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CVE-2025-0309VulnerabilityPublished Updated

CVE-2025-0309: Netskope Client · Vulnerability

Affects Netskope ClientSource CVE Database V5

0

Not known to be exploited · CVSS 6.0 Medium.

Data as of 26 Oct 2026, 06:26 UTC

CVSS 4.0 base score
6.0Medium
How severe the flaw is on the 0–10 CVSS scale.
EPSS
0.1% chance of exploitation in 30 days – higher than 8% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
CVSS:4.0/AV:P/AC:L/AT:P/PR:L/UI:N/VC:N/VI:L/VA:H/SC:H/SI:H/SA:H

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 14 Aug 2025

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponised: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 2026-10-26.

What to do

Affected software

ProductAffectedFixed in
Netskope Netskope ClientAffected
  • =0
Fixed in–

AI-suggested

To mitigate CVE-2025-0309 effectively, European organizations should: 1) Immediately audit and inventory all systems running the Netskope Client to identify affected versions. 2) Monitor vendor communications closely for official patches or updates addressing this vulnerability and prioritize their deployment once available. 3) Implement strict local user access controls and minimize the number of users with local privileges on endpoints running the Netskope Client to reduce the risk of exploitation. 4) Employ endpoint detection and response (EDR) solutions to detect anomalous behaviors indicative of privilege escalation attempts. 5) Enforce network segmentation and application whitelisting to limit the ability of malicious servers or processes to interact with the Netskope Client. 6) Conduct regular security awareness training to reduce insider threat risks and ensure users understand the importance of reporting suspicious activities. 7) Review and harden TLS validation policies where possible, potentially configuring the Netskope Client or network environment to restrict accepted server certificates to known, trusted endpoints. 8) Utilize host-based intrusion prevention systems (HIPS) to block unauthorized attempts to exploit local vulnerabilities. These measures, combined with timely patching, will reduce the attack surface and limit the potential for privilege escalation via this vulnerability.

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.

References

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