CVEs / CVE-2015-6420
CVE-2015-6420: n/a n/a vulnerability
- critical 9.8 CVSS 3.1 (NVD)
- EPSS 24.2% chance of exploitation in the next 30 days, higher than 97% of CVEs (6 Nov 2026)
- Last changed at its sources
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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.
Affected and fixed versions
| Product | Affected | Fixed in |
|---|---|---|
| n/a n/a | n/a | — |
Exploitation
Not in the CISA Known Exploited Vulnerabilities catalog as of 6 Nov 2026.
Severity
| CVSS 3.1 | 9.8 criticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:HScored by NVD |
|---|---|
| Weakness | CWE-502 |
References
- CVE-2015-6420 on NVD
- 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://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://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
- 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://news.apache.org/foundation/entry/apache_commons_statement_to_widespread Vendor Advisory
- https://www.kb.cert.org/vuls/id/576313 Third Party Advisory
Sources
Exploitation status from the CISA Known Exploited Vulnerabilities catalog. EPSS scores from FIRST. Descriptions, severity and references from the National Vulnerability Database. Open-source package versions from OSV (CC-BY 4.0). Text is shown as each source states it; Stackurity does not edit it. Check the vendor's advisory before acting.
This product uses data from the NVD API but is not endorsed or certified by the NVD.