CVE-2026-36959
CVE-2026-36959 is a high-severity vulnerability in U-speed N300 Firmware with a CVSS 3.x base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-307.
Key facts
- Severity: High (CVSS 3.x base score 7.5)
- EPSS exploit prediction: 0% (27th percentile)
- Actively exploited: Not listed in CISA KEV
- EU (EUVD) id: EUVD-2026-26380
- Weakness: CWE-307
- Affected product: U-speed N300 Firmware
- Published:
- Last modified:
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.
Frequently asked questions
- What is CVE-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 potential unauthorized access to the router management interface.
- How severe is CVE-2026-36959?
- CVE-2026-36959 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.
- Is CVE-2026-36959 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (27th percentile), an estimate of the probability of exploitation in the next 30 days.
- What products are affected by CVE-2026-36959?
- CVE-2026-36959 affects U-speed N300 Firmware. See the affected-products list for the exact vulnerable versions.
- How do I fix CVE-2026-36959?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
- Does CVE-2026-36959 have an EU (EUVD) identifier?
- Yes. CVE-2026-36959 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-26380.
- When was CVE-2026-36959 published?
- CVE-2026-36959 was published on 2026-04-30 and last updated on 2026-07-05.
References
EU advisories (EUVD)
Affected products (1)
- cpe:2.3:o:u-speed:n300_firmware:1.0.0:*:*:*:*:*:*:*
More vulnerabilities in U-speed N300 Firmware
- CVE-2026-36958 — High (CVSS 7.5): A denial-of-service vulnerability exists in the U-SPEED N300 V1.0.0 wireless router. By sending a large number of…
All CVEs affecting U-speed N300 Firmware →
Other CWE-307 (Improper Restriction of Excessive Authentication Attempts) vulnerabilities
- CVE-2026-6853 — Critical (CVSS 9.8): Improper restriction of excessive authentication attempts vulnerability in Başbelen Group Food Cafe Businesses…
- CVE-2026-8760 — Critical (CVSS 9.8): The Login with OTP plugin for WordPress is vulnerable to authentication bypass in all versions up to, and including,…
- CVE-2020-37228 — Critical (CVSS 9.8): iDS6 DSSPro Digital Signage System 6.2 contains a CAPTCHA security bypass vulnerability that allows attackers to bypass…
- CVE-2026-33879 — Critical (CVSS 9.8): Federated Learning and Interoperability Platform (FLIP) is an open-source platform for federated training and…
- CVE-2026-33640 — Critical (CVSS 9.8): Outline is a service that allows for collaborative documentation. Outline implements an Email OTP login flow for users…
- CVE-2026-31851 — Critical (CVSS 9.8): Nexxt Solutions Nebula 300+ firmware through version 12.01.01.37 does not implement rate limiting or account lockout…
Browse all CWE-307 (Improper Restriction of Excessive Authentication Attempts) vulnerabilities →