FKIE_CVE-2021-20716
Vulnerability from fkie_nvd - Published: 2021-04-28 01:15 - Updated: 2026-06-17 03:34
Severity
Summary
Hidden functionality in multiple Buffalo network devices (BHR-4RV firmware Ver.2.55 and prior, FS-G54 firmware Ver.2.04 and prior, WBR2-B11 firmware Ver.2.32 and prior, WBR2-G54 firmware Ver.2.32 and prior, WBR2-G54-KD firmware Ver.2.32 and prior, WBR-B11 firmware Ver.2.23 and prior, WBR-G54 firmware Ver.2.23 and prior, WBR-G54L firmware Ver.2.20 and prior, WHR2-A54G54 firmware Ver.2.25 and prior, WHR2-G54 firmware Ver.2.23 and prior, WHR2-G54V firmware Ver.2.55 and prior, WHR3-AG54 firmware Ver.2.23 and prior, WHR-G54 firmware Ver.2.16 and prior, WHR-G54-NF firmware Ver.2.10 and prior, WLA2-G54 firmware Ver.2.24 and prior, WLA2-G54C firmware Ver.2.24 and prior, WLA-B11 firmware Ver.2.20 and prior, WLA-G54 firmware Ver.2.20 and prior, WLA-G54C firmware Ver.2.20 and prior, WLAH-A54G54 firmware Ver.2.54 and prior, WLAH-AM54G54 firmware Ver.2.54 and prior, WLAH-G54 firmware Ver.2.54 and prior, WLI2-TX1-AG54 firmware Ver.2.53 and prior, WLI2-TX1-AMG54 firmware Ver.2.53 and prior, WLI2-TX1-G54 firmware Ver.2.20 and prior, WLI3-TX1-AMG54 firmware Ver.2.53 and prior, WLI3-TX1-G54 firmware Ver.2.53 and prior, WLI-T1-B11 firmware Ver.2.20 and prior, WLI-TX1-G54 firmware Ver.2.20 and prior, WVR-G54-NF firmware Ver.2.02 and prior, WZR-G108 firmware Ver.2.41 and prior, WZR-G54 firmware Ver.2.41 and prior, WZR-HP-G54 firmware Ver.2.41 and prior, WZR-RS-G54 firmware Ver.2.55 and prior, and WZR-RS-G54HP firmware Ver.2.55 and prior) allows a remote attacker to enable the debug option and to execute arbitrary code or OS commands, change the configuration, and cause a denial of service (DoS) condition.
References
| URL | Tags | ||
|---|---|---|---|
| vultures@jpcert.or.jp | https://jvn.jp/en/vu/JVNVU90274525/index.html | Third Party Advisory | |
| vultures@jpcert.or.jp | https://www.buffalo.jp/news/detail/20210427-02.html | Vendor Advisory | |
| af854a3a-2127-422b-91ae-364da2661108 | https://jvn.jp/en/vu/JVNVU90274525/index.html | Third Party Advisory | |
| af854a3a-2127-422b-91ae-364da2661108 | https://www.buffalo.jp/news/detail/20210427-02.html | Vendor Advisory |
Impacted products
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"lang": "en",
"value": "Hidden functionality in multiple Buffalo network devices (BHR-4RV firmware Ver.2.55 and prior, FS-G54 firmware Ver.2.04 and prior, WBR2-B11 firmware Ver.2.32 and prior, WBR2-G54 firmware Ver.2.32 and prior, WBR2-G54-KD firmware Ver.2.32 and prior, WBR-B11 firmware Ver.2.23 and prior, WBR-G54 firmware Ver.2.23 and prior, WBR-G54L firmware Ver.2.20 and prior, WHR2-A54G54 firmware Ver.2.25 and prior, WHR2-G54 firmware Ver.2.23 and prior, WHR2-G54V firmware Ver.2.55 and prior, WHR3-AG54 firmware Ver.2.23 and prior, WHR-G54 firmware Ver.2.16 and prior, WHR-G54-NF firmware Ver.2.10 and prior, WLA2-G54 firmware Ver.2.24 and prior, WLA2-G54C firmware Ver.2.24 and prior, WLA-B11 firmware Ver.2.20 and prior, WLA-G54 firmware Ver.2.20 and prior, WLA-G54C firmware Ver.2.20 and prior, WLAH-A54G54 firmware Ver.2.54 and prior, WLAH-AM54G54 firmware Ver.2.54 and prior, WLAH-G54 firmware Ver.2.54 and prior, WLI2-TX1-AG54 firmware Ver.2.53 and prior, WLI2-TX1-AMG54 firmware Ver.2.53 and prior, WLI2-TX1-G54 firmware Ver.2.20 and prior, WLI3-TX1-AMG54 firmware Ver.2.53 and prior, WLI3-TX1-G54 firmware Ver.2.53 and prior, WLI-T1-B11 firmware Ver.2.20 and prior, WLI-TX1-G54 firmware Ver.2.20 and prior, WVR-G54-NF firmware Ver.2.02 and prior, WZR-G108 firmware Ver.2.41 and prior, WZR-G54 firmware Ver.2.41 and prior, WZR-HP-G54 firmware Ver.2.41 and prior, WZR-RS-G54 firmware Ver.2.55 and prior, and WZR-RS-G54HP firmware Ver.2.55 and prior) allows a remote attacker to enable the debug option and to execute arbitrary code or OS commands, change the configuration, and cause a denial of service (DoS) condition."
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"value": "Una funcionalidad Hidden en m\u00faltiples dispositivos de red de Buffalo (firmware de BHR-4RV Ver.2.55 y anteriores, firmware de FS-G54 Ver.2.04 y anteriores, firmware de WBR2-B11 Ver.2.32 y anteriores, firmware de WBR2-G54 Ver.2 .32 y anteriores, firmware de WBR2-G54-KD Ver.2.32 y anteriores, firmware de WBR-B11 Ver.2.23 y anteriores, firmware de WBR-G54 Ver.2.23 y anteriores, firmware de WBR-G54L Ver.2.20 y anteriores, firmware de WHR2-A54G54 Ver.2 .25 y anteriores, firmware de WHR2-G54 Ver.2.23 y anteriores, firmware de WHR2-G54V Ver.2.55 y anteriores, firmware de WHR3-AG54 Ver.2.23 y anteriores, firmware de WHR-G54 Ver.2.16 y anteriores, firmware de WHR-G54-NF Ver.2 .10 y anteriores, firmware de WLA2-G54 Ver.2.24 y anteriores, firmware de WLA2-G54C Ver.2.24 y anteriores, firmware de WLA-B11 Ver.2.20 y anteriores, firmware de WLA-G54 Ver.2.20 y anteriores, firmware de WLA-G54C Ver.2.20 y anteriores, firmware de WLAH-A54G54 Ver.2 .54 y anteriores, firmware de WLAH-AM54G54 Ver.2.54 y anteriores, firmware de WLAH-G54 Ver.2.54 y anteriores, firmware de WLI2-TX1-AG54 Ver.2.53 y anteriores, firmware de WLI2-TX1-AMG54 Ver.2.53 y anteriores, firmware de WLI2-TX1-G54 Ver.2 .20 y anteriores, firmware de WLI3-TX1-AMG54 Ver.2.53 y anteriores, firmware de WLI3-TX1-G54 Ver.2.53 y anteriores, firmware de WLI-T1-B11 Ver.2.20 y anteriores, firmware de WLI-TX1-G54 Ver.2.20 y anteriores, firmware de WVR-G54-NF Ver.2 .02 y anteriores, firmware de WZR-G108 Ver.2.41 y anteriores, firmware de WZR-G54 Ver.2.41 y anteriores, firmware de WZR-HP-G54 Ver.2.41 y anteriores, firmware de WZR-RS-G54 Ver.2.55 y anteriores, y firmware de WZR-RS-G54HP Ver.2.55 y anteriores) permite a un atacante remoto habilitar la opci\u00f3n de depuraci\u00f3n y ejecutar c\u00f3digo arbitrario o comandos del Sistema Operativo, cambiar la configuraci\u00f3n, y causar una condici\u00f3n de denegaci\u00f3n de servicio (DoS)"
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Drag nodes to arrange them. Double-click a related vulnerability to open it, or a source to visit its link. The Physics button on the left tunes the layout and the simulation; the legend at the bottom left hides or shows nodes by kind and by sighting type.
Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
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.
Vulnerability timeline
Sightings and recorded dates, grouped by day · UTC
How durations are calculated
Following the VTEM framework (Black Hat USA 2015), time to patch starts when the vendor or a coordinator was informed, total time to patch at discovery, and disclosure to patch at public disclosure; vendor response time runs from the report to its acknowledgement. Time to exploit and time unpatched start at the earliest discovery or report, falling back to public disclosure. Unpatched time ends at the first recorded patch, or the calculation time when no patch is recorded. Exploitation to patch shows the interval between those two events; a published proof of concept is a public exploit, not exploitation.
Each result shows its source dates. A negative interval means the end event came first; when date-only inputs leave the order open, the result says so. Date-only inputs are approximate. The earliest evidence wins: KEV report dates and sightings are labelled as such. Records describing another vulnerability are listed but never calculated from, and a PoC alone does not establish exploitation. Missing patch evidence does not prove that no patch exists. Filters below change the event list only.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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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.