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Vulnerabilities

Vulnerability · CVE-2026-36959

U-SPEED N300 router V1.0.0 does not implement rate limiting or account lockout protections on the /api/login endpoint.

Published Apr 30, 2026 · catalog updated Jul 5, 2026 · n300 firmware

Check if you run it

No confirmed exploitation is on record for CVE-2026-36959. EPSS is 0.51%. Act only if a listed version of n300 firmware is installed.

Gaps on this record

  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
High7.5
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.51%
Remediation
Not established
Affected products
cpe u-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.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • cpe u-speed/n300 firmware1.0.0

How to fix CVE-2026-36959

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2026-36959. EPSS is 0.51%. Act only if a listed version of n300 firmware is installed.

Which versions are affected?

Compare what you have installed with u-speed/n300 firmware 1.0.0. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-307: Improper Restriction of Excessive Authentication Attempts. EPSS 0.51%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Apr 30, 2026 · NIST NVD

    Detected

    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.

  2. Jul 5, 2026 · NIST NVD

    Updated

    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.

Sources

  • CVE.orgVulnerability recordCVE-2026-36959

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2026-36959

    30-day exploitation probability 0.5%

    first.org
  • NIST NVDVulnerability recordCVE-2026-36959

    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 pot

    nvd.nist.gov

References

Freshness

Last verified in this catalog Oct 18, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.