# CVE-2017-2304: Information disclosure in Junos OS running on QFX3500, QFX3600, QFX5100, QFX5200, EX4300, EX4600 devices

> Attackers can read sensitive system memory or previous packet data from unpatched Juniper network switches due to missing Ethernet packet padding.

- **Severity:** High 7.5 (`CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/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:** 30 May 2017
- **Updated:** 5 Aug 2024
- **Also known as:** GHSA-2wf6-7ffx-gx7r

## What is CVE-2017-2304?

CVE-2017-2304 is a high-severity vulnerability in Juniper Junos, published on 30 May 2017. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

Juniper Networks QFX3500, QFX3600, QFX5100, QFX5200, EX4300 and EX4600 devices running Junos OS 14.1X53 prior to 14.1X53-D40, 15.1X53 prior to 15.1X53-D40, 15.1 prior to 15.1R2, do not pad Ethernet packets with zeros, and thus some packets can contain fragments of system memory or data from previous packets. This issue is also known as 'Etherleak'

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

## Which versions are affected by CVE-2017-2304?

It affects 1 product.


Products: Juniper Junos.

## How do I fix CVE-2017-2304?

No fix has been published for CVE-2017-2304 yet. Limit exposure of the affected software until one is available.

## Is CVE-2017-2304 being exploited?

There is no known exploitation of CVE-2017-2304 in the wild and no public exploit code.

## Other vulnerabilities in Juniper Junos

- [CVE-2023-36845](https://insights.sbomify.com/CVE-2023-36845/): Juniper Junos OS EX Series and SRX Series PHP External Variable Modification (critical 9.8, exploited in the wild)
- [CVE-2020-1631](https://insights.sbomify.com/CVE-2020-1631/): Juniper Junos OS Path Traversal (high 8.8, exploited in the wild)
- [CVE-2025-21590](https://insights.sbomify.com/CVE-2025-21590/): Juniper Junos OS Improper Isolation or Compartmentalization (medium 6.7, exploited in the wild)
- [CVE-2023-36851](https://insights.sbomify.com/CVE-2023-36851/): Juniper Junos OS SRX Series Missing Authentication for Critical Function (medium 5.3, exploited in the wild)
- [CVE-2023-36844](https://insights.sbomify.com/CVE-2023-36844/): Juniper Junos OS EX Series PHP External Variable Modification (medium 5.3, exploited in the wild)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2017-2304 and fix it if it is affected.

What it is: CVE-2017-2304 is a high-severity vulnerability in Juniper Junos, published on 30 May 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-2017-2304 in the wild and no public exploit code.

Affected product: Juniper Junos. 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-2017-2304/ (Markdown: https://insights.sbomify.com/CVE-2017-2304/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2017-2304
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2017-2304
- OSV: https://osv.dev/vulnerability/CVE-2017-2304

---
From sbomify Insights: https://insights.sbomify.com/CVE-2017-2304/
Summaries are generated and may contain mistakes; the official description above is the record.