# CVE-2026-102084: Junos OS: SRX Series: In an ADVPN scenario a malformed message from a peer causes Remote Code Execution

> An authenticated attacker with a valid shared secret can trigger a buffer overflow in the VPN daemon to achieve remote code execution on SRX devices.

- **Severity:** Critical 9.2 (`CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:L/AU:N/R:U/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:** 14 Oct 2026
- **Updated:** 15 Oct 2026
- **Also known as:** GHSA-fwgj-cw99-g2wp

## What is CVE-2026-102084?

CVE-2026-102084 is a critical memory corruption vulnerability in Juniper Networks Junos OS, published on 14 Oct 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

An Improper Validation of Syntactic Correctness of Input vulnerability in the VPN daemon of Juniper Networks Junos OS on SRX Series allows an authenticated, network-based attacker to take complete control of the device.

If an SRX device configured for AutoDiscovery VPN (ADVPN) receives a message from a peer that contains one or more specifically malformed attributes, this will cause a buffer overflow, which can allow remote code execution and therefore allow an attacker to take complete control of the device. To be able to carry out this attack an attacker must either have acquired the shared secret to impersonate a peer or have compromised an existing one, so this attack is considerably difficult.

This issue affects Junos OS on SRX Series:

  *  All versions before 23.2R2-S7.7;
  *  from 23.4 before 23.4R2-S7;
  *  from 24.2 before 24.2R2-S4;
  *  from 24.4 before 24.4R2-S3;
  *  from 25.2 before 25.2R2;
  *  from 25.4 before 25.4R1-S3.

Weakness: CWE-1286 (Improper Validation of Syntactic Correctness of Input)

## Which versions are affected by CVE-2026-102084?


## How do I fix CVE-2026-102084?

No fix has been published for CVE-2026-102084 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-102084 being exploited?

There is no known exploitation of CVE-2026-102084 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-102084 and fix it if it is affected.

What it is: CVE-2026-102084 is a critical memory corruption vulnerability in Juniper Networks Junos OS, published on 14 Oct 2026. 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-2026-102084 in the wild and no public exploit code.

Affected product: Juniper Networks Junos OS. 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-2026-102084/ (Markdown: https://insights.sbomify.com/CVE-2026-102084/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-102084
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-102084
- OSV: https://osv.dev/vulnerability/CVE-2026-102084

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-102084/
Summaries are generated and may contain mistakes; the official description above is the record.