CVE-2021-33436 json
NoMachine for Windows prior to version 6.15.1 and 7.5.2 suffer from local privilege escalation due to the lack of safe DLL loading.
published 2022-04-28 4 y ago modified 2026-06-17 4 mo ago also EUVD-2021-20140
- cvss
- 7.3
- version 3.1, NVD
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.3%
- EPSS 0.3% chance of exploitation in 30 days, percentile 21%
- public exploits
- 0
- none known
Summary
NoMachine for Windows prior to version 6.15.1 and 7.5.2 suffer from local privilege escalation due to the lack of safe DLL loading. This vulnerability allows local non-privileged users to perform DLL Hijacking via any writable directory listed under the system path and ultimately execute code as NT AUTHORITY\SYSTEM.
Patch / fix
- nomachine nomachine 6.15.1, 7.5.2
Exploit prediction
0.29% chance of exploitation in the next 30 days, higher than 21% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| NVD | 3.1 | 7.3 | CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H |
| NVD | 2.0 | 6.2 | AV:L/AC:H/Au:N/C:C/I:C/A:C |
References
-
knowledgebase.nomachine.com
/TR05S10236
vendor-advisory
-
knowledgebase.nomachine.com
/SU05S00224
release-notes, vendor-advisory
-
knowledgebase.nomachine.com
/SU05S00223
release-notes, vendor-advisory
-
github.com
/active-labs/Advisories/blob/master/2021/ACTIVE-2021-001.md
third-party-advisory
Sources
- CVE List CVE-2021-33436
- NVD CVE-2021-33436
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.