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Medium, CVSS 6.5

Improper Input Validation in Spring Framework

CVE-2020-5421GHSA-rv39-3qh7-9v7w

What to do

Vendor fix available. Upgrade each affected package to the fixed version on its release line (org.springframework:spring-framework-bom 5.2.9, 5.1.18, 5.0.19, 4.3.29), redeploy, then verify what is actually installed.

This page has no inventory attached, so it cannot say whether you are affected. A vendor fix is not proof that your deployment is fixed.

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Affected packages

Sources

Severity and exploitation
Exploitation
No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.
CVSS
6.5 · CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:L/I:H/A:N
EPSS
  • CVE-2020-5421: 11.56% estimated exploitation activity in the next 30 days; percentile 96.04 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.
Source description

As published by the source; long descriptions are shortened.

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.

Dates and revisions
Published by the source
Last modified by the source
Source last checked
  1. Revision 1 · created ·

    Published from ghsa record GHSA-rv39-3qh7-9v7w

Agent brief

Preview the exact text before you copy it. Commands are read-only suggestions; review them before running anything.

# Patch Next advisory brief: CVE-2020-5421

Advisory: Improper Input Validation in Spring Framework
IDs: CVE-2020-5421, GHSA-rv39-3qh7-9v7w
Record: https://patchnext.com/advisories/cve-2020-5421 (revision 1, source checked 26 Oct 2026, 16:11 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Medium (CVSS 6.5)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: org.springframework:spring-framework-bom 5.2.9, 5.1.18, 5.0.19, 4.3.29. A vendor fix does not mean a deployment is fixed.

## Affected components
- Maven org.springframework:spring-framework-bom: affected >= 5.2.0, <= 5.2.8; >= 5.1.0, <= 5.1.17; >= 5.0.0, <= 5.0.18; < 4.3.29; fixed in 4.3.29, 5.2.9, 5.1.18, 5.0.19

## Suggested inspection (read-only)
- Maven org.springframework:spring-framework-bom: check the installed version with your package manager.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on org.springframework:spring-framework-bom.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://github.com/advisories/GHSA-rv39-3qh7-9v7w (GitHub-reviewed advisory GHSA-rv39-3qh7-9v7w lists affected ranges: Maven org.springframework:spring-framework-bom >=5.2.0 =5.1.0 =5.0.0 =0 <4.3.29)

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