CVE-2026-31847
HighCVSS 8.8Exploitation Probability (EPSS)
Low risk35th percentile - higher than 35% of all known CVEs
Summary
Hidden functionality in the /goform/setSysTools endpoint in Nexxt Solutions Nebula 300+ firmware up to version 12.01.01.37 allows remote enablement of a Telnet service. An authenticated attacker can send a crafted POST request with parameters such as telnetManageEn=true and telnetPwd to activate Telnet on port 23.
Risk Assessment
An authenticated attacker can gain remote access to the device via Telnet, potentially leading to unauthorized control and network compromise.
Recommendation
Update the firmware to a version that removes the hidden functionality, or restrict access to the admin panel from untrusted networks.
Other vulnerabilities in Nexxt Solutions Nebula 300+
See all- CVE-2026-31848Critical
Nexxt Solutions Nebula 300+ firmware through version 12.01.01.37 uses the ecos_pw cookie for authentication, which contains Base64-encoded credential data combined with a static suffix. Because the encoding is reversible and lacks integrity protection, an attacker can reconstruct or forge a valid cookie value without proper authentication.
- CVE-2026-31846Medium
Missing authentication in the /goform/ate endpoint in Nexxt Solutions Nebula 300+ firmware through version 12.01.01.37 allows an adjacent unauthenticated attacker to retrieve sensitive device information, including the administrator password. An attacker can decode this value to obtain valid administrative credentials and authenticate to the device.
Original NVD description (English source)
Hidden functionality in the /goform/setSysTools endpoint in Nexxt Solutions Nebula 300+ firmware through version 12.01.01.37 allows remote enablement of a Telnet service. By sending a crafted POST request with parameters such as telnetManageEn=true and telnetPwd, an authenticated attacker can activate a Telnet service on port 23.