# CVE-2023-51384: Security feature bypass in n/a

> Attackers can bypass destination constraints on PKCS#11 keys in OpenSSH ssh-agent when multiple keys are returned, potentially allowing unauthorized key usage.

- **Severity:** Medium 5.5 (`CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N`)
- **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:** 18 Dec 2023
- **Updated:** 15 Oct 2026
- **Also known as:** ALPINE-CVE-2023-51384, AZL-32205, AZL-35081, BELL-CVE-2023-51384, DEBIAN-CVE-2023-51384, GHSA-44xq-r8h3-q4q6, JLSEC-2026-69, ROOT-OS-ALPINE-318-CVE-2023-51384, UBUNTU-CVE-2023-51384

## What is CVE-2023-51384?

CVE-2023-51384 is a medium-severity vulnerability in Debian Debian Linux, published on 18 Dec 2023. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

In ssh-agent in OpenSSH before 9.6, certain destination constraints can be incompletely applied. When destination constraints are specified during addition of PKCS#11-hosted private keys, these constraints are only applied to the first key, even if a PKCS#11 token returns multiple keys.

Weakness: CWE-284 (Improper Access Control)

## Which versions are affected by CVE-2023-51384?

It affects 2 products.


Products: Debian Debian Linux, OpenSSH.

## How do I fix CVE-2023-51384?

Upgrade to a fixed version.

## Is CVE-2023-51384 being exploited?

There is no known exploitation of CVE-2023-51384 in the wild and no public exploit code.

## Other vulnerabilities in Debian Debian Linux

- [CVE-2015-3306](https://insights.sbomify.com/CVE-2015-3306/): ProFTPD Improper Access Control (critical 10.0, exploited in the wild)
- [CVE-2025-49113](https://insights.sbomify.com/CVE-2025-49113/): RoundCube Webmail Deserialization of Untrusted Data (critical 9.9, exploited in the wild)
- [CVE-2026-24061](https://insights.sbomify.com/CVE-2026-24061/): GNU InetUtils Argument Injection (critical 9.8, exploited in the wild)
- [CVE-2025-39682](https://insights.sbomify.com/CVE-2025-39682/): Linux Kernel Improper Check for Unusual or Exceptional Conditions (critical 9.8, exploited in the wild)
- [CVE-2024-9680](https://insights.sbomify.com/CVE-2024-9680/): Mozilla Firefox Use-After-Free (critical 9.8, exploited in the wild)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2023-51384 and fix it if it is affected.

What it is: CVE-2023-51384 is a medium-severity vulnerability in Debian Debian Linux, published on 18 Dec 2023. 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-2023-51384 in the wild and no public exploit code.

Affected product: Debian Debian Linux. 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-2023-51384/ (Markdown: https://insights.sbomify.com/CVE-2023-51384/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2023-51384
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2023-51384
- OSV: https://osv.dev/vulnerability/CVE-2023-51384

---
From sbomify Insights: https://insights.sbomify.com/CVE-2023-51384/
Summaries are generated and may contain mistakes; the official description above is the record.