Cyber Resilience

CVE-2021-39244

HighPublic PoCRCE

Published: 23 August 2021

Published
23 August 2021
Modified
21 November 2024
KEV Added
Patch
CVSS Score v3.1 8.8 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
EPSS Score 0.0507 90.0th percentile
Risk Priority 21 60% EPSS · 20% KEV · 20% CVSS

Summary

CVE-2021-39244 is a high-severity OS Command Injection (CWE-78) vulnerability in Altus Nexto Nx3003 Firmware. Its CVSS base score is 8.8 (High).

Operationally, ranked in the top 10.0% of CVEs by exploit likelihood; it is not currently listed in the CISA KEV catalog; a public proof-of-concept is referenced.

EU & UK References

Vulnerability details

Authenticated Semi-Blind Command Injection (via Parameter Injection) exists on Altus Nexto, Nexto Xpress, and Hadron Xtorm devices via the getlogs.cgi tcpdump feature. This affects Nexto NX3003 1.8.11.0, Nexto NX3004 1.8.11.0, Nexto NX3005 1.8.11.0, Nexto NX3010 1.8.3.0, Nexto NX3020 1.8.3.0, Nexto…

more

NX3030 1.8.3.0, Nexto NX5100 1.8.11.0, Nexto NX5101 1.8.11.0, Nexto NX5110 1.1.2.8, Nexto NX5210 1.1.2.8, Nexto Xpress XP300 1.8.11.0, Nexto Xpress XP315 1.8.11.0, Nexto Xpress XP325 1.8.11.0, Nexto Xpress XP340 1.8.11.0, and Hadron Xtorm HX3040 1.7.58.0.

CWE(s)

Related Threats

No named actor attribution yet. ATT&CK technique mapping in progress for this CVE.

Affected Assets

altus
nexto nx3003 firmware
1.8.11.0
altus
nexto nx3004 firmware
1.8.11.0
altus
nexto nx3005 firmware
1.8.11.0
altus
nexto nx3010 firmware
1.8.3.0
altus
nexto nx3020 firmware
1.8.3.0
altus
nexto nx3030 firmware
1.8.3.0
altus
nexto nx5100 firmware
1.8.11.0
altus
nexto nx5101 firmware
1.8.11.0
altus
nexto nx5110 firmware
1.1.2.8
altus
nexto nx5210 firmware
1.1.2.8
+5 more product configuration(s) — see NVD for full list

Mitigating Controls

Likely Mitigating Controls AI

Per-CVE control mapping for this CVE has not run yet; the list below is derived from the weakness types (CWEs) cited in the NVD entry.

addresses: CWE-78

Platform-independent apps typically execute inside a managed runtime or sandbox that restricts direct OS command execution, reducing the ability to exploit OS command injection.

addresses: CWE-78

Validates inputs to block special elements that would alter OS command execution.

References