# CVE-2021-23853: Improper Input Validation of HTTP Headers

> Attackers can inject arbitrary HTTP headers via crafted URLs in Bosch IP cameras, potentially affecting request handling.

- **Severity:** High 8.3 (`CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** A user has to click or open something
- **Fix available:** No
- **Published:** 9 Jun 2021
- **Updated:** 17 Sep 2024
- **Also known as:** GHSA-9f38-8856-g696

## What is CVE-2021-23853?

CVE-2021-23853 is a high-severity vulnerability in Bosch CPP Firmware, published on 9 Jun 2021. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

### Official description

In Bosch IP cameras, improper validation of the HTTP header allows an attacker to inject arbitrary HTTP headers through crafted URLs.

Weakness: CWE-20 (Improper Input Validation)

## Which versions are affected by CVE-2021-23853?

It affects 5 products.


Products: Bosch Cpp13 Firmware, Bosch Cpp4 Firmware, Bosch Cpp6 Firmware, Bosch Cpp7.3 Firmware, Bosch Cpp7 Firmware.

## How do I fix CVE-2021-23853?

No fix has been published for CVE-2021-23853 yet. Limit exposure of the affected software until one is available.

## Is CVE-2021-23853 being exploited?

There is no known exploitation of CVE-2021-23853 in the wild and no public exploit code.

## Other vulnerabilities in Bosch CPP Firmware

- [CVE-2021-23848](https://insights.sbomify.com/CVE-2021-23848/): Reflected XSS in URL handler (high 8.3)
- [CVE-2021-23854](https://insights.sbomify.com/CVE-2021-23854/): Reflected XSS in page parameter (high 8.3)
- [CVE-2023-39509](https://insights.sbomify.com/CVE-2023-39509/): Command injection in Camera Firmware (high 7.2)
- [CVE-2022-41677](https://insights.sbomify.com/CVE-2022-41677/): Information disclosure in Camera Firmware (medium 5.3)
- [CVE-2023-32229](https://insights.sbomify.com/CVE-2023-32229/): Denial of service in Camera Firmware (medium 4.9)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-23853 and fix it if it is affected.

What it is: CVE-2021-23853 is a high-severity vulnerability in Bosch CPP Firmware, published on 9 Jun 2021. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2021-23853 in the wild and no public exploit code.

Affected product: Bosch CPP Firmware. 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-2021-23853/ (Markdown: https://insights.sbomify.com/CVE-2021-23853/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-23853
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-23853
- OSV: https://osv.dev/vulnerability/CVE-2021-23853

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-23853/
Summaries are generated and may contain mistakes; the official description above is the record.