Security readout for executives and security teams
Plain-English summary
CVE-2020-7357 lets an authenticated user execute operating-system commands as root on affected Cayin CMS systems, reportedly through a vulnerable NTP server setting. The biggest concern is remote management exposure combined with default credentials. Sources do not show CISA KEV listing or confirmed active exploitation.
Executive priority
Treat this as urgent for any exposed or default-credential Cayin CMS deployment. Root command execution can compromise the system and trusted content workflows. Prioritize discovery, credential hardening, access restriction, and vendor remediation checks.
Technical view
The issue is CWE-78 command injection in Cayin CMS system.cgi, tied to the NTP_Server_IP POST parameter. CVSS 3.1 is 9.6, with network access, low privileges, no user interaction, scope change, and high confidentiality and integrity impact. Affected branches include CMS-SE, CMS-60, CMS-40, CMS-20, and CMS 7.5 through 8.2 builds listed in the record.
Likely exposure
Exposure is most likely in organizations running affected Cayin CMS digital signage management products, especially if administrative interfaces are reachable over a network and default credentials remain usable. The source bundle does not provide CPEs, deployment prevalence, or a vendor patch matrix.
Exploitation context
The vulnerability requires authentication, but the description specifically references default credentials. A Rapid7 Metasploit pull request is cited, indicating public exploit research exists. The provided data says KEV is false, so active exploitation should not be claimed from these sources.
Researcher notes
Evidence supports authenticated, semi-blind OS command injection as root via NTP_Server_IP in system.cgi. Public references include ZeroScience, IBM X-Force, and a Rapid7 Metasploit PR. The provided bundle does not confirm active exploitation, patch availability, or all affected releases beyond the listed builds.
Mitigation direction
- Check Cayin and IBM X-Force guidance for fixed builds or official remediation.
- Change default credentials on all Cayin CMS systems immediately.
- Restrict CMS administrative access to trusted management networks or VPNs.
- Remove internet exposure for affected CMS interfaces where possible.
- Prioritize upgrades or replacement for listed affected builds.
- Monitor administrative actions until remediation is complete.
Validation and detection
- Inventory Cayin CMS products and record exact model, branch, and build.
- Compare versions against the affected build list in the CVE record.
- Confirm default credentials are disabled or rotated.
- Review whether CMS administration is reachable from untrusted networks.
- Check logs for suspicious authenticated changes to NTP settings.
- Document compensating controls where patches are unavailable.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-78: Command execution behavior lookup
Command injection weaknesses can lead defenders to review execution techniques and command interpreter telemetry. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupExecution behavior lookup
The CVE wording references code or command execution, so execution technique review may help defensive triage. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2020-7357 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Critical
- CVSS
- 9.6 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N3.15.8Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
9.6CriticalVector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N
Source materials
- CVE List V5 sourceCVE List V5
- https://github.com/rapid7/metasploit-framework/pull/13607CVE reference · x_refsource_MISC
- https://www.zeroscience.mk/en/vulnerabilities/ZSL-2020-5570.phpCVE reference · x_refsource_MISC
- https://exchange.xforce.ibmcloud.com/vulnerabilities/182925CVE reference · vendor-advisory, x_refsource_IBM
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection') represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.