# CVE-2021-33683: Other in SAP Web Dispatcher and Internet Communication Manager

> Attackers can exploit HTTP request smuggling to bypass firewalls and intercept sensitive data like session credentials in SAP Web Dispatcher.

- **Severity:** Medium 5.4 (`CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 14 Jul 2021
- **Updated:** 3 Aug 2024
- **Also known as:** GHSA-wp36-xpj5-g4w9

## What is CVE-2021-33683?

CVE-2021-33683 is a medium-severity vulnerability in SAP Web Dispatcher and Internet Communication Manager, published on 14 Jul 2021. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

SAP Web Dispatcher and Internet Communication Manager (ICM), versions - KRNL32NUC 7.21, 7.21EXT, 7.22, 7.22EXT, KRNL32UC 7.21, 7.21EXT, 7.22, 7.22EXT, KRNL64NUC 7.21, 7.21EXT, 7.22, 7.22EXT, 7.49, KRNL64UC 7.21, 7.21EXT, 7.22, 7.22EXT, 7.49, 7.53, 7.73, WEBDISP 7.53, 7.73, 7.77, 7.81, 7.82, 7.83, KERNEL 7.21, 7.22, 7.49, 7.53, 7.73, 7.77, 7.81, 7.82, 7.83, process invalid HTTP header. The incorrect handling of the invalid Transfer-Encoding header in a particular manner leads to a possibility of HTTP Request Smuggling attack. An attacker could exploit this vulnerability to bypass web application firewall protection, divert sensitive data such as customer requests, session credentials, etc.

Weakness: CWE-444 (Inconsistent Interpretation of HTTP Requests)

## Which versions are affected by CVE-2021-33683?

It affects 2 products.


Products: Sap Internet Communication Manager, Sap Web Dispatcher.

## How do I fix CVE-2021-33683?

No fix has been published for CVE-2021-33683 yet. Limit exposure of the affected software until one is available.

## Is CVE-2021-33683 being exploited?

There is no known exploitation of CVE-2021-33683 in the wild and no public exploit code.

## Other vulnerabilities in SAP Web Dispatcher and Internet Communication Manager

- [CVE-2007-3615](https://insights.sbomify.com/CVE-2007-3615/): Denial of service in n/a (high 7.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-33683 and fix it if it is affected.

What it is: CVE-2021-33683 is a medium-severity vulnerability in SAP Web Dispatcher and Internet Communication Manager, published on 14 Jul 2021. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2021-33683 in the wild and no public exploit code.

Affected product: SAP Web Dispatcher and Internet Communication Manager. 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-2021-33683/ (Markdown: https://insights.sbomify.com/CVE-2021-33683/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-33683
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-33683
- OSV: https://osv.dev/vulnerability/CVE-2021-33683

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-33683/
Summaries are generated and may contain mistakes; the official description above is the record.