# CVE-2020-6304: Denial of service in SAP NetWeaver Internet Communication Manager (KERNEL)

> An attacker can cause a denial of service in SAP NetWeaver Internet Communication Manager by exploiting improper input validation.

- **Severity:** Medium 5.9 (`CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/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:** 14 Jan 2020
- **Updated:** 4 Aug 2024
- **Also known as:** GHSA-86r6-3wmr-wv39

## What is CVE-2020-6304?

CVE-2020-6304 is a medium-severity denial of service vulnerability in SAP NetWeaver Internet Communication Manager (KERNEL), published on 14 Jan 2020. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

Improper input validation in SAP NetWeaver Internet Communication Manager (update provided in KRNL32NUC & KRNL32UC 7.21, 7.21EXT, 7.22, 7.22EXT KRNL64NUC & KRNL64UC 7.21, 7.21EXT, 7.22, 7.22EXT, 7.49 KERNEL 7.21, 7.49, 7.53) allows an attacker to prevent users from accessing its services through a denial of service.

Weakness: CWE-20 (Improper Input Validation)

## Which versions are affected by CVE-2020-6304?

It affects 5 products.


Products: Sap Netweaver Internet Communication Manager \(Kernel\), Sap Netweaver Internet Communication Manager \(Krnl32nuc\), Sap Netweaver Internet Communication Manager \(Krnl32uc\), Sap Netweaver Internet Communication Manager \(Krnl64nuc\), Sap Netweaver Internet Communication Manager \(Krnl64uc\).

## How do I fix CVE-2020-6304?

No fix has been published for CVE-2020-6304 yet. Limit exposure of the affected software until one is available.

## Is CVE-2020-6304 being exploited?

There is no known exploitation of CVE-2020-6304 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2020-6304 and fix it if it is affected.

What it is: CVE-2020-6304 is a medium-severity denial of service vulnerability in SAP NetWeaver Internet Communication Manager (KERNEL), published on 14 Jan 2020. 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-2020-6304 in the wild and no public exploit code.

Affected product: SAP NetWeaver Internet Communication Manager (KERNEL). 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-2020-6304/ (Markdown: https://insights.sbomify.com/CVE-2020-6304/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2020-6304
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2020-6304
- OSV: https://osv.dev/vulnerability/CVE-2020-6304

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From sbomify Insights: https://insights.sbomify.com/CVE-2020-6304/
Summaries are generated and may contain mistakes; the official description above is the record.