# CVE-2020-7357: Cayin CMS Command Injection

> Authenticated attackers can execute arbitrary shell commands as root via the NTP server IP parameter in Cayin CMS.

- **Severity:** Critical 9.6 (`CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 6 Aug 2020
- **Updated:** 17 Sep 2024
- **Also known as:** GHSA-7qhp-fg3p-fvch

## What is CVE-2020-7357?

CVE-2020-7357 is a critical command injection vulnerability in Cayin CMS, published on 6 Aug 2020. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

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.

Weakness: CWE-78 (Improper Neutralization of Special Elements used in an OS Command)

## Which versions are affected by CVE-2020-7357?

It affects 6 products.


Products: Cayintech Cms, Cayintech Cms-20 Firmware, Cayintech Cms-40 Firmware, Cayintech Cms-60 Firmware, Cayintech Cms-Se-Lxc Firmware, Cayintech Cms-Se Firmware.

## How do I fix CVE-2020-7357?

No fix has been published for CVE-2020-7357 yet. Limit exposure of the affected software until one is available.

## Is CVE-2020-7357 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2020-7357 exists.

Public exploit code:

- Cayin CMS NTP Server RCE (metasploit)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2020-7357 and fix it if it is affected.

What it is: CVE-2020-7357 is a critical command injection vulnerability in Cayin CMS, published on 6 Aug 2020. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2020-7357 exists.

Affected product: Cayin CMS. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2020-7357/ (Markdown: https://insights.sbomify.com/CVE-2020-7357/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2020-7357
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2020-7357
- OSV: https://osv.dev/vulnerability/CVE-2020-7357

---
From sbomify Insights: https://insights.sbomify.com/CVE-2020-7357/
Summaries are generated and may contain mistakes; the official description above is the record.