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Fencer Intel
critical 9.6

CVE-2020-7357 in the critical feed json

Cayin CMS Command Injection

published 6y ago modified 4mo ago also EUVD-2020-28484

cvss
9.6
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
32.1%
EPSS 32.1% chance of exploitation in 30 days, percentile 98%
public exploits
1
Metasploit

Summary

Cayin CMS suffers from an authenticated OS semi-blind command injection vulnerability using default credentials. This can be exploited to inject and execute arbitrary shell commands as the root user through the 'NTP_Server_IP' HTTP POST parameter in system.cgi page. This issue affects several branches and versions of the CMS application, including CME-SE, CMS-60, CMS-40, CMS-20, and CMS version 8.2, 8.0, and 7.5.

Patch / fix

Is CVE-2020-7357 in your stack? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.

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Timeline

  1. First public exploit (Metasploit exploit/linux/http/cayin_cms_ntp)
  2. Published

Exploit prediction

32.09% chance of exploitation in the next 30 days, higher than 98% of all scored CVEs (FIRST EPSS, 2026-11-09).

Exploits and checks

  • Metasploit exploit/linux/http/cayin_cms_ntp Cayin CMS NTP Server RCE metasploit exploit, excellent rank, 2020-06-04
  • github.com https://github.com/rapid7/metasploit-framework/pull/13607 referenced PoC, tagged "exploit" by a source, unverified
  • zeroscience.mk https://www.zeroscience.mk/en/vulnerabilities/ZSL-2020-5570.php referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CNA 3.1 9.6 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N
NVD 3.1 9.9 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
NVD 2.0 9.0 AV:N/AC:L/Au:S/C:C/I:C/A:C

Affected products

  • Cayin Technology Cayin CMS-SE
  • Cayin Technology Cayin CMS-60
  • Cayin Technology Cayin CMS-40
  • Cayin Technology Cayin CMS-20
  • Cayin Technology Cayin CMS

Classification

Weakness
  • CWE-78 Improper Neutralization of Special Elements used in an OS Command

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.