# CVE-2017-16687: Information disclosure in SAP HANA extended application services

> Unauthenticated attackers can enumerate valid user accounts via error messages in SAP HANA self-service tools, exposing user existence.

- **Severity:** Medium 5.3 (`CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 12 Dec 2017
- **Updated:** 16 Sep 2024
- **Also known as:** GHSA-9pcr-j2qp-ppm8

## What is CVE-2017-16687?

CVE-2017-16687 is a medium-severity vulnerability in SAP HANA extended application services, published on 12 Dec 2017. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

The user self-service tools of SAP HANA extended application services, classic user self-service, a part of SAP HANA Database versions 1.00 and 2.00, can be misused to enumerate valid and invalid user accounts. An unauthenticated user could use the error messages to determine if a given username is valid.

Weakness: CWE-200 (Exposure of Sensitive Information to an Unauthorized Actor)

## Which versions are affected by CVE-2017-16687?

It affects 1 product.


Products: Sap Hana Database.

## How do I fix CVE-2017-16687?

No fix has been published for CVE-2017-16687 yet. Limit exposure of the affected software until one is available.

## Is CVE-2017-16687 being exploited?

There is no known exploitation of CVE-2017-16687 in the wild and no public exploit code.

## Other vulnerabilities in SAP HANA extended application services

- [CVE-2018-2424](https://insights.sbomify.com/CVE-2018-2424/): Cross-site scripting in SAP HANA Database (critical 9.8)
- [CVE-2026-0492](https://insights.sbomify.com/CVE-2026-0492/): Privilege escalation vulnerability in SAP HANA database (high 8.8)
- [CVE-2019-0350](https://insights.sbomify.com/CVE-2019-0350/): Denial of service in SAP HANA Database (high 7.5)
- [CVE-2021-21474](https://insights.sbomify.com/CVE-2021-21474/): Weak cryptography in SAP HANA Database (medium 6.5)
- [CVE-2020-26834](https://insights.sbomify.com/CVE-2020-26834/): Auth bypass in SAP HANA Database (medium 4.2)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2017-16687 and fix it if it is affected.

What it is: CVE-2017-16687 is a medium-severity vulnerability in SAP HANA extended application services, published on 12 Dec 2017. 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-2017-16687 in the wild and no public exploit code.

Affected product: SAP HANA extended application services. 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-2017-16687/ (Markdown: https://insights.sbomify.com/CVE-2017-16687/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2017-16687
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2017-16687
- OSV: https://osv.dev/vulnerability/CVE-2017-16687

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From sbomify Insights: https://insights.sbomify.com/CVE-2017-16687/
Summaries are generated and may contain mistakes; the official description above is the record.