How severe is CVE-2025-15387?

CVE-2025-15387 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2025-15387 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (23rd percentile), an estimate of the probability of exploitation in the next 30 days.

How do I fix CVE-2025-15387?

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-2025-15387 have an EU (EUVD) identifier?

Yes. CVE-2025-15387 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-205903.

When was CVE-2025-15387 published?

CVE-2025-15387 was published on 2025-12-31 and last updated on 2026-06-17.

CVE-2025-15387

CVE-2025-15387 is a high-severity vulnerability 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-331.

Key facts

Severity: High (CVSS 3.x base score 8.8)
CVSS v4: 8.7
EPSS exploit prediction: 0% (23rd percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-205903
Weakness: CWE-331
Published: 2025-12-31
Last modified: 2026-06-17

Description

VPN Firewall developed by QNO Technology has a Insufficient Entropy vulnerability, allowing unauthenticated remote attackers to obtain any logged-in user session through brute-force attacks and subsequently log into the system.

Frequently asked questions

What is CVE-2025-15387?: VPN Firewall developed by QNO Technology has a Insufficient Entropy vulnerability, allowing unauthenticated remote attackers to obtain any logged-in user session through brute-force attacks and subsequently log into the system.
How severe is CVE-2025-15387?: CVE-2025-15387 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2025-15387 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (23rd percentile), an estimate of the probability of exploitation in the next 30 days.
How do I fix CVE-2025-15387?: 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-2025-15387 have an EU (EUVD) identifier?: Yes. CVE-2025-15387 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-205903.
When was CVE-2025-15387 published?: CVE-2025-15387 was published on 2025-12-31 and last updated on 2026-06-17.

References

Other CWE-331 vulnerabilities

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CVE-2023-49599 — Critical (CVSS 9.8): An insufficient entropy vulnerability exists in the salt generation functionality of WWBN AVideo dev master commit…
CVE-2022-34294 — Critical (CVSS 9.8): totd 1.5.3 uses a fixed UDP source port in upstream queries sent to DNS resolvers. This allows DNS cache poisoning…

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