CVE-2020-7357: Cayin CMS suffers from an authenticated OS semi-blind command injection vulnerability using default credential

This week

CRITICAL 9.6MITIGATEMITIGATEMITIGATE

CVE-2020-7357 is a critical-severity flaw (CVSS 9.6) affecting cms-se firmware, cms-se-lxc firmware, cms-60 firmware. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

Critical severity
EPSS top 2%: very likely to be exploited
Public exploit reference

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	9.6 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	32.1% (top 2%)
CISA exploited list	No
Weakness	CWE-78
Published	2020-08-06
Last modified	2026-06-17

Publisher (CNA): Rapid7, Inc. · Vendor: cayintech

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2020-08-06 16:15 UTCPublished CVE record published
2026-06-17 03:24 UTCUpdated Record last modified

cayintech cms-se firmware MITIGATE

Affected: 11.0 19179 · 11.0 19025 · 11.0 18325

Fixed in: no fixed release known

Safe to downgrade to: a release before 11.0

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

cayintech cms-se-lxc firmware MITIGATE

Affected: all versions

Fixed in: no fixed release known

Safe to downgrade to: no unaffected older release

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

cayintech cms-60 firmware MITIGATE

Affected: 11.0 19025

Fixed in: no fixed release known

Safe to downgrade to: a release before 11.0

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

cayintech cms-40 firmware MITIGATE

Affected: 9.0 14197 · 9.0 14199 · 9.0 14093

Fixed in: no fixed release known

Safe to downgrade to: a release before 9.0

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

cayintech cms-20 firmware MITIGATE

Affected: 9.0 14197 · 9.0 14092

Fixed in: no fixed release known

Safe to downgrade to: a release before 9.0

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

cayintech cms MITIGATE

Affected: 7.5 11175 · 8.0 11175 · 8.2 12199

Fixed in: no fixed release known

Safe to downgrade to: a release before 7.5

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

Public exploits and detection

Public code exists for this CVE. Treat unpatched systems as at risk, and only run PoCs in a lab.

Metasploit: Cayin CMS NTP Server RCE

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2020-7357?

cms-se firmware: mitigate or apply the listed mitigation; cms-se-lxc firmware: mitigate or apply the listed mitigation; cms-60 firmware: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2020-7357 being exploited?

CVE-2020-7357 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2020-7357 affect?

CVE-2020-7357 affects cms-se firmware, cms-se-lxc firmware, cms-60 firmware. Severity is critical (CVSS 9.6). 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 par

How urgent is CVE-2020-7357?

Priority 63/100. Critical severity; EPSS top 2%: very likely to be exploited; Public exploit reference

References

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