# CVE-2025-30659: Junos OS: SRX Series: A device configured for vector routing crashes when receiving malformed traffic

> An unauthenticated attacker can crash the Packet Forwarding Engine on Juniper SRX devices configured for Secure Vector Routing by sending malformed packets.

- **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/RE:M`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 9 Apr 2025
- **Updated:** 9 Apr 2025
- **Also known as:** GHSA-g6r3-vqhr-8438

## What is CVE-2025-30659?

CVE-2025-30659 is a high-severity denial of service vulnerability in Juniper Junos, published on 9 Apr 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

An Improper Handling of Length Parameter Inconsistency vulnerability in the Packet Forwarding Engine (PFE) of Juniper Networks Junos OS on SRX Series allows an unauthenticated, network-based attacker to cause a Denial-of-Service (DoS).

When a device configured for Secure Vector Routing (SVR) receives a specifically malformed packet the PFE will crash and restart.
This issue affects Junos OS on SRX Series:

  *  All 21.4 versions,
  *  22.2 versions before 22.2R3-S6,
  *  22.4 versions before 22.4R3-S6,
  *  23.2 versions before 23.2R2-S3,
  *  23.4 versions before 23.4R2-S4,
  *  24.2 versions before 24.2R2.

This issue does not affect versions before 21.4.

Weakness: CWE-130 (Improper Handling of Length Parameter Inconsistency)

## Which versions are affected by CVE-2025-30659?

It affects 1 product.


Products: Juniper Junos.

## How do I fix CVE-2025-30659?

No fix has been published for CVE-2025-30659 yet. Limit exposure of the affected software until one is available.

## Is CVE-2025-30659 being exploited?

There is no known exploitation of CVE-2025-30659 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-2025-30659 and fix it if it is affected.

What it is: CVE-2025-30659 is a high-severity denial of service vulnerability in Juniper Junos, published on 9 Apr 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-2025-30659 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-2025-30659/ (Markdown: https://insights.sbomify.com/CVE-2025-30659/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2025-30659
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2025-30659
- OSV: https://osv.dev/vulnerability/CVE-2025-30659

---
From sbomify Insights: https://insights.sbomify.com/CVE-2025-30659/
Summaries are generated and may contain mistakes; the official description above is the record.