{
    "id": "CVE-2015-6420",
    "published": "2015-12-15 05:59:07",
    "last_modified": "2026-06-17 00:30:51",
    "cvss_score": "9.8",
    "cvss_severity": "CRITICAL",
    "cvss_version": "3.1",
    "cvss_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
    "cwe": "CWE-502",
    "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.",
    "epss_score": "0.18618",
    "epss_percentile": "0.97186",
    "kev": 0,
    "kev_due": null,
    "has_exploit": 0,
    "updated_at": "2026-10-03 18:17:15",
    "priority": {
        "rank": 2,
        "label": "Patch early",
        "why": "EPSS 18.6% — above the 10% action threshold."
    },
    "products": [
        {
            "vendor": "apache",
            "product": "commons_collections"
        }
    ],
    "kev_detail": null,
    "exploits": [],
    "refs_list": [
        "http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20151209-java-deserialization",
        "http://www.oracle.com/technetwork/security-advisory/cpujul2018-4258247.html",
        "http://www.securityfocus.com/bid/78872",
        "https://h20566.www2.hpe.com/portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c05376917",
        "https://h20566.www2.hpe.com/portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c05390722",
        "https://lists.apache.org/thread.html/r352e40ca9874d1beb4ad95403792adca7eb295e6bc3bd7b65fabcc21%40%3Ccommits.samza.apache.org%3E",
        "https://www.kb.cert.org/vuls/id/581311",
        "https://www.tenable.com/security/research/tra-2017-14",
        "https://www.tenable.com/security/research/tra-2017-23",
        "http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20151209-java-deserialization",
        "http://www.oracle.com/technetwork/security-advisory/cpujul2018-4258247.html",
        "http://www.securityfocus.com/bid/78872",
        "https://foxglovesecurity.com/2015/11/06/what-do-weblogic-websphere-jboss-jenkins-opennms-and-your-application-have-in-common-this-vulnerability/",
        "https://h20566.www2.hpe.com/portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c05376917",
        "https://h20566.www2.hpe.com/portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c05390722",
        "https://lists.apache.org/thread.html/r352e40ca9874d1beb4ad95403792adca7eb295e6bc3bd7b65fabcc21%40%3Ccommits.samza.apache.org%3E",
        "https://news.apache.org/foundation/entry/apache_commons_statement_to_widespread",
        "https://www.kb.cert.org/vuls/id/576313",
        "https://www.kb.cert.org/vuls/id/581311",
        "https://www.tenable.com/security/research/tra-2017-14",
        "https://www.tenable.com/security/research/tra-2017-23"
    ]
}