How severe is CVE-2020-21992?

CVE-2020-21992 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2020-21992 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 5% (92nd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2020-21992?

CVE-2020-21992 primarily affects Inim Smartliving 505 Firmware. In total, 6 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2020-21992?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2020-21992 published?

CVE-2020-21992 was published on 2021-04-29 and last updated on 2026-06-17.

CVE-2020-21992

CVE-2020-21992 is a high-severity vulnerability in Inim Smartliving 505 Firmware with a CVSS 3.x base score of 8.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-78.

Key facts

Severity: High (CVSS 3.x base score 8.8)
CVSS v2: 9.0
EPSS exploit prediction: 5% (92nd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-78
Affected product: Inim Smartliving 505 Firmware
Published: 2021-04-29
Last modified: 2026-06-17

Description

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.

Frequently asked questions

What is CVE-2020-21992?: 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.
How severe is CVE-2020-21992?: CVE-2020-21992 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2020-21992 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 5% (92nd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2020-21992?: CVE-2020-21992 primarily affects Inim Smartliving 505 Firmware. In total, 6 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2020-21992?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2020-21992 published?: CVE-2020-21992 was published on 2021-04-29 and last updated on 2026-06-17.

References

https://www.zeroscience.mk/en/vulnerabilities/ZSL-2019-5544.php

Affected products (6)

cpe:2.3:o:inim:smartliving_505_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:inim:smartliving_515_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:inim:smartliving_1050_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:inim:smartliving_1050g3_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:inim:smartliving_10100l_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:inim:smartliving_10100lg3_firmware:*:*:*:*:*:*:*:*

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