CVE-2020-21999

Exp

iWT Ltd FaceSentry Access Control System 6.4.8 suffers from an authenticated OS command injection vulnerability using default credentials. This can be exploited to inject and execute arbitrary shell commands as the root user via the 'strInIP' POST parameter in pingTest PHP script.

Published: 2021-05-04 Last update: 2024-11-21 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2020-21999 is rated High Exploit Risk (86.1/100): CVSS High severity, with high exploitation likelihood (EPSS 20.29%, 95th percentile). 2 public exploit reference(s) are indexed (Exploit-DB). EPSS rose +2.53% over the last day, indicating growing attacker interest. 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-2020-21999

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

Exploit prediction scoring system (EPSS) score for CVE-2020-21999

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 2025-11-21 17.76% 20.29% +2.53%
2 2025-11-18 20.29% 17.76% -2.53%
3 2025-10-16 — 20.29% —

Full EPSS history (43 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2020-21999

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-2020-21999

Affected software / configurations for CVE-2020-21999

Vendor Product Version Raw CPE
iwt facesentry_access_control_system_firmware 5.7.0 cpe:2.3:o:iwt:facesentry_access_control_system_firmware:5.7.0:*:*:*:*:*:*:*
iwt facesentry_access_control_system_firmware 5.7.2 cpe:2.3:o:iwt:facesentry_access_control_system_firmware:5.7.2:*:*:*:*:*:*:*
iwt facesentry_access_control_system_firmware 6.4.8 cpe:2.3:o:iwt:facesentry_access_control_system_firmware:6.4.8:*:*:*:*:*:*:*

References for CVE-2020-21999

URL Tags
https://www.exploit-db.com/exploits/47066 Exploit Third Party Advisory VDB Entry
https://www.zeroscience.mk/en/vulnerabilities/ZSL-2019-5525.php Exploit Third Party Advisory
cvelogic Threat Intelligence