What is CVE-2023-39107?

CVE-2023-39107 is a critical-severity vulnerability in Apple macOS, classified under Improper Link Resolution Before File Access. CVSS score: 9.1/10. Published 2023-08-04.

How severe is CVE-2023-39107?

Critical severity. CVSS v3 base score is 9.1 out of 10.

Is CVE-2023-39107 known to be exploited?

1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Vulnerability in Apple macOS

CVE-2023-39107

An arbitrary file overwrite vulnerability in NoMachine Free Edition and Enterprise Client for macOS before v8.8.1 allows attackers to overwrite root-owned files by using hardlinks.

Published 2023-08-04 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 9.1 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H.

EPSS exploit prediction

EPSS: 0.012 (67.4th percentile), scored 2026-09-29.

Low probability of exploitation in the next 30 days, but still tracked. 67th percentile — 67.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.012 · newest: 0.012 · change: 0.000

Affected products

Weakness classification (CWE)

CWE-59 — Improper Link Resolution Before File Access

Public proof-of-concept exploits

NSEcho/vos

References

kb.nomachine.com/TR07U10948 (Vendor Advisory)
kb.nomachine.com/SU07U00247 (Release Notes)
www.ns-echo.com/posts/nomachine_afo.html (Exploit)

Frequently asked questions

What is CVE-2023-39107?: CVE-2023-39107 is a critical-severity vulnerability in Apple macOS, classified under Improper Link Resolution Before File Access. CVSS score: 9.1/10. Published 2023-08-04.
How severe is CVE-2023-39107?: Critical severity. CVSS v3 base score is 9.1 out of 10.
Is CVE-2023-39107 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.