How severe is CVE-2025-0309?

CVE-2025-0309 has a CVSS 4.0 base score of 6.0, rated medium severity.

Is CVE-2025-0309 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (7th percentile), an estimate of the probability of exploitation in the next 30 days.

How do I fix CVE-2025-0309?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2025-0309 have an EU (EUVD) identifier?

Yes. CVE-2025-0309 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-24661.

When was CVE-2025-0309 published?

CVE-2025-0309 was published on 2025-08-14 and last updated on 2026-06-17.

CVE-2025-0309

CVE-2025-0309 is a medium-severity vulnerability with a CVSS 4.0 base score of 6.0. 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-295.

Key facts

Severity: Medium (CVSS 4.0 base score 6.0)
EPSS exploit prediction: 0% (7th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-24661
Weakness: CWE-295
Published: 2025-08-14
Last modified: 2026-06-17

Description

An insufficient validation on the server connection endpoint in Netskope Client allows local users to elevate privileges on the system. The insufficient validation allows Netskope Client to connect to any other server with Public Signed CA TLS certificates and send specially crafted responses to elevate privileges.

Frequently asked questions

What is CVE-2025-0309?: An insufficient validation on the server connection endpoint in Netskope Client allows local users to elevate privileges on the system. The insufficient validation allows Netskope Client to connect to any other server with Public Signed CA TLS certificates and send specially crafted responses to elevate privileges.
How severe is CVE-2025-0309?: CVE-2025-0309 has a CVSS 4.0 base score of 6.0, rated medium severity.
Is CVE-2025-0309 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (7th percentile), an estimate of the probability of exploitation in the next 30 days.
How do I fix CVE-2025-0309?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2025-0309 have an EU (EUVD) identifier?: Yes. CVE-2025-0309 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-24661.
When was CVE-2025-0309 published?: CVE-2025-0309 was published on 2025-08-14 and last updated on 2026-06-17.

References

Other CWE-295 (Improper Certificate Validation) vulnerabilities

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