# CVE-2019-16905: Integer overflow in n/a

> An integer overflow in experimental XMSS key parsing allows local code execution, affecting OpenSSH installations with this non-default feature enabled.

- **Severity:** High 7.8 (`CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 9 Oct 2019
- **Updated:** 14 Oct 2026
- **Also known as:** DEBIAN-CVE-2019-16905, GHSA-qw5m-v83j-4g26

## What is CVE-2019-16905?

CVE-2019-16905 is a high-severity vulnerability in Netapp Cloud Backup, published on 9 Oct 2019. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

OpenSSH 7.7 through 7.9 and 8.x before 8.1, when compiled with an experimental key type, has a pre-authentication integer overflow if a client or server is configured to use a crafted XMSS key. This leads to memory corruption and local code execution because of an error in the XMSS key parsing algorithm. NOTE: the XMSS implementation is considered experimental in all released OpenSSH versions, and there is no supported way to enable it when building portable OpenSSH.

Weakness: CWE-190 (Integer Overflow or Wraparound)

## Which versions are affected by CVE-2019-16905?

It affects 5 products.


Products: Netapp Cloud Backup, Netapp Steelstore Cloud Integrated Storage, OpenSSH, Siemens Scalance X204rna Ecc Firmware, Siemens Scalance X204rna Firmware.

## How do I fix CVE-2019-16905?

Upgrade to a fixed version.

## Is CVE-2019-16905 being exploited?

There is no known exploitation of CVE-2019-16905 in the wild and no public exploit code.

## Other vulnerabilities in Netapp Cloud Backup

- [CVE-2019-19646](https://insights.sbomify.com/CVE-2019-19646/): Null dereference in n/a (critical 9.8)
- [CVE-2019-19317](https://insights.sbomify.com/CVE-2019-19317/): Denial of service in n/a (critical 9.8)
- [CVE-2020-25692](https://insights.sbomify.com/CVE-2020-25692/): Null dereference in openldap (high 7.5)
- [CVE-2019-19645](https://insights.sbomify.com/CVE-2019-19645/): Denial of service in n/a (medium 5.5)
- [CVE-2018-15919](https://insights.sbomify.com/CVE-2018-15919/): Information disclosure in n/a (medium 5.3)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2019-16905 and fix it if it is affected.

What it is: CVE-2019-16905 is a high-severity vulnerability in Netapp Cloud Backup, published on 9 Oct 2019. It can only be exploited from the same machine or local network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2019-16905 in the wild and no public exploit code.

Affected product: Netapp Cloud Backup. 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-2019-16905/ (Markdown: https://insights.sbomify.com/CVE-2019-16905/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2019-16905
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2019-16905
- OSV: https://osv.dev/vulnerability/CVE-2019-16905

---
From sbomify Insights: https://insights.sbomify.com/CVE-2019-16905/
Summaries are generated and may contain mistakes; the official description above is the record.