Nomachine
CVE-2021-42972
HIGH
Vulnerability Assessment
| Weakness |
CWE
ASVS 5.0
V15 - Secure Coding and Architecture Buffer copy size validation
MITRE ATT&CK
1 technique across 1 tactic: Execution The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up. |
| Impact | CVSS score of 8.8 (HIGH). Attack characteristics: local attack vector, low complexity, low privileges required, no user interaction not required. Public proof-of-concept exploit code is available. |
| Exploit ScenarioDerived | A local attacker with access to the system could overflow a buffer to corrupt adjacent memory. |
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Alert meAnalysisAI
NoMachine Server is affected by Buffer Overflow. Rated high severity (CVSS 8.8), this vulnerability is low attack complexity. Public exploit code available and no vendor patch available.
RemediationAI
No vendor patch is available at time of analysis. Monitor vendor advisories for updates. Always validate buffer sizes before copy operations. Use bounded functions (strncpy, snprintf). Enable compiler protections.
Affects your stack
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Checking this CVE against your own stacks and servers is part of the Basic plan and up.
Technical ContextAI · show details
This vulnerability is classified as Buffer Copy without Size Check (CWE-120), which allows attackers to overflow a buffer to corrupt adjacent memory. NoMachine Server is affected by Buffer Overflow. IOCTL Handler 0x22001B in the NoMachine Server above 4.0.346 and below 7.7.4 allow local attackers to execute arbitrary code in kernel mode or cause a denial of service (memory corruption and OS crash) via specially crafted I/O Request Packet. Affected products include: Nomachine Server.
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- Exploit and PoC references, threat intelligence from 22 sources
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Severity by source
AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Primary rating from NVD · only source for this CVE.
CVSS VectorNVD
DescriptionNVD
NoMachine Server is affected by Buffer Overflow. IOCTL Handler 0x22001B in the NoMachine Server above 4.0.346 and below 7.7.4 allow local attackers to execute arbitrary code in kernel mode or cause a denial of service (memory corruption and OS crash) via specially crafted I/O Request Packet.
Threat Intelligence Overview
NVD
CVE.org
EPSS
How this decision was reached
The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.
What every action level means
SSVC AssessmentENISA
Priority Score
Attack Technique
A buffer overflow occurs when a program writes more data to a memory buffer than it was allocated to hold, causing the excess data to spill into adjacent memory regions.
Remote Code Execution represents the critical moment when an attacker successfully runs arbitrary code on a target system without physical access.
Denial of Service attacks render applications or systems unavailable by overwhelming resources or triggering failure conditions.
Affected Products (CPE)NVD
An unspecified server utility in NoMachine before 5.3.10 on Mac OS X and Linux allows authenticated users to gain privil
An arbitrary file overwrite vulnerability in NoMachine Free Edition and Enterprise Client for macOS before v8.8.1 allows
NoMachine Enterprise Client is affected by Integer Overflow. Rated high severity (CVSS 8.8), this vulnerability is low a
NoMachine Enterprise Client is affected by Buffer Overflow. Rated high severity (CVSS 8.8), this vulnerability is low at
NoMachine Cloud Server is affected by Buffer Overflow. Rated high severity (CVSS 8.8), this vulnerability is low attack
NoMachine Cloud Server is affected by Integer Overflow. Rated high severity (CVSS 8.8), this vulnerability is low attack
NoMachine Enterprise Desktop is affected by Integer Overflow. Rated high severity (CVSS 8.8), this vulnerability is low
NoMachine Enterprise Desktop is affected by Buffer Overflow. Rated high severity (CVSS 8.8), this vulnerability is low a
NoMachine Server is affected by Integer Overflow. Rated high severity (CVSS 8.8), this vulnerability is low attack compl
NoMachine before 5.3.27 and 6.x before 6.3.6 allows attackers to gain privileges via a Trojan horse wintab32.dll file lo
An uninitialised stack variable in the nxfuse component that is part of the Open Source DokanFS library shipped with NoM
Incorrect permissions for the folder C:\ProgramData\NoMachine\var\uninstall of Nomachine v7.9.2 allows attackers to perf
GitHub PoC
Exploit-DB