Reference page — cumulative record through Thursday, October 8, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.

CVE-2015-6420

CVE-2015-6420CRITICAL

n/a n/a — Serialized-object interfaces in certain Cisco Collaboration and Social Media; Endpoint Clients and Client Software; Network Application, …

  AV  AC  PR  UI  S  C  I  A   CVSS    EPSS   %ile   KEV
   N   L   N   N  U  H  H  H    9.8   .1876   97.2     —

AFFECTED
  Product  Versions  Fixed
  n/a      n/a –     —

TIMELINE
  Aug 17  Reserved by cisco
  Dec 15  Published (CNA: cisco)
  Oct 7   EXPLOIT PUBLISHED — CVE-2015-6420. Public exploit reference added.

CWE-502 · CNA: cisco · CVSS v3.1 · 12 references · NVD status: Modified

Description

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.

Lifecycle

Complete event history — 3 events, chronological
Date	Event	Detail
August 17, 2015	Reserved	Reserved by cisco
December 15, 2015	Published	Published (CNA: cisco)
October 7, 2026	EXPLOIT PUBLISHED	EXPLOIT PUBLISHED — CVE-2015-6420. Public exploit reference added.

Affected

Affected products and packages — 1 row
Vendor	Product / Package	Ecosystem	Version introduced	Fixed
n/a	n/a	—	n/a	—

Weaknesses

CWE-502

References (12)

http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20151209-java-deserialization [Third Party Advisory]
http://www.oracle.com/technetwork/security-advisory/cpujul2018-4258247.html [Third Party Advisory]
http://www.securityfocus.com/bid/78872 [Third Party Advisory, VDB Entry]
https://foxglovesecurity.com/2015/11/06/what-do-weblogic-websphere-jboss-jenkins-opennms-and-your-application-have-in-common-this-vulnerability/ [Exploit, Third Party Advisory]
https://h20566.www2.hpe.com/portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c05376917 [Third Party Advisory]
https://h20566.www2.hpe.com/portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c05390722 [Third Party Advisory]
https://lists.apache.org/thread.html/r352e40ca9874d1beb4ad95403792adca7eb295e6bc3bd7b65fabcc21%40%3Ccommits.samza.apache.org%3E [Vendor Advisory]
https://news.apache.org/foundation/entry/apache_commons_statement_to_widespread [Vendor Advisory]
https://www.kb.cert.org/vuls/id/576313 [Third Party Advisory]
https://www.kb.cert.org/vuls/id/581311 [Third Party Advisory]
https://www.tenable.com/security/research/tra-2017-14 [Third Party Advisory]
https://www.tenable.com/security/research/tra-2017-23 [Third Party Advisory]

Authoritative record: CVE-2015-6420 at cve.org

Weaknesses: CWE-502

About this page

This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2015-6420 from the CVE Program record, NVD enrichment, the CISA KEV catalog, EPSS, and OSV advisories. The box score's numbers (CVSS, EPSS, KEV status) are current as of Thursday, October 8, 2026 UTC and are re-derived as the archive grows; only dated daily editions are immutable pages of record. The authoritative source for this identifier is cve.org.