# CVE-2020-5421: RFD Protection Bypass via jsessionid

> Attackers can bypass Reflected File Download protections in Spring Framework by manipulating the jsessionid path parameter.

- **Severity:** High 8.7 (`CVSS:3.0/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** A user has to click or open something
- **Fix available:** Yes
- **Published:** 19 Sep 2020
- **Updated:** 8 Oct 2026
- **Also known as:** CLSA-2026-1792601519, CLSA-2026-1792604310, CLSA-2026-1792604538, DEBIAN-CVE-2020-5421, GHSA-rv39-3qh7-9v7w, UBUNTU-CVE-2020-5421

## What is CVE-2020-5421?

CVE-2020-5421 is a high-severity vulnerability in Netapp Oncommand Insight, published on 19 Sep 2020. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.

### Official description

In Spring Framework versions 5.2.0 - 5.2.8, 5.1.0 - 5.1.17, 5.0.0 - 5.0.18, 4.3.0 - 4.3.28, and older unsupported versions, the protections against RFD attacks from CVE-2015-5211 may be bypassed depending on the browser used through the use of a jsessionid path parameter.

## Which versions are affected by CVE-2020-5421?

8 open source packages ship an affected version, including org.springframework:spring-framework-bom. It affects 38 products.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `org.springframework:spring-framework-bom` | Maven | All versions | 4.3.29 |
| `org.springframework:spring-framework-bom` | Maven | All versions | 4.3.29 |
| `org.springframework:spring-framework-bom` | Maven | From 5.0.0 | 5.0.19 |
| `org.springframework:spring-framework-bom` | Maven | From 5.0.0 | 5.0.19 |
| `org.springframework:spring-framework-bom` | Maven | From 5.1.0 | 5.1.18 |
| `org.springframework:spring-framework-bom` | Maven | From 5.1.0 | 5.1.18 |
| `org.springframework:spring-framework-bom` | Maven | From 5.2.0 | 5.2.9 |
| `org.springframework:spring-framework-bom` | Maven | From 5.2.0 | 5.2.9 |

Products: Netapp Oncommand Insight, Netapp Snap Creator Framework, Netapp Snapcenter, Oracle Commerce Guided Search, Oracle Communications Brm, Oracle Communications Design Studio, Oracle Communications Session Report Manager, Oracle Communications Unified Inventory Management, Oracle Endeca Information Discovery Integrator, Oracle Enterprise Data Quality, Oracle Financial Services Analytical Applications Infrastructure, Oracle Flexcube Private Banking, Oracle Fusion Middleware, Oracle Goldengate Application Adapters, Oracle Healthcare Master Person Index, Oracle Hyperion Infrastructure Technology, Oracle Insurance Policy Administration, Oracle Insurance Rules Palette, Oracle Mysql Enterprise Monitor, Oracle Primavera Gateway and 18 more.

## How do I fix CVE-2020-5421?

Upgrade org.springframework:spring-framework-bom to a fixed version for your release line: 4.3.29, 5.0.19, 5.1.18 or 5.2.9.

## Is CVE-2020-5421 being exploited?

There is no known exploitation of CVE-2020-5421 in the wild and no public exploit code.

Public exploit code:

- Spring 安全漏洞 CVE-2020-5421复现  (github_poc): https://github.com/pandaMingx/CVE-2020-5421

## Other vulnerabilities in Netapp Oncommand Insight

- [CVE-2017-5600](https://insights.sbomify.com/CVE-2017-5600/): Hardcoded credentials in n/a (critical 9.8)
- [CVE-2018-1258](https://insights.sbomify.com/CVE-2018-1258/): Spring Framework when used in combination with any versions of Spring Security contains an authorization bypass (high 8.8)
- [CVE-2022-38733](https://insights.sbomify.com/CVE-2022-38733/): Auth bypass in OnCommand Insight (high 8.6)
- [CVE-2023-22102](https://insights.sbomify.com/CVE-2023-22102/): MySQL Connectors takeover vulnerability (high 8.3)
- [CVE-2021-35583](https://insights.sbomify.com/CVE-2021-35583/): Denial of service in MySQL Server (high 7.5)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2020-5421 and fix it if it is affected.

What it is: CVE-2020-5421 is a high-severity vulnerability in Netapp Oncommand Insight, published on 19 Sep 2020. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2020-5421 in the wild and no public exploit code.

Affected packages and fixed versions:
- org.springframework:spring-framework-bom (Maven): affected all versions; fixed in 4.3.29
- org.springframework:spring-framework-bom (Maven): affected all versions; fixed in 4.3.29
- org.springframework:spring-framework-bom (Maven): affected from 5.0.0; fixed in 5.0.19
- org.springframework:spring-framework-bom (Maven): affected from 5.0.0; fixed in 5.0.19
- org.springframework:spring-framework-bom (Maven): affected from 5.1.0; fixed in 5.1.18
- org.springframework:spring-framework-bom (Maven): affected from 5.1.0; fixed in 5.1.18
- org.springframework:spring-framework-bom (Maven): affected from 5.2.0; fixed in 5.2.9
- org.springframework:spring-framework-bom (Maven): affected from 5.2.0; fixed in 5.2.9

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-2020-5421/ (Markdown: https://insights.sbomify.com/CVE-2020-5421/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2020-5421
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2020-5421
- OSV: https://osv.dev/vulnerability/CVE-2020-5421

---
From sbomify Insights: https://insights.sbomify.com/CVE-2020-5421/
Summaries are generated and may contain mistakes; the official description above is the record.