# CVE-2016-4931: XML external entity in n/a

> Attackers can cause a denial of service in Junos Space via XML entity injection, requiring an upgrade to mitigate.

- **Severity:** Medium 6.5 (`CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 20 Mar 2017
- **Updated:** 6 Aug 2024
- **Also known as:** GHSA-g4hq-749c-p7fv

## What is CVE-2016-4931?

CVE-2016-4931 is a medium-severity vulnerability in Juniper Junos Space, published on 20 Mar 2017. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

XML entity injection in Junos Space before 15.2R2 allows attackers to cause a denial of service.

Weakness: CWE-611 (Improper Restriction of XML External Entity Reference)

## Which versions are affected by CVE-2016-4931?

It affects 1 product.


Products: Juniper Junos Space.

## How do I fix CVE-2016-4931?

No fix has been published for CVE-2016-4931 yet. Limit exposure of the affected software until one is available.

## Is CVE-2016-4931 being exploited?

There is no known exploitation of CVE-2016-4931 in the wild and no public exploit code.

## Other vulnerabilities in Juniper Junos Space

- [CVE-2014-3412](https://insights.sbomify.com/CVE-2014-3412/): Command injection in n/a (critical 10.0)
- [CVE-2014-3413](https://insights.sbomify.com/CVE-2014-3413/): Hardcoded credentials in n/a (critical 9.8)
- [CVE-2016-1265](https://insights.sbomify.com/CVE-2016-1265/): Junos Space: privilege escalation vulnerabilities in Junos Space (critical 9.8)
- [CVE-2017-10622](https://insights.sbomify.com/CVE-2017-10622/): Junos Space: Authentication bypass vulnerability (critical 9.8)
- [CVE-2016-4926](https://insights.sbomify.com/CVE-2016-4926/): Auth bypass in n/a (critical 9.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2016-4931 and fix it if it is affected.

What it is: CVE-2016-4931 is a medium-severity vulnerability in Juniper Junos Space, published on 20 Mar 2017. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2016-4931 in the wild and no public exploit code.

Affected product: Juniper Junos Space. 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-2016-4931/ (Markdown: https://insights.sbomify.com/CVE-2016-4931/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2016-4931
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2016-4931
- OSV: https://osv.dev/vulnerability/CVE-2016-4931

---
From sbomify Insights: https://insights.sbomify.com/CVE-2016-4931/
Summaries are generated and may contain mistakes; the official description above is the record.