# CVE-2021-27603: Denial of service in SAP NetWeaver AS for ABAP

> An attacker can exhaust work processes in SAP NetWeaver AS ABAP by repeatedly calling a specific function module, causing a denial of service.

- **Severity:** Medium 6.5 (`CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H`)
- **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:** 13 Apr 2021
- **Updated:** 3 Aug 2024
- **Also known as:** GHSA-7vfx-38v2-mc63

## What is CVE-2021-27603?

CVE-2021-27603 is a medium-severity denial of service vulnerability in Sap Netweaver Application Server Abap, published on 13 Apr 2021. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

An RFC enabled function module SPI_WAIT_MILLIS in SAP NetWeaver AS ABAP, versions - 731, 740, 750, allows to keep a work process busy for any length of time. An attacker could call this function module multiple times to block all work processes thereby causing Denial of Service and affecting the Availability of the SAP system.

## Which versions are affected by CVE-2021-27603?

It affects 1 product.


Products: Sap Netweaver Application Server Abap.

## How do I fix CVE-2021-27603?

No fix has been published for CVE-2021-27603 yet. Limit exposure of the affected software until one is available.

## Is CVE-2021-27603 being exploited?

There is no known exploitation of CVE-2021-27603 in the wild and no public exploit code.

## Other vulnerabilities in Sap Netweaver Application Server Abap

- [CVE-2026-0488](https://insights.sbomify.com/CVE-2026-0488/): Code Injection vulnerability in SAP CRM and SAP S/4HANA (Scripting Editor) (critical 9.9)
- [CVE-2021-40499](https://insights.sbomify.com/CVE-2021-40499/): Code injection in SAP NetWeaver Application Server for ABAP (SAP Cloud Print Manager and SAPSprint) (critical 9.8)
- [CVE-2023-27269](https://insights.sbomify.com/CVE-2023-27269/): Directory Traversal vulnerability in SAP NetWeaver AS for ABAP and ABAP Platform (critical 9.6)
- [CVE-2023-27500](https://insights.sbomify.com/CVE-2023-27500/): Directory Traversal vulnerability in SAP NetWeaver AS for ABAP and ABAP Platform (critical 9.6)
- [CVE-2023-0014](https://insights.sbomify.com/CVE-2023-0014/): Capture-replay vulnerability in SAP NetWeaver AS for ABAP and ABAP Platform (critical 9.0)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-27603 and fix it if it is affected.

What it is: CVE-2021-27603 is a medium-severity denial of service vulnerability in Sap Netweaver Application Server Abap, published on 13 Apr 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-2021-27603 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-2021-27603/ (Markdown: https://insights.sbomify.com/CVE-2021-27603/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-27603
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-27603
- OSV: https://osv.dev/vulnerability/CVE-2021-27603

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From sbomify Insights: https://insights.sbomify.com/CVE-2021-27603/
Summaries are generated and may contain mistakes; the official description above is the record.