CVE-2021-42973 describes an integer overflow vulnerability in NoMachine Server versions above 4.0.346 and below 7.7.4. This flaw, residing in IOCTL Handler 0x22001B, allows a local attacker to achieve arbitrary code execution in kernel mode or trigger a denial of service through memory corruption and OS crash using a specially crafted I/O Request Packet. With a CVSS score of 8.8 (HIGH), the vulnerability has a low attack complexity and requires local privileges, but can lead to high impact on confidentiality, integrity, and availability. While there is no evidence of active exploitation or public exploit code (Metasploit, Nuclei, ExploitDB), it has garnered some community discussion and media coverage, indicating awareness within the cybersecurity community.
| Vendor | Product | Version(s) | CPE |
|---|---|---|---|
> 4.0.346, < 7.7.4CPE matchmatch criteria | cpe:2.3:a:nomachine:server:*:*:*:*:*:*:*:* |
CVSS version used by this source: 3.1
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.2 Bluesky, 0.1 Mastodon, and 0.2 GitHub mentions.
The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.
Remediation records are not available for this CVE.