CVE-2025-34181
CVE-2025-34181 is a high-severity vulnerability with a CVSS 4.0 base score of 8.7. 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-22.
Key facts
- Severity: High (CVSS 4.0 base score 8.7)
- EPSS exploit prediction: 1% (55th percentile)
- Actively exploited: Not listed in CISA KEV
- EU (EUVD) id: EUVD-2025-203378
- Weakness: CWE-22
- Published:
- Last modified:
Description
NetSupport Manager < 14.12.0001 contains an arbitrary file write vulnerability in its Connectivity Server/Gateway PUTFILE request handler. An attacker with a valid Gateway Key can supply a crafted filename containing directory traversal sequences to write files to arbitrary locations on the server. This can be leveraged to place attacker-controlled DLLs or executables in privileged paths and achieve remote code execution in the context of the NetSupport Manager connectivity service.
Frequently asked questions
- What is CVE-2025-34181?
- NetSupport Manager < 14.12.0001 contains an arbitrary file write vulnerability in its Connectivity Server/Gateway PUTFILE request handler. An attacker with a valid Gateway Key can supply a crafted filename containing directory traversal sequences to write files to arbitrary locations on the server. This can be leveraged to place attacker-controlled DLLs or executables in privileged paths and achieve remote code execution in the context of the NetSupport Manager connectivity service.
- How severe is CVE-2025-34181?
- CVE-2025-34181 has a CVSS 4.0 base score of 8.7, rated high severity.
- Is CVE-2025-34181 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (55th percentile), an estimate of the probability of exploitation in the next 30 days.
- How do I fix CVE-2025-34181?
- 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-2025-34181 have an EU (EUVD) identifier?
- Yes. CVE-2025-34181 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-203378.
- When was CVE-2025-34181 published?
- CVE-2025-34181 was published on 2025-12-15 and last updated on 2026-06-17.
References
- https://kb.netsupportsoftware.com/knowledge-base/updating-and-securing-netsupport-manager/
- https://ret2.me/post/2025-12-04-exploiting-netsupport-gateway/
- https://www.vulncheck.com/advisories/netsupport-manager-authenticated-path-traversal-arbitrary-write-rce
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