← Vulnerability feed

Vulnerability record · CVE-2026-36959 · published 30 April 2026

CVE-2026-36959: U-speed n300 firmware improper restriction of authentication attempts vulnerability

UU Speed · N300 Firmware

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.

7.5 CVSS 3.1 High EPSS 0.51% · top 59.2% CWE-307 · Improper restriction of authentication attempts
7.5CVSS 3.1 base score
0.51%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
2References, 2 tagged exploit
5 Jul 2026Last modified by NVD

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.

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

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/kirubel-cve/CVE-2026-36959 ExploitThird Party Advisory
https://github.com/kirubel-cve/CVE-2026-36959 ExploitThird Party Advisory

Track CVE-2026-36959 inside VULONE

Watch it alongside the ransomware crews, C2 infrastructure and forum chatter that reference it, query it through the API and pull it into your SIEM over TAXII.

Start free Open in platform

Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

7.5CVE-2026-36958U-speed n300 firmware uncontrolled resource consumption vulnerabilityA denial-of-service vulnerability exists in the U-SPEED N300 V1.0.0 wireless router. By sending a large number of concurrent HTTP requests to random …EPSS 0.49%

Source: NIST National Vulnerability Database (record CVE-2026-36959), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.