# CVE-2021-22113: Incorrect Authorization in Spring Cloud Netflix Zuul

> Attackers can bypass Sensitive Headers restrictions in Spring Cloud Netflix Zuul using specially constructed URLs if StrictHttpFirewall is disabled.

- **Severity:** Medium 5.3 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 23 Feb 2021
- **Updated:** 3 Aug 2024
- **Also known as:** GHSA-vwpg-f6gw-rjvf

## What is CVE-2021-22113?

CVE-2021-22113 is a medium-severity vulnerability in Spring Cloud Netflix Zuul, published on 23 Feb 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

Applications using the “Sensitive Headers” functionality in Spring Cloud Netflix Zuul 2.2.6.RELEASE and below may be vulnerable to bypassing the “Sensitive Headers” restriction when executing requests with specially constructed URLs. Applications that use Spring Security's StrictHttpFirewall (enabled by default for all URLs) are not affected by the vulnerability, as they reject requests that allow bypassing.

Weakness: CWE-863 (Incorrect Authorization)

## Which versions are affected by CVE-2021-22113?

2 open source packages ship an affected version, including org.springframework.cloud:spring-cloud-netflix-zuul. It affects 1 product.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `org.springframework.cloud:spring-cloud-netflix-zuul` | Maven | All versions | 2.2.7 |
| `org.springframework.cloud:spring-cloud-netflix-zuul` | Maven | All versions | 2.2.7 |

Products: Vmware Spring Cloud Netflix Zuul.

## How do I fix CVE-2021-22113?

Upgrade org.springframework.cloud:spring-cloud-netflix-zuul to 2.2.7 or later.

## Is CVE-2021-22113 being exploited?

There is no known exploitation of CVE-2021-22113 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-22113 and fix it if it is affected.

What it is: CVE-2021-22113 is a medium-severity vulnerability in Spring Cloud Netflix Zuul, published on 23 Feb 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-2021-22113 in the wild and no public exploit code.

Affected packages and fixed versions:
- org.springframework.cloud:spring-cloud-netflix-zuul (Maven): affected all versions; fixed in 2.2.7
- org.springframework.cloud:spring-cloud-netflix-zuul (Maven): affected all versions; fixed in 2.2.7

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-2021-22113/ (Markdown: https://insights.sbomify.com/CVE-2021-22113/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-22113
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-22113
- OSV: https://osv.dev/vulnerability/CVE-2021-22113

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-22113/
Summaries are generated and may contain mistakes; the official description above is the record.