1.24 do not properly restrict access to sensitive information from an unauthorized actor.
Known-Exploited Catalog Listings
| Catalog | Added | Remediation due | Ransomware use |
|---|---|---|---|
| Industry KEV feed | Feb 25, 2025 | n/a | Not reported |
| CIRCL KEV | Feb 25, 2025 | n/a | Not reported |
Required action: Apply remediations or mitigations per vendor instructions or discontinue use of the product if remediation or mitigations are unavailable.
Affected Products
3 affected entries in total| Product | Affected versions | Fixed in |
|---|---|---|
| Wsr-2533dhp3-Bk FirmwareBuffalo | See advisory | 1.24 |
| Wsr-2533dhpl2-Bk FirmwareBuffalo | See advisory | 1.02 |
| Buffalo WSR-2533DHPL2, Buffalo WSR-2533DHP3 | >= WSR-2533DHPL2 <=1.02, WSR-2533DHP3 <= 1.24 | n/a |
Patched Releases
Wsr-2533dhp3-Bk Firmware
<=1.24
Wsr-2533dhpl2-Bk Firmware
<=1.02
Timeline
Publicly disclosed
Apr 29, 2021
Last updated
Nov 21, 2024
Added to Industry KEV feed
Feb 25, 2025
Added to CIRCL KEV
Feb 25, 2025
Weakness Type
- CWE-287 Improper Authentication
References
- advisoryhttps://www.tenable.com/security/research/tra-2021-13
- exploitVulnCheck exploitation report
- exploitVulnCheck exploitation report
- exploitVulnCheck exploitation report
- exploitVulnCheck exploitation report
FAQ
Common Questions.
The web interfaces of Buffalo WSR-2533DHPL2 firmware version <= 1.02 and WSR-2533DHP3 firmware version <= 1.24 do not properly restrict access to sensitive information from an unauthorized actor.
Affected: Wsr-2533dhp3-Bk Firmware (Buffalo); Wsr-2533dhpl2-Bk Firmware (Buffalo); Buffalo WSR-2533DHPL2, Buffalo WSR-2533DHP3 versions >= WSR-2533DHPL2 <=1.02, WSR-2533DHP3 <= 1.24. The full list is in the CVE brief.
It is exploited in the wild, listed in Industry KEV feed, CIRCL KEV since Feb 25, 2025.
No, it is not currently listed in the CISA Known Exploited Vulnerabilities catalog.
No public exploit code is known.
Fixed versions are available, including Wsr-2533dhp3-Bk Firmware <=1.24, Wsr-2533dhpl2-Bk Firmware <=1.02, Wsr-2533dhp3-Bk Firmware 1.24.
Brandefense priority: patch immediately, because it is listed as exploited in the wild.
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