# CVE-2020-27654: Command injection in Synology Router Manager (SRM)

> Remote attackers can execute arbitrary commands on Synology routers via specific TCP ports due to improper access control in the lbd service.

- **Severity:** Critical 9.8 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 29 Oct 2020
- **Updated:** 17 Sep 2024
- **Also known as:** GHSA-6qq4-j9r6-gj4w

## What is CVE-2020-27654?

CVE-2020-27654 is a critical command injection vulnerability in Synology Router Manager, published on 29 Oct 2020. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

Improper access control vulnerability in lbd in Synology Router Manager (SRM) before 1.2.4-8081 allows remote attackers to execute arbitrary commands via port (1) 7786/tcp or (2) 7787/tcp.

Weakness: CWE-269 (Improper Privilege Management)

## Which versions are affected by CVE-2020-27654?

It affects 1 product.


Products: Synology Router Manager.

## How do I fix CVE-2020-27654?

No fix has been published for CVE-2020-27654 yet. Limit exposure of the affected software until one is available.

## Is CVE-2020-27654 being exploited?

There is no known exploitation of CVE-2020-27654 in the wild and no public exploit code.

## Other vulnerabilities in Synology Router Manager

- [CVE-2023-32956](https://insights.sbomify.com/CVE-2023-32956/): Command injection in Synology Router Manager (SRM) (critical 9.8)
- [CVE-2019-11823](https://insights.sbomify.com/CVE-2019-11823/): Denial of service in Synology Router Manager (SRM) (high 8.6)
- [CVE-2020-27649](https://insights.sbomify.com/CVE-2020-27649/): Security feature bypass in Synology Router Manager (SRM) (high 8.3)
- [CVE-2024-11398](https://insights.sbomify.com/CVE-2024-11398/): Path traversal in Synology Router Manager (SRM) (high 8.1)
- [CVE-2023-32955](https://insights.sbomify.com/CVE-2023-32955/): Command injection in Synology Router Manager (SRM) (high 8.1)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2020-27654 and fix it if it is affected.

What it is: CVE-2020-27654 is a critical command injection vulnerability in Synology Router Manager, published on 29 Oct 2020. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2020-27654 in the wild and no public exploit code.

Affected product: Synology Router Manager. 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-2020-27654/ (Markdown: https://insights.sbomify.com/CVE-2020-27654/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2020-27654
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2020-27654
- OSV: https://osv.dev/vulnerability/CVE-2020-27654

---
From sbomify Insights: https://insights.sbomify.com/CVE-2020-27654/
Summaries are generated and may contain mistakes; the official description above is the record.