---
id: "CVE-2015-4852"
kind: "vulnerability"
aliases: ["CVE-2015-4852"]
title: "Oracle WebLogic Server: Oracle WebLogic Server Deserialization of Untrusted Data Vulnerability"
severity: "critical"
cvss: 9.8
epss: 0.94991
exploited: true
status: "open"
category: "runtime"
products: [{"name": "Oracle WebLogic Server", "fixed": [], "affected": "", "ecosystem": "vendor"}]
ecosystems: ["vendor"]
tags: ["exploited", "java", "oracle-weblogic-server", "runtime", "weblogic"]
not_affected_if: ["not-running-weblogic"]
published_at: "2015-11-18T15:59:00+00:00"
first_seen_at: "2026-10-23T19:11:53+00:00"
updated_at: "2026-10-23T21:57:34+00:00"
sources: [{"source": "kev", "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?search_api_fulltext=CVE-2015-4852", "first_seen_at": "2026-10-23T19:11:53+00:00"}, {"source": "epss", "url": "https://api.first.org/data/v1/epss?cve=CVE-2015-4852", "first_seen_at": "2026-10-23T19:13:44+00:00"}, {"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2015-4852", "first_seen_at": "2026-10-23T21:57:34+00:00"}]
---

# Oracle WebLogic Server: Oracle WebLogic Server Deserialization of Untrusted Data Vulnerability

Oracle WebLogic Server has a deserialization flaw in its bundled Apache Commons code that lets a remote attacker send crafted serialized data. An attacker can run code on the server.

_Summary, check and fix written by a model from the sources; labelled as such._

## Affected

- vendor:Oracle WebLogic Server affected ? fixed ?

## Fix

Apply Oracle's updates for WebLogic Server per vendor instructions; CISA requires updates per vendor instructions. Specific fixed versions: unknown

## Timeline

- 2026-10-23T19:11:53+00:00 kev https://www.cisa.gov/known-exploited-vulnerabilities-catalog?search_api_fulltext=CVE-2015-4852
- 2026-10-23T19:13:44+00:00 epss https://api.first.org/data/v1/epss?cve=CVE-2015-4852
- 2026-10-23T21:57:34+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2015-4852

## From the sources

The WLS Security component in Oracle WebLogic Server 10.3.6.0, 12.1.2.0, 12.1.3.0, and 12.2.1.0 allows remote attackers to execute arbitrary commands via a crafted serialized Java object in T3 protocol traffic to TCP port 7001, related to oracle_common/modules/com.bea.core.apache.commons.collections.jar. NOTE: the scope of this CVE is limited to the WebLogic Server product.

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_Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai_