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Insecure Deserialization in Apache Commons Collection

CVE-2015-6420GHSA-6hgm-866r-3cjv

What to do

Partial vendor fix. Follow the primary source's mitigation guidance and check back for a fix.

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

  • Maven org.apache.servicemix.bundles:org.apache.servicemix.bundles.collections-generic

    Affected
    <= 4.01
    Fixed in
    no fixed version recorded

  • Maven org.apache.servicemix.bundles:org.apache.servicemix.bundles.commons-collections

    Affected
    <= 3.2.1
    Fixed in
    no fixed version recorded

  • Maven commons-collections:commons-collections

    Affected
    < 3.2.2
    Fixed in
    3.2.2

  • Maven org.apache.commons:commons-collections4

    Affected
    < 4.1
    Fixed in
    4.1

  • Maven net.sourceforge.collections:collections-generic

    Affected
    <= 4.0.1
    Fixed in
    no fixed version recorded

Sources

Severity and exploitation
Exploitation
No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.
CVSS
not scored
EPSS
  • CVE-2015-6420: 15.20% estimated exploitation activity in the next 30 days; percentile 96.76 (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.

Serialized-object interfaces in Java applications using the Apache Commons Collections (ACC) library may allow remote attackers to execute arbitrary commands via a crafted serialized Java object.

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

    Published from ghsa record GHSA-6hgm-866r-3cjv

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-2015-6420

Advisory: Insecure Deserialization in Apache Commons Collection
IDs: CVE-2015-6420, GHSA-6hgm-866r-3cjv
Record: https://patchnext.com/advisories/cve-2015-6420 (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: Unrated
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Partial vendor fix; fixed versions by package: commons-collections:commons-collections 3.2.2; org.apache.commons:commons-collections4 4.1. A vendor fix does not mean a deployment is fixed.

## Affected components
- Maven org.apache.servicemix.bundles:org.apache.servicemix.bundles.collections-generic: affected <= 4.01
- Maven org.apache.servicemix.bundles:org.apache.servicemix.bundles.commons-collections: affected <= 3.2.1
- Maven commons-collections:commons-collections: affected < 3.2.2; fixed in 3.2.2
- Maven org.apache.commons:commons-collections4: affected < 4.1; fixed in 4.1
- Maven net.sourceforge.collections:collections-generic: affected <= 4.0.1

## Suggested inspection (read-only)
- Maven org.apache.servicemix.bundles:org.apache.servicemix.bundles.collections-generic: check the installed version with your package manager.
- Maven org.apache.servicemix.bundles:org.apache.servicemix.bundles.commons-collections: check the installed version with your package manager.
- Maven commons-collections:commons-collections: check the installed version with your package manager.
- Maven org.apache.commons:commons-collections4: check the installed version with your package manager.
- Maven net.sourceforge.collections:collections-generic: check the installed version with your package manager.

## Supported action
No complete vendor fix is recorded. Follow the primary source's mitigation guidance and check this record again before closing anything.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on org.apache.servicemix.bundles:org.apache.servicemix.bundles.collections-generic, org.apache.servicemix.bundles:org.apache.servicemix.bundles.commons-collections, commons-collections:commons-collections, org.apache.commons:commons-collections4, net.sourceforge.collections:collections-generic.
- 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-6hgm-866r-3cjv (GitHub-reviewed advisory GHSA-6hgm-866r-3cjv lists affected ranges: Maven org.apache.commons:commons-collections4 >=0 =0 =0 =0 =0 <=3.2.1)

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