CVE-2021-20092 (GCVE-0-2021-20092)

Vulnerability from cvelistv5 – Published: 2021-04-29 14:29 – Updated: 2024-08-03 17:30
VLAI Shadowserver KEVIntel
Summary
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.
Severity
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
CWE
  • Improper Access Control
Assigner
References
Impacted products
Vendor Product Version
n/a Buffalo WSR-2533DHPL2, Buffalo WSR-2533DHP3 Affected: WSR-2533DHPL2 <=1.02, WSR-2533DHP3 <= 1.24
Shadowserver
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: e17a90f6-e845-458e-833c-49f0f91df08a

Vulnerability ID: CVE-2021-20092

Status: Confirmed

Status Updated: 2026-07-15 00:00 UTC

Exploited: Yes

Characteristics
Severity: 75.0
Timestamps
First Seen: 2025-02-25
Asserted: 2025-02-25
Last Seen: 2026-07-15
Scope
Asset Exposure: ['internet-facing']
Notes: Affected: Buffalo / Buffalo SR-2533DHPL2 and WSR-2533DHP3 | Class: router | Severity: High (CVSS 7.5) | IoT: yes | In CISA KEV: no | Honeypot connections on 2026-07-15: 2
Evidence

Type: Honeypot

Signal: In The Wild Attempts

Confidence: 70%

Source: shadowserver

Details
1D 1
Iot yes
Feed Shadowserver Foundation honeypot/exploited-vulnerabilities
Type http-scan
Class router
7D Avg 0
Vendor Buffalo
30D Avg 0
90D Avg 0
Product Buffalo SR-2533DHPL2 and WSR-2533DHP3
Cisa Kev no
Connections 2
Observation Date 2026-07-15
Vulnerability Class CVSS
Vulnerability Score 7.5
Vulnerability Severity High
References
Created: 2026-07-01 07:17 UTC | Updated: 2026-07-17 01:01 UTC
KEVIntel
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: 98b348b2-af92-4db7-a559-72cc0e9e3885

Vulnerability ID: CVE-2021-20092

Status: Confirmed

Status Updated: 2025-10-03 00:00 UTC

Exploited: Yes

Timestamps
First Seen: 2025-10-03
Asserted: 2025-10-03
Scope
Notes: KEVIntel entry: The web interfaces of Buffalo WSR-2533DHPL2 firmware version <= 1.02 and WSR-2533DHP3 firmware version <= 1.24 do not properly restrict... | Affected: Buffalo / WSR-2533DHPL2, WSR-2533DHP3 | CVSS: 7.5 (HIGH) | Used in malware: unknown | Not yet in CISA KEV: True
Evidence

Type: Public Report

Signal: Successful Exploitation

Confidence: 70%

Source: kevintel

Details
Feed KEVIntel (kevintel.com)
Title The web interfaces of Buffalo WSR-2533DHPL2 firmware version <= 1.02 and WSR-2533DHP3 firmware version <= 1.24 do not properly restrict...
Vendor Buffalo
Product WSR-2533DHPL2, WSR-2533DHP3
Added Date 2025-10-03T00:00:00.000Z
Cvss Score 7.5
Epss Score None
Cvss Severity HIGH
Epss Percentile None
Used In Malware unknown
Ahead Of Cisa Kev None
Not Yet In Cisa Kev True
References
Created: 2026-06-19 12:42 UTC | Updated: 2026-06-19 12:42 UTC
Show details on NVD website
To clipboard 

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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.