CVE-2021-39244

Exp

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 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.

Published: 2021-08-23 Last update: 2024-11-21 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2021-39244 is rated High Exploit Risk (76.5/100): CVSS High severity, with medium exploitation likelihood (EPSS 5.07%). 1 public exploit reference(s) are indexed (Exploit-DB). Public exploits are available—assess exposure, apply mitigations, and prioritize patching.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Public exploit references (Exploit-DB) for CVE-2021-39244

EDB-ID Source Kind Published Link
— nvd_ref exploit_tag Exploit-DB ↗

Exploit prediction scoring system (EPSS) score for CVE-2021-39244

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-01-15 13.24% 5.07% -8.17%
2 2025-11-21 18.27% 13.24% -5.03%
3 2025-11-18 — 18.27% —

Full EPSS history (26 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2021-39244

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
8.8 3.1 HIGH
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:L)
A normal user session is enough; they don’t have to be admin.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 2.8 5.9 [email protected]
9.0 2.0 HIGH
AV:N/AC:L/Au:S/C:C/I:C/A:C Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:L)
Exploitation conditions are straightforward and predictable.
Authentication (AU:S)
A single authentication is required.
Confidentiality impact (C:C)
Complete confidentiality impact.
Integrity impact (I:C)
Complete integrity impact.
Availability impact (A:C)
Complete availability impact.
 8.0 10.0 [email protected]

Weakness enumeration for CVE-2021-39244

Affected software / configurations for CVE-2021-39244

Vendor Product Version Raw CPE
altus nexto_nx3003_firmware 1.8.11.0 cpe:2.3:o:altus:nexto_nx3003_firmware:1.8.11.0:*:*:*:*:*:*:*
altus nexto_nx3004_firmware 1.8.11.0 cpe:2.3:o:altus:nexto_nx3004_firmware:1.8.11.0:*:*:*:*:*:*:*
altus nexto_nx3005_firmware 1.8.11.0 cpe:2.3:o:altus:nexto_nx3005_firmware:1.8.11.0:*:*:*:*:*:*:*
altus nexto_nx3010_firmware 1.8.3.0 cpe:2.3:o:altus:nexto_nx3010_firmware:1.8.3.0:*:*:*:*:*:*:*
altus nexto_nx3020_firmware 1.8.3.0 cpe:2.3:o:altus:nexto_nx3020_firmware:1.8.3.0:*:*:*:*:*:*:*
altus nexto_nx3030_firmware 1.8.3.0 cpe:2.3:o:altus:nexto_nx3030_firmware:1.8.3.0:*:*:*:*:*:*:*
altus nexto_nx5100_firmware 1.8.11.0 cpe:2.3:o:altus:nexto_nx5100_firmware:1.8.11.0:*:*:*:*:*:*:*
altus nexto_nx5101_firmware 1.8.11.0 cpe:2.3:o:altus:nexto_nx5101_firmware:1.8.11.0:*:*:*:*:*:*:*
altus nexto_nx5110_firmware 1.1.2.8 cpe:2.3:o:altus:nexto_nx5110_firmware:1.1.2.8:*:*:*:*:*:*:*
altus nexto_nx5210_firmware 1.1.2.8 cpe:2.3:o:altus:nexto_nx5210_firmware:1.1.2.8:*:*:*:*:*:*:*
altus nexto_xpress_xp300_firmware 1.8.11.0 cpe:2.3:o:altus:nexto_xpress_xp300_firmware:1.8.11.0:*:*:*:*:*:*:*
altus nexto_xpress_xp315_firmware 1.8.11.0 cpe:2.3:o:altus:nexto_xpress_xp315_firmware:1.8.11.0:*:*:*:*:*:*:*
altus nexto_xpress_xp325_firmware 1.8.11.0 cpe:2.3:o:altus:nexto_xpress_xp325_firmware:1.8.11.0:*:*:*:*:*:*:*
altus nexto_xpress_xp340_firmware 1.8.11.0 cpe:2.3:o:altus:nexto_xpress_xp340_firmware:1.8.11.0:*:*:*:*:*:*:*
altus hadron_xtorm_hx3040_firmware 1.7.58.0 cpe:2.3:o:altus:hadron_xtorm_hx3040_firmware:1.7.58.0:*:*:*:*:*:*:*

References for CVE-2021-39244

URL Tags
https://seclists.org/fulldisclosure/2021/Aug/21 Exploit Mailing List Third Party Advisory
https://www.altus.com.br/ Vendor Advisory
cvelogic Threat Intelligence