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

Vulnerability from cvelistv5 – Published: 2021-04-29 14:29 – Updated: 2024-08-03 17:30
VLAI Shadowserver Previdian
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 CPE status
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: 2026-09-02 00:00 UTC

Exploited: Yes

Characteristics
Severity: 75.0
Timestamps
First Seen: 2025-02-25
Asserted: 2025-02-25
Last Seen: 2026-09-02
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 2026-09-02: 2
Evidence

Type: Honeypot

Signal: In The Wild Attempts

Confidence: 70%

Source: shadowserver

Details
1D 2
Iot yes
Feed Shadowserver Foundation honeypot/exploited-vulnerabilities
Type http-scan
Class router
7D Avg 1
Vendor Buffalo
30D Avg 0
90D Avg 0
Product Buffalo SR-2533DHPL2 and WSR-2533DHP3
Cisa Kev no
Connections 2
Observation Date 2026-09-02
Vulnerability Class CVSS
Vulnerability Score 7.5
Vulnerability Severity High
References
Created: 2026-07-01 07:17 UTC | Updated: 2026-09-04 01:01 UTC
Previdian
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.


Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.