# CVE-2025-59964: Denial of service in Junos OS

> An unauthenticated attacker can crash the SRX4700 line card by sending traffic to the Routing Engine when sampling is enabled, causing a denial of service.

- **Severity:** High 8.7 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:L/AU:Y/R:A/V:C/RE:M/U:Green`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 9 Oct 2025
- **Updated:** 9 Oct 2025
- **Also known as:** GHSA-8cjx-8cpv-m8fr

## What is CVE-2025-59964?

CVE-2025-59964 is a high-severity denial of service vulnerability in Juniper Junos, published on 9 Oct 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

A Use of Uninitialized Resource vulnerability in the Packet Forwarding Engine (PFE) of Juniper Networks Junos OS on SRX4700 devices allows an unauthenticated, network-based attacker to cause a Denial of Service (DoS).

When forwarding-options sampling is enabled, receipt of any traffic destined to the Routing Engine (RE) by the PFE line card leads to an FPC crash and restart, resulting in a Denial of Service (DoS). 

Continued receipt and processing of any traffic leading to the RE by the PFE line card will create a sustained Denial of Service (DoS) condition to the PFE line card.

This issue affects Junos OS on SRX4700: 

  *  from 24.4 before 24.4R1-S3, 24.4R2

This issue affects IPv4 and IPv6.

Weakness: CWE-908 (Use of Uninitialized Resource)

## Which versions are affected by CVE-2025-59964?

It affects 1 product.


Products: Juniper Junos.

## How do I fix CVE-2025-59964?

No fix has been published for CVE-2025-59964 yet. Limit exposure of the affected software until one is available.

## Is CVE-2025-59964 being exploited?

There is no known exploitation of CVE-2025-59964 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-2025-59964 and fix it if it is affected.

What it is: CVE-2025-59964 is a high-severity denial of service vulnerability in Juniper Junos, published on 9 Oct 2025. 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-2025-59964 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-2025-59964/ (Markdown: https://insights.sbomify.com/CVE-2025-59964/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2025-59964
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2025-59964
- OSV: https://osv.dev/vulnerability/CVE-2025-59964

---
From sbomify Insights: https://insights.sbomify.com/CVE-2025-59964/
Summaries are generated and may contain mistakes; the official description above is the record.