# CVE-2021-33684: Memory corruption in SAP NetWeaver AS ABAP and ABAP Platform

> An attacker can crash a work process by sending overlong RFC requests, causing a temporary denial of service in SAP NetWeaver.

- **Severity:** Medium 5.3 (`CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 14 Jul 2021
- **Updated:** 3 Aug 2024
- **Also known as:** GHSA-69qv-phc7-2vh6

## What is CVE-2021-33684?

CVE-2021-33684 is a medium-severity memory corruption vulnerability in Sap Netweaver Application Server Abap, published on 14 Jul 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

SAP NetWeaver AS ABAP and ABAP Platform, 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 8.04, 7.21, 7.21EXT, 7.22, 7.22EXT, 7.49, 7.53, KERNEL 8.04, 7.21, 7.21EXT, 7.22, 7.22EXT, 7.49, 7.53, 7.77, 7.81, 7.84, allows an attacker to send overlong content in the RFC request type thereby crashing the corresponding work process because of memory corruption vulnerability. The work process will attempt to restart itself after the crash and hence the impact on the availability is low.

Weakness: CWE-787 (Out-of-bounds Write)

## Which versions are affected by CVE-2021-33684?

It affects 2 products.


Products: Sap Netweaver Abap, Sap Netweaver Application Server Abap.

## How do I fix CVE-2021-33684?

No fix has been published for CVE-2021-33684 yet. Limit exposure of the affected software until one is available.

## Is CVE-2021-33684 being exploited?

There is no known exploitation of CVE-2021-33684 in the wild and no public exploit code.

## Other vulnerabilities in Sap Netweaver Application Server Abap

- [CVE-2012-4341](https://insights.sbomify.com/CVE-2012-4341/): Memory corruption in n/a (critical 10.0)
- [CVE-2021-27610](https://insights.sbomify.com/CVE-2021-27610/): Auth bypass in SAP NetWeaver AS ABAP and ABAP Platform (critical 9.0)
- [CVE-2021-38178](https://insights.sbomify.com/CVE-2021-38178/): Business logic in SAP NetWeaver AS ABAP and ABAP Platform (high 8.8)
- [CVE-2022-22543](https://insights.sbomify.com/CVE-2022-22543/): Denial of service in SAP NetWeaver Application Server for ABAP (Kernel) and ABAP Platform (Kernel) (high 7.5)
- [CVE-2021-38181](https://insights.sbomify.com/CVE-2021-38181/): Denial of service in SAP NetWeaver AS ABAP and ABAP Platform (high 7.5)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-33684 and fix it if it is affected.

What it is: CVE-2021-33684 is a medium-severity memory corruption vulnerability in Sap Netweaver Application Server Abap, published on 14 Jul 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-2021-33684 in the wild and no public exploit code.

Affected product: Sap Netweaver Application Server Abap. 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-2021-33684/ (Markdown: https://insights.sbomify.com/CVE-2021-33684/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-33684
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-33684
- OSV: https://osv.dev/vulnerability/CVE-2021-33684

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From sbomify Insights: https://insights.sbomify.com/CVE-2021-33684/
Summaries are generated and may contain mistakes; the official description above is the record.