# CVE-2015-4852: Oracle WebLogic Server Deserialization of Untrusted Data Vulnerability

Source: https://junglewise.ai/threats/cve-2015-4852-oracle-weblogic-server-deserialization-of-untrusted-data  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2021-11-03. Updated: 2026-05-10  
License: CC BY 4.0 with a link back

CVE-2015-4852 · Severity: critical · CVSS 9.8 · Exploited in the wild · Published 2021-11-03

Oracle WebLogic Server contains a deserialization vulnerability in the WLS Security component. Remote attackers can execute arbitrary commands via crafted serialized Java objects in T3 protocol traffic to TCP port 7001, leveraging the Apache Commons Collections library.

Technologies: [Oracle WebLogic Server](https://junglewise.ai/threats/technologies/weblogic-server). Vendors: [Oracle](https://junglewise.ai/threats/vendors/oracle).

## Quick answers

**Is CVE-2015-4852 exploited in the wild?** Yes. CVE-2015-4852 is known to be exploited in the wild, first recorded on 3 November 2021. Treat it as urgent.

**How severe is CVE-2015-4852?** Critical severity, with a CVSS score of 9.8, published 3 November 2021.

**Which products and versions are affected?** Oracle WebLogic Server 10.3.6.0, 12.1.2.0, 12.1.3.0, 12.2.1.0.

**Is there a fix for CVE-2015-4852?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2015-4852 attacked?** It is attacked over the network, in a network appliance.

**Am I affected by CVE-2015-4852?** Check whether you run Oracle WebLogic Server. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Affected products

- Oracle WebLogic Server 10.3.6.0, 12.1.2.0, 12.1.3.0, 12.2.1.0

## Timeline

- 2015-11-06: disclosed: Public disclosure of the vulnerability via Foxglove Security blog.
- 2021-11-03: kev added: Added to CISA Known Exploited Vulnerabilities Catalog.
- 2021-11-03: other: NVD publication date.

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