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Fencer Intel
critical 9.8

CVE-2015-6420 in the critical feed json

Insecure Deserialization in Apache Commons Collection

published 10y ago modified last mo. also GHSA-6hgm-866r-3cjv , EUVD-2020-0464

cvss
9.8
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
24.2%
EPSS 24.2% chance of exploitation in 30 days, percentile 97%
public exploits
0
none known

Summary

Serialized-object interfaces in certain Cisco Collaboration and Social Media; Endpoint Clients and Client Software; Network Application, Service, and Acceleration; Network and Content Security Devices; Network Management and Provisioning; Routing and Switching - Enterprise and Service Provider; Unified Computing; Voice and Unified Communications Devices; Video, Streaming, TelePresence, and Transcoding Devices; Wireless; and Cisco Hosted Services products allow remote attackers to execute arbitrary commands via a crafted serialized Java object, related to the Apache Commons Collections (ACC) library.

Patch / fix

  • maven org.apache.commons:commons-collections4 4.1
  • maven commons-collections:commons-collections 3.2.2
  • apache commons_collections 3.2.2

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CISA SSVC

Exploitation
none
Automatable
yes
Technical impact
total
Assessed
last mo.

Exploit prediction

24.23% chance of exploitation in the next 30 days, higher than 97% of all scored CVEs (FIRST EPSS, 2026-11-09).

Exploits and checks

  • foxglovesecurity.com https://foxglovesecurity.com/2015/11/06/what-do-weblogic-websphere-jboss-jenkins-opennms-and-your-application-have-in-common-this-vulnerability/ referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CISA ADP 3.1 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD 3.1 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CNA 3.1 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD 2.0 7.5 AV:N/AC:L/Au:N/C:P/I:P/A:P

Affected packages

ecosystem package affected fixed in
maven org.apache.commons:commons-collections4
<4.1
4.1
maven commons-collections:commons-collections
<3.2.2
3.2.2
maven net.sourceforge.collections:collections-generic
<=4.0.1
no fix listed
maven org.apache.servicemix.bundles:org.apache.servicemix.bundles.collections-generic
<=4.01
no fix listed
maven org.apache.servicemix.bundles:org.apache.servicemix.bundles.commons-collections
<=3.2.1
no fix listed

Classification

Weakness
  • CWE-502 Deserialization of Untrusted Data

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.