# CVE-2016-1276: Denial of service in n/a

> Remote attackers can cause denial of service on Juniper SRX firewalls by sending traffic matching enabled Application Layer Gateway rules.

- **Severity:** Medium 5.9 (`CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 5 Aug 2016
- **Updated:** 5 Aug 2024
- **Also known as:** GHSA-8j6g-84v3-7fj6

## What is CVE-2016-1276?

CVE-2016-1276 is a medium-severity denial of service vulnerability in Juniper Junos, published on 5 Aug 2016. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

Juniper Junos OS before 12.1X46-D50, 12.1X47 before 12.1X47-D23, 12.3X48 before 12.3X48-D25, and 15.1X49 before 15.1X49-D40 on a High-End SRX-Series chassis system with one or more Application Layer Gateways (ALGs) enabled allow remote attackers to cause a denial of service (CPU consumption, fab link failure, or flip-flop failovers) via vectors related to in-transit traffic matching ALG rules.

Weakness: CWE-399

## Which versions are affected by CVE-2016-1276?

It affects 1 product.


Products: Juniper Junos.

## How do I fix CVE-2016-1276?

No fix has been published for CVE-2016-1276 yet. Limit exposure of the affected software until one is available.

## Is CVE-2016-1276 being exploited?

There is no known exploitation of CVE-2016-1276 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-2016-1276 and fix it if it is affected.

What it is: CVE-2016-1276 is a medium-severity denial of service vulnerability in Juniper Junos, published on 5 Aug 2016. 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-2016-1276 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-2016-1276/ (Markdown: https://insights.sbomify.com/CVE-2016-1276/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2016-1276
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2016-1276
- OSV: https://osv.dev/vulnerability/CVE-2016-1276

---
From sbomify Insights: https://insights.sbomify.com/CVE-2016-1276/
Summaries are generated and may contain mistakes; the official description above is the record.