# CVE-2018-21019: Home Assistant information disclosure vulnerability

> Unauthenticated attackers can read application error logs in Home Assistant, potentially exposing sensitive information.

- **Severity:** High 7.5 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 23 Sep 2019
- **Updated:** 5 Aug 2024
- **Also known as:** GHSA-mh78-8f49-vjg3, PYSEC-2019-221

## What is CVE-2018-21019?

CVE-2018-21019 is a high-severity vulnerability in n/a, published on 23 Sep 2019. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

Home Assistant before 0.67.0 was vulnerable to an information disclosure that allowed an unauthenticated attacker to read the application's error log via components/api.py.

Weakness: CWE-200 (Exposure of Sensitive Information to an Unauthorized Actor)

## Which versions are affected by CVE-2018-21019?

3 open source packages ship an affected version, including homeassistant. It affects 1 product.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `homeassistant` | PyPI | All versions | 0.67.0 |
| `homeassistant` | PyPI | All versions | 0.67.0 |
| `homeassistant` | PyPI | All versions | 0.67.0 |

Products: Home-Assistant Home-Assistant.

## How do I fix CVE-2018-21019?

Upgrade homeassistant to 0.67.0 or later.

## Is CVE-2018-21019 being exploited?

There is no known exploitation of CVE-2018-21019 in the wild and no public exploit code.

## Other vulnerabilities in n/a

- [CVE-2023-27482](https://insights.sbomify.com/CVE-2023-27482/): Auth bypass in core (critical 10.0)
- [CVE-2023-41895](https://insights.sbomify.com/CVE-2023-41895/): Cross-site Scripting via auth_callback login in Home Assistant Core (high 8.8)
- [CVE-2023-41897](https://insights.sbomify.com/CVE-2023-41897/): Lack of XFO header allows clickjacking in Home Assistant Core (high 8.8)
- [CVE-2026-54317](https://insights.sbomify.com/CVE-2026-54317/): Home Assistant: Konnected alarm-panel switch state and zone topology disclosed to unauthenticated actors on the LAN (high 7.6)
- [CVE-2020-36517](https://insights.sbomify.com/CVE-2020-36517/): Information disclosure in n/a (high 7.5)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2018-21019 and fix it if it is affected.

What it is: CVE-2018-21019 is a high-severity vulnerability in n/a, published on 23 Sep 2019. 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-2018-21019 in the wild and no public exploit code.

Affected packages and fixed versions:
- homeassistant (PyPI): affected all versions; fixed in 0.67.0
- homeassistant (PyPI): affected all versions; fixed in 0.67.0
- homeassistant (PyPI): affected all versions; fixed in 0.67.0

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-2018-21019/ (Markdown: https://insights.sbomify.com/CVE-2018-21019/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2018-21019
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2018-21019
- OSV: https://osv.dev/vulnerability/CVE-2018-21019

---
From sbomify Insights: https://insights.sbomify.com/CVE-2018-21019/
Summaries are generated and may contain mistakes; the official description above is the record.