# CVE-2021-30006: XML external entity in n/a

> An XXE vulnerability in IntelliJ IDEA allows attackers to disclose sensitive information.

- **Severity:** High 7.5 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 11 May 2021
- **Updated:** 3 Aug 2024
- **Also known as:** GHSA-wc63-92vq-35gr

## What is CVE-2021-30006?

CVE-2021-30006 is a high-severity vulnerability in Jetbrains Intellij Idea, published on 11 May 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

In IntelliJ IDEA before 2020.3.3, XXE was possible, leading to information disclosure.

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

## Which versions are affected by CVE-2021-30006?

It affects 1 product.


Products: Jetbrains Intellij Idea.

## How do I fix CVE-2021-30006?

No fix has been published for CVE-2021-30006 yet. Limit exposure of the affected software until one is available.

## Is CVE-2021-30006 being exploited?

There is no known exploitation of CVE-2021-30006 in the wild and no public exploit code.

## Other vulnerabilities in Jetbrains Intellij Idea

- [CVE-2026-64812](https://insights.sbomify.com/CVE-2026-64812/): Missing authorization in IntelliJ IDEA (critical 10.0)
- [CVE-2026-64813](https://insights.sbomify.com/CVE-2026-64813/): Missing authorization in IntelliJ IDEA (critical 10.0)
- [CVE-2020-11690](https://insights.sbomify.com/CVE-2020-11690/): Server-side request forgery in n/a (critical 9.8)
- [CVE-2019-10104](https://insights.sbomify.com/CVE-2019-10104/): Misconfiguration in n/a (critical 9.8)
- [CVE-2019-9186](https://insights.sbomify.com/CVE-2019-9186/): Misconfiguration in n/a (critical 9.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-30006 and fix it if it is affected.

What it is: CVE-2021-30006 is a high-severity vulnerability in Jetbrains Intellij Idea, published on 11 May 2021. 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-2021-30006 in the wild and no public exploit code.

Affected product: Jetbrains Intellij Idea. 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-2021-30006/ (Markdown: https://insights.sbomify.com/CVE-2021-30006/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-30006
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-30006
- OSV: https://osv.dev/vulnerability/CVE-2021-30006

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-30006/
Summaries are generated and may contain mistakes; the official description above is the record.