# CVE-2021-23859: Denial of Service and Authentication Bypass Vulnerability in multiple Bosch products

> Unauthenticated attackers can crash a service via HTTP requests, potentially enabling further unauthenticated command execution in specific Bosch video management configurations.

- **Severity:** Critical 9.1 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/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:** 8 Dec 2021
- **Updated:** 16 Sep 2024
- **Also known as:** GHSA-w9fc-5fg9-fgph

## What is CVE-2021-23859?

CVE-2021-23859 is a critical denial of service vulnerability in Bosch AEC, published on 8 Dec 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

An unauthenticated attacker is able to send a special HTTP request, that causes a service to crash. In case of a standalone VRM or BVMS with VRM installation this crash also opens the possibility to send further unauthenticated commands to the service. On some products the interface is only local accessible lowering the CVSS base score. For a list of modified CVSS scores, please see the official Bosch Advisory Appendix chapter Modified CVSS Scores for CVE-2021-23859

Weakness: CWE-755 (Improper Handling of Exceptional Conditions), CWE-703 (Improper Check or Handling of Exceptional Conditions)

## Which versions are affected by CVE-2021-23859?

It affects 6 products.


Products: Bosch Access Easy Controller Firmware, Bosch Access Professional Edition, Bosch Bosch Video Management System, Bosch Building Integration System, Bosch Video Recording Manager, Bosch Video Recording Manager Exporter.

## How do I fix CVE-2021-23859?

No fix has been published for CVE-2021-23859 yet. Limit exposure of the affected software until one is available.

## Is CVE-2021-23859 being exploited?

There is no known exploitation of CVE-2021-23859 in the wild and no public exploit code.

## Other vulnerabilities in Bosch AEC

- [CVE-2019-6957](https://insights.sbomify.com/CVE-2019-6957/): Buffer Overflow for Bosch Video Systems, PSIM and Access Control Systems (critical 9.8)
- [CVE-2019-6958](https://insights.sbomify.com/CVE-2019-6958/): Improper Access Control for Bosch Video Systems, PSIM and Access Control Systems (critical 9.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-23859 and fix it if it is affected.

What it is: CVE-2021-23859 is a critical denial of service vulnerability in Bosch AEC, published on 8 Dec 2021. 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-2021-23859 in the wild and no public exploit code.

Affected product: Bosch AEC. 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-2021-23859/ (Markdown: https://insights.sbomify.com/CVE-2021-23859/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-23859
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-23859
- OSV: https://osv.dev/vulnerability/CVE-2021-23859

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-23859/
Summaries are generated and may contain mistakes; the official description above is the record.