CVE-2020-36910

HighPublic PoCRCE

Published: 06 January 2026

Published

06 January 2026

Modified

15 April 2026

KEV Added

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Patch

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CVSS Score 8.8 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS Score 0.0053 67.6th percentile

Risk Priority 18 60% EPSS · 20% KEV · 20% CVSS

Summary

CVE-2020-36910 is a high-severity OS Command Injection (CWE-78) vulnerability in Cxsecurity (inferred from references). Its CVSS base score is 8.8 (High).

Operationally, exploitation aligns with the MITRE ATT&CK technique Exploit Public-Facing Application (T1190); ranked in the top 32.4% of CVEs by exploit likelihood; it is not currently listed in the CISA KEV catalog; a public proof-of-concept is referenced.

The strongest mitigations our analysis identified are NIST 800-53 SI-10 (Information Input Validation) and SI-2 (Flaw Remediation).

Threat & Defense at a Glance

What attackers do: exploitation maps to Exploit Public-Facing Application (T1190) and 2 other techniques. What defenders deploy: see the NIST 800-53 controls recommended below.

Threat & Defense Details

Mitigating Controls (NIST 800-53 r5)AI

SI-2 Flaw Remediation good match

prevent

Directly mitigates CVE-2020-36910 by identifying, patching, or updating the vulnerable CGI scripts to eliminate the command injection flaw.

SI-10 Information Input Validation good match

prevent

Prevents exploitation of the NTP_Server_IP parameter by validating inputs to reject command injection payloads containing shell metacharacters.

AC-2 Account Management partial match

prevent

Reduces attack surface by disabling default credentials or enforcing strong account management, hindering authenticated access needed to exploit the vulnerability.

MITRE ATT&CK Enterprise TechniquesAI

T1190 Exploit Public-Facing Application Initial Access

Adversaries may attempt to exploit a weakness in an Internet-facing host or system to initially access a network.

attack.mitre.org →

T1059.004 Unix Shell Execution

Adversaries may abuse Unix shell commands and scripts for execution.

attack.mitre.org →

T1068 Exploitation for Privilege Escalation Privilege Escalation

Adversaries may exploit software vulnerabilities in an attempt to elevate privileges.

attack.mitre.org →

Why these techniques?

Authenticated remote command injection in web CGI endpoints enables exploitation of public-facing application (T1190), arbitrary Unix shell execution (T1059.004), and privilege escalation from low-priv to root (T1068).

Confidence: HIGH · MITRE ATT&CK Enterprise v19.0

NVD Description

Cayin Signage Media Player 3.0 contains an authenticated remote command injection vulnerability in system.cgi and wizard_system.cgi pages. Attackers can exploit the 'NTP_Server_IP' parameter with default credentials to execute arbitrary shell commands as root.

Deeper analysisAI

CVE-2020-36910 is an authenticated remote command injection vulnerability (CWE-78) affecting Cayin Signage Media Player 3.0, specifically in the system.cgi and wizard_system.cgi pages. The flaw resides in the 'NTP_Server_IP' parameter, which attackers can exploit using default credentials to execute arbitrary shell commands as root. Published on 2026-01-06, it carries a CVSS v3.1 base score of 8.8 (AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H), indicating high severity due to its network accessibility, low complexity, and potential for complete system compromise.

An attacker requires network access to the affected device and valid low-privilege credentials, such as the defaults provided by the software. Once authenticated, they can submit a malicious payload via the vulnerable 'NTP_Server_IP' parameter in the specified CGI pages, leading to remote code execution with root privileges. This grants high-impact control over confidentiality, integrity, and availability, allowing arbitrary command execution on the target system.

Advisories and additional details, including potential exploits, are documented in references such as https://cxsecurity.com/issue/WLB-2020060049, https://exchange.xforce.ibmcloud.com/vulnerabilities/182924, https://packetstorm.news/files/id/157942, https://www.cayintech.com, and https://www.exploit-db.com/exploits/48557. Security practitioners should consult these sources and the vendor for patch availability or mitigation guidance.