# CVE-2021-22733: Privilege escalation in homeLYnk (Wiser For KNX) and spaceLYnk V2.60 and prior

> Attackers can gain shell access and execute arbitrary code by loading unauthorized files into the system folder of Schneider homeLYnk and spaceLYnk devices.

- **Severity:** High 7.8 (`CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 26 May 2021
- **Updated:** 3 Aug 2024
- **Also known as:** GHSA-6xx3-j36r-9j4v

## What is CVE-2021-22733?

CVE-2021-22733 is a high-severity vulnerability in homeLYnk (Wiser For KNX) and spaceLYnk V2.60 and prior, published on 26 May 2021. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

Improper Privilege Management vulnerability exists in homeLYnk (Wiser For KNX) and spaceLYnk V2.60 and prior which could cause shell access when unauthorized code is loaded into the system folder.

Weakness: CWE-269 (Improper Privilege Management)

## Which versions are affected by CVE-2021-22733?

It affects 2 products.


Products: Schneider-Electric Homelynk Firmware, Schneider-Electric Spacelynk Firmware.

## How do I fix CVE-2021-22733?

No fix has been published for CVE-2021-22733 yet. Limit exposure of the affected software until one is available.

## Is CVE-2021-22733 being exploited?

There is no known exploitation of CVE-2021-22733 in the wild and no public exploit code.

## Other vulnerabilities in homeLYnk (Wiser For KNX) and spaceLYnk V2.60 and prior

- [CVE-2021-22737](https://insights.sbomify.com/CVE-2021-22737/): Hardcoded credentials in homeLYnk (Wiser For KNX) and spaceLYnk V2.60 and prior (critical 9.8)
- [CVE-2021-22738](https://insights.sbomify.com/CVE-2021-22738/): Weak cryptography in homeLYnk (Wiser For KNX) and spaceLYnk V2.60 and prior (critical 9.8)
- [CVE-2021-22732](https://insights.sbomify.com/CVE-2021-22732/): Privilege escalation in homeLYnk (Wiser For KNX) and spaceLYnk V2.60 and prior (high 7.8)
- [CVE-2021-22736](https://insights.sbomify.com/CVE-2021-22736/): Path traversal in homeLYnk (Wiser For KNX) and spaceLYnk V2.60 and prior (high 7.5)
- [CVE-2018-7779](https://insights.sbomify.com/CVE-2018-7779/): Auth bypass in Wiser for KNX (high 7.5)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-22733 and fix it if it is affected.

What it is: CVE-2021-22733 is a high-severity vulnerability in homeLYnk (Wiser For KNX) and spaceLYnk V2.60 and prior, published on 26 May 2021. It can only be exploited from the same machine or local network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2021-22733 in the wild and no public exploit code.

Affected product: homeLYnk (Wiser For KNX) and spaceLYnk V2.60 and prior. 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-2021-22733/ (Markdown: https://insights.sbomify.com/CVE-2021-22733/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-22733
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-22733
- OSV: https://osv.dev/vulnerability/CVE-2021-22733

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-22733/
Summaries are generated and may contain mistakes; the official description above is the record.