How severe is CVE-2026-31847?

CVE-2026-31847 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2026-31847 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (34th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-31847?

CVE-2026-31847 affects Nexxtsolutions Nebula300plus Firmware. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-31847?

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-2026-31847 have an EU (EUVD) identifier?

Yes. CVE-2026-31847 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-14413.

When was CVE-2026-31847 published?

CVE-2026-31847 was published on 2026-03-23 and last updated on 2026-06-17.

CVE-2026-31847

CVE-2026-31847 is a high-severity vulnerability in Nexxtsolutions Nebula300plus Firmware with a CVSS 3.x base score of 8.8. 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-912.

Key facts

Severity: High (CVSS 3.x base score 8.8)
CVSS v4: 8.5
EPSS exploit prediction: 0% (34th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-14413
Weakness: CWE-912
Affected product: Nexxtsolutions Nebula300plus Firmware
Published: 2026-03-23
Last modified: 2026-06-17

Description

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. This exposes a privileged diagnostic interface that is not intended for external access and can be used to interact with the underlying system.

Frequently asked questions

What is CVE-2026-31847?: 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. This exposes a privileged diagnostic interface that is not intended for external access and can be used to interact with the underlying system.
How severe is CVE-2026-31847?: CVE-2026-31847 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2026-31847 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (34th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-31847?: CVE-2026-31847 affects Nexxtsolutions Nebula300plus Firmware. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-31847?: 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-2026-31847 have an EU (EUVD) identifier?: Yes. CVE-2026-31847 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-14413.
When was CVE-2026-31847 published?: CVE-2026-31847 was published on 2026-03-23 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:o:nexxtsolutions:nebula300plus_firmware:*:*:*:*:*:*:*:*

More vulnerabilities in Nexxtsolutions Nebula300plus Firmware

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…
CVE-2026-31848 — Critical (CVSS 9.8): Nexxt Solutions Nebula 300+ firmware through version 12.01.01.37 uses the ecos_pw cookie for authentication, which…
CVE-2026-31849 — Medium (CVSS 6.5): Nexxt Solutions Nebula 300+ firmware through version 12.01.01.37 does not implement CSRF protections on state-changing…
CVE-2026-31850 — Medium (CVSS 4.9): Nexxt Solutions Nebula 300+ firmware through version 12.01.01.37 stores sensitive information, including administrative…

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