CVE-2020-21992

Exp

Inim Electronics SmartLiving SmartLAN/G/SI <=6.x suffers from an authenticated remote command injection vulnerability. The issue exist due to the 'par' POST parameter not being sanitized when called with the 'testemail' module through web.cgi binary. The vulnerable CGI binary (ELF 32-bit LSB executable, ARM) is calling the 'sh' executable via the system() function to issue a command using the mailx service and its vulnerable string format parameter allowing for OS command injection with root privileges. An attacker can remotely execute system commands as the root user using default credentials and bypass access controls in place.

Published: 2021-04-29 Last update: 2024-11-21 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2020-21992 is rated High Exploit Risk (80.2/100): CVSS High severity, with medium exploitation likelihood (EPSS 3.25%). 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-2020-21992

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

Exploit prediction scoring system (EPSS) score for CVE-2020-21992

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 2026-05-01 3.75% 3.25% -0.50%
2 2025-12-05 4.45% 3.75% -0.71%
3 2025-03-30 — 4.45% —

Full EPSS history (15 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2020-21992

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-2020-21992

Affected software / configurations for CVE-2020-21992

Vendor Product Version Raw CPE
inim smartliving_505_firmware <= 6.0 cpe:2.3:o:inim:smartliving_505_firmware:*:*:*:*:*:*:*:*
inim smartliving_515_firmware <= 6.0 cpe:2.3:o:inim:smartliving_515_firmware:*:*:*:*:*:*:*:*
inim smartliving_1050_firmware <= 6.0 cpe:2.3:o:inim:smartliving_1050_firmware:*:*:*:*:*:*:*:*
inim smartliving_1050g3_firmware <= 6.0 cpe:2.3:o:inim:smartliving_1050g3_firmware:*:*:*:*:*:*:*:*
inim smartliving_10100l_firmware <= 6.0 cpe:2.3:o:inim:smartliving_10100l_firmware:*:*:*:*:*:*:*:*
inim smartliving_10100lg3_firmware <= 6.0 cpe:2.3:o:inim:smartliving_10100lg3_firmware:*:*:*:*:*:*:*:*

References for CVE-2020-21992

cvelogic Threat Intelligence