CVE-2026-36959

HIGH

U-SPEED N300 Firmware V1.0.0 - Unauthenticated Brute-Force Attack via Login Endpoint

Title source: llm
STIX 2.1

Exploitation Summary

EIP tracks 1 public exploit for CVE-2026-36959. PoCs published by kirubel-cve.

AI-analyzed exploit summary The repository provides a detailed technical analysis of CVE-2026-36959, a missing rate limiting vulnerability in U-SPEED Router firmware V1.0.0. It includes a proof-of-concept HTTP request demonstrating the lack of throttling on the login endpoint, along with CVSS scoring, impact analysis, and remediation recommendations.

Description

U-SPEED N300 router V1.0.0 does not implement rate limiting or account lockout protections on the /api/login endpoint. This allows an attacker on the local network to perform unlimited authentication attempts, enabling brute-force attacks against the administrator account and potential unauthorized access to the router management interface.

Exploits (1)

github WRITEUP
by kirubel-cve · poc
https://github.com/kirubel-cve/CVE-2026-36959

The repository provides a detailed technical analysis of CVE-2026-36959, a missing rate limiting vulnerability in U-SPEED Router firmware V1.0.0. It includes a proof-of-concept HTTP request demonstrating the lack of throttling on the login endpoint, along with CVSS scoring, impact analysis, and remediation recommendations.

Classification
Writeup 100%
Attack Type
Auth Bypass
Complexity
Trivial
Reliability
Reliable
Target: U-SPEED Router V1.0.0
No auth needed
Prerequisites: network access to the router
devstral-2 · analyzed Apr 30, 2026 Full analysis →

References (2)

Core 2

Scores

CVSS v3 7.5
EPSS 0.0037
EPSS Percentile 28.5%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

CISA SSVC

Vulnrichment
Exploitation poc
Automatable yes
Technical Impact partial

Details

CWE
CWE-307
Status published
Products (1)
u-speed/n300_firmware 1.0.0
Published Apr 30, 2026
Tracked Since Apr 30, 2026