Cayin CMS Command Injection

published 2020-08-06 6 y ago modified 2026-06-17 4 mo 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

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

links 1

github.com/rapid7/metasploit-framework#13607 pull request

Timeline

2020-06-04 First public exploit (Metasploit exploit/linux/http/cayin_cms_ntp)
2020-08-06 Published

Exploit prediction

32.09% chance of exploitation in the next 30 days, higher than 98% of all scored CVEs (FIRST EPSS, 2026-11-08).

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

github.com /rapid7/metasploit-framework/pull/13607
exploit, patch
zeroscience.mk /en/vulnerabilities/ZSL-2020-5570.php
exploit, third-party-advisory
exchange.xforce.ibmcloud.com /vulnerabilities/182925
vendor-advisory, third-party-advisory, vdb-entry

Sources

CVE List CVE-2020-7357
NVD CVE-2020-7357

Fencer Vulns 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.

Summary