# CVE-2021-33665: Cross-site scripting in SAP NetWeaver Application Server ABAP (Applications based on SAP GUI for HTML)

> An attacker can execute arbitrary scripts in the context of other users via SAP GUI for HTML, potentially leading to session hijacking or data theft.

- **Severity:** Medium 5.4 (`CVSS:3.0/AV:N/AC:L/PR:L/UI:R/S:C/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:** A user has to click or open something
- **Fix available:** No
- **Published:** 9 Jun 2021
- **Updated:** 3 Aug 2024
- **Also known as:** GHSA-v63x-mvcc-j8h6

## What is CVE-2021-33665?

CVE-2021-33665 is a medium-severity cross-site scripting vulnerability in Sap Netweaver Application Server Abap, published on 9 Jun 2021. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.

### Official description

SAP NetWeaver Application Server ABAP (Applications based on SAP GUI for HTML), versions - KRNL64NUC - 7.49, KRNL64UC - 7.49,7.53, KERNEL - 7.49,7.53,7.77,7.81,7.84, does not sufficiently encode user-controlled inputs, resulting in Cross-Site Scripting (XSS) vulnerability.

Weakness: CWE-79 (Improper Neutralization of Input During Web Page Generation)

## Which versions are affected by CVE-2021-33665?

It affects 1 product.


Products: Sap Netweaver Application Server Abap.

## How do I fix CVE-2021-33665?

No fix has been published for CVE-2021-33665 yet. Limit exposure of the affected software until one is available.

## Is CVE-2021-33665 being exploited?

There is no known exploitation of CVE-2021-33665 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-2021-33665 and fix it if it is affected.

What it is: CVE-2021-33665 is a medium-severity cross-site scripting vulnerability in Sap Netweaver Application Server Abap, published on 9 Jun 2021. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2021-33665 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-2021-33665/ (Markdown: https://insights.sbomify.com/CVE-2021-33665/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-33665
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-33665
- OSV: https://osv.dev/vulnerability/CVE-2021-33665

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From sbomify Insights: https://insights.sbomify.com/CVE-2021-33665/
Summaries are generated and may contain mistakes; the official description above is the record.