Answer in brief
CVE-2015-6420 records a Critical severity (CVSS 9.8) vulnerability in CVE Program Container. The current sources do not mark it as known exploited. The current feed maps n/a/n/a (generic), commons-collections:commons-collections (maven), net.sourceforge.collections:collections-generic (maven), org.apache.commons:commons-collections4 (maven) and additional mapped packages. Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 9.8. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps n/a/n/a (generic), commons-collections:commons-collections (maven), net.sourceforge.collections:collections-generic (maven), org.apache.commons:commons-collections4 (maven) and additional mapped packages. Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| n/a/n/ageneric | n/a | Not reported |
| commons-collections:commons-collectionsmaven | >=0 <3.2.2 | 3.2.2 |
| net.sourceforge.collections:collections-genericmaven | >=0 | Not reported |
| org.apache.commons:commons-collections4maven | >=0 <4.1 | 4.1 |
| org.apache.servicemix.bundles:org.apache.servicemix.bundles.collections-genericmaven | >=0 | Not reported |
| org.apache.servicemix.bundles:org.apache.servicemix.bundles.commons-collectionsmaven | >=0 | Not reported |
Published upstream
Dec 15, 2015
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Oct 7, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 7, 2026
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.
Quoted source text, attributed separately from HOL analysis.