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High severity8.8NVD Advisory· Published Dec 7, 2021· Updated Jun 17, 2026

CVE-2021-42973

CVE-2021-42973

Description

NoMachine Server is affected by Integer 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.

AI Insight

LLM-synthesized narrative grounded in this CVE's description and references.

Affected products

3
  • Nomachine/Server
    cpe:2.3:a:nomachine:server:*:*:*:*:*:*:*:*
    Range: >4.0.346,<7.7.4
  • NoMachine/NoMachine Serverdescription
  • Nomachine/Nomachinellm-fuzzy
    Range: >4.0.346 and <7.7.4

Patches

Vulnerability mechanics

References

1

News mentions

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