CVE-2017-12763

HIGH

NoMachine < 5.3.9 - Authenticated Privilege Escalation via Local File Access

Title source: llm
STIX 2.1

Exploitation Summary

EIP tracks 1 public exploit for CVE-2017-12763. PoCs published by Daniele Linguaglossa.

AI-analyzed exploit summary This exploit leverages the NX_SYSTEM environment variable in NoMachine's nxnode.bin to execute a custom Perl script that calls nxexec with elevated privileges, allowing arbitrary file reads. The PoC crafts a temporary directory and Perl script to bypass sandbox restrictions and execute nxcat.sh.

Description

An unspecified server utility in NoMachine before 5.3.10 on Mac OS X and Linux allows authenticated users to gain privileges by gaining access to local files.

Exploits (1)

exploitdb WORKING POC
by Daniele Linguaglossa · pythonlocalosx
https://www.exploit-db.com/exploits/42460

This exploit leverages the NX_SYSTEM environment variable in NoMachine's nxnode.bin to execute a custom Perl script that calls nxexec with elevated privileges, allowing arbitrary file reads. The PoC crafts a temporary directory and Perl script to bypass sandbox restrictions and execute nxcat.sh.

Classification
Working Poc 95%
Attack Type
Lpe
Complexity
Moderate
Reliability
Reliable
Target: NoMachine 5.3.9
No auth needed
Prerequisites: Local access to the target system · Presence of NoMachine 5.3.9 installation · Paths to nxnode.bin and nxexec binaries
devstral-2 · analyzed Feb 16, 2026 Full analysis →

References (2)

Core 2
Core References
Patch, Vendor Advisory x_refsource_confirm
https://www.nomachine.com/SU08O00185

Scores

CVSS v3 8.8
EPSS 0.0386
EPSS Percentile 88.8%
Attack Vector NETWORK
CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Details

CWE
CWE-276
Status published
Products (1)
nomachine/nomachine < 5.3.9
Published Aug 29, 2017
Tracked Since Feb 18, 2026