CVE-2021-20091

HIGH EXPLOITED IN THE WILD NUCLEI

Buffalo WSR-2533DHPL2 and WSR-2533DHP3 Firmware - Authenticated Remote Code Execution via Web Interface Input

Title source: llm

Exploitation Summary

CVE-2021-20091 has been observed exploited in the wild (reported by VulnCheck KEV, InTheWild.io). A Nuclei detection template is also available.

Description

The web interfaces of Buffalo WSR-2533DHPL2 firmware version <= 1.02 and WSR-2533DHP3 firmware version <= 1.24 do not properly sanitize user input. An authenticated remote attacker could leverage this vulnerability to alter device configuration, potentially gaining remote code execution.

Nuclei Templates (1)

Buffalo WSR-2533DHPL2 - Configuration File Injection

HIGHby gy741,pdteam,parth

References (1)

Core 1

Core References

Third Party Advisory x_refsource_misc

https://www.tenable.com/security/research/tra-2021-13

Scores

CVSS v3 8.8

EPSS 0.0869

EPSS Percentile 94.4%

Attack Vector NETWORK

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Details

VulnCheck KEV 2021-09-20

InTheWild.io 2021-12-17

Status published

Products (2)

buffalo/wsr-2533dhp3-bk_firmware < 1.24

buffalo/wsr-2533dhpl2-bk_firmware < 1.02

Published Apr 29, 2021

Tracked Since Feb 18, 2026