Nexxt Nebula 300+ - Lack of Rate Limiting Enables Brute-Force Attacks
Priority LOW 36CWE-307Published · Updated
Key facts
- Attack vector
- Adjacent network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- High
- Attack requirements
- None
- Impact type
- Security bypass
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- No fix listed
Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-307.
Summary
Nexxt Solutions Nebula 300+ firmware through version 12.01.01.37 does not implement rate limiting or account lockout mechanisms on authentication interfaces. An attacker can perform unlimited authentication attempts against endpoints that rely on credential validation, enabling brute-force attacks to guess administrative credentials without restriction.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00349 28th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Total
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| Nexxt Solutions | Nebula 300+ | up to 12.01.01.37 | — | No fix listed | CNA |
- Nebula 300+ VendorNexxt Solutions Affected up to 12.01.01.37 Fixed in — No fix listed CNA
CPE configurations NVD · 2
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:o:nexxtsolutions:nebula300plus_firmware:*:*:*:*:*:*:*:* | up to 12.01.01.37 | Vulnerable | Nexxt Solutions |
| cpe:2.3:h:nexxtsolutions:nebula300plus:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Nexxt Solutions |
- cpe:2.3:o:nexxtsolutions:nebula300plus_firmware:*:*:*:*:*:*:*:* Versions up to 12.01.01.37 Vulnerable ·Nexxt Solutions
- cpe:2.3:h:nexxtsolutions:nebula300plus:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Nexxt Solutions
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2026-31851
- 2026-10-03 Alias added: GHSA-v8rr-whp7-p37j
- 2026-10-25 EPSS moved to the below the 50th percentile
References
More Nexxt Solutions Nebula300plus Firmware vulnerabilities
- TI-2026-24401 Reversible ecos_pw Cookie Allows Authentication Bypass in Nexxt Nebula 300+ CVSS 4.0HIGH 8.7
- TI-2026-24400 Hidden Functionality Enables Remote Telnet Activation via /goform/setSysTools in Nexxt Nebula 300+ CVSS 4.0HIGH 8.5
- TI-2026-24402 Missing CSRF Protection on Administrative Endpoints in Nexxt Nebula 300+ CVSS 4.0HIGH 7.2
- TI-2026-24403 Plaintext Storage of Credentials in Configuration Backup in Nexxt Nebula 300+ CVSS 4.0MEDIUM 6.8
Sources
- CVE-2026-31851 · CVE Program
- CVE-2026-31851 · NVD
- FIRST EPSS
- GHSA-v8rr-whp7-p37j · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences