# CVE-2021-22143: Elastic APM .NET Agent information disclosure

> Attackers can obtain sensitive HTTP header information leaked by the Elastic APM .NET Agent during application error logging.

- **Severity:** Low 2.1 (`CVSS:3.1/AV:A/AC:L/PR:H/UI:R/S:U/C:L/I:N/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** An administrator
- **Attackable:** Local or same network only
- **Victim action needed:** A user has to click or open something
- **Fix available:** Yes
- **Published:** 22 Nov 2023
- **Updated:** 11 Oct 2024
- **Also known as:** GHSA-hx93-gc73-5rpr

## What is CVE-2021-22143?

CVE-2021-22143 is a low-severity vulnerability in Elastic APM .NET Agent, published on 22 Nov 2023. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.

### Official description

The Elastic APM .NET Agent can leak sensitive HTTP header information when logging the details during an application error. Normally, the APM agent will sanitize sensitive HTTP header details before sending the information to the APM server. During an application error it is possible the headers will not be sanitized before being sent.

Weakness: CWE-532 (Insertion of Sensitive Information into Log File), CWE-200 (Exposure of Sensitive Information to an Unauthorized Actor)

## Which versions are affected by CVE-2021-22143?

2 open source packages ship an affected version, including Elastic.Apm. It affects 1 product.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `Elastic.Apm` | NuGet | All versions | 1.10.0 |
| `Elastic.Apm` | NuGet | All versions | 1.10.0 |

Products: Elastic Apm .Net Agent.

## How do I fix CVE-2021-22143?

Upgrade Elastic.Apm to 1.10.0 or later.

## Is CVE-2021-22143 being exploited?

There is no known exploitation of CVE-2021-22143 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-22143 and fix it if it is affected.

What it is: CVE-2021-22143 is a low-severity vulnerability in Elastic APM .NET Agent, published on 22 Nov 2023. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2021-22143 in the wild and no public exploit code.

Affected packages and fixed versions:
- Elastic.Apm (NuGet): affected all versions; fixed in 1.10.0
- Elastic.Apm (NuGet): affected all versions; fixed in 1.10.0

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-2021-22143/ (Markdown: https://insights.sbomify.com/CVE-2021-22143/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-22143
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-22143
- OSV: https://osv.dev/vulnerability/CVE-2021-22143

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-22143/
Summaries are generated and may contain mistakes; the official description above is the record.