CVE-2026-36959Public exploitNetwork attack vector

Administrator compromise via unlimited login attempts

Published Apr 30, 2026 · Updated Apr 30, 2026

Missing brute-force protection in U-SPEED N300 router 1.0.0 allows remote attackers to compromise the administrator account. The /api/login handler accepts repeated password guesses without rate limiting or account lockout after failures. The endpoint requires no credentials but is exposed on the local network; a correct guess grants access to the router management interface.

CVSS severity7.5
High
EPSS probability0.35%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Missing brute-force protection in U-SPEED N300 router 1.0.0 allows remote attackers to compromise the administrator account. The /api/login handler accepts repeated password guesses without rate limiting or account lockout after failures. The endpoint requires no credentials but is exposed on the local network; a correct guess grants access to the router management interface.

The record

CVE
CVE-2026-36959
Published
Apr 30, 2026
Updated
Apr 30, 2026
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-307, CAPEC-49, T1110
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 30, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 30, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

7.5CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-307Improper Restriction of Excessive Authentication Attempts
CAPEC-49Password Brute Forcing
T1110Brute Force

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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