Exploited vulnerability · CISA KEV

Is CVE-2015-4852 exploited? Yes: in CISA KEV since 3 Nov 2021

Gociux · Oracle WebLogic Server · data: CISA KEV, CVE record, FIRST EPSS

Yes. CVE-2015-4852, Oracle WebLogic Server Deserialization of Untrusted Data Vulnerability, is being exploited in the wild. CISA added it to its Known Exploited Vulnerabilities catalog on 3 Nov 2021, 2177 days after it was published. It affects Oracle WebLogic Server. If you run it, CISA's required action is: Apply updates per vendor instructions.

exploitedYesCISA KEV · 3 Nov 2021

ransomwareNot knownno confirmed use

EPSStop 1%among the most likely CVEs to be exploited

severity9.8CVSS 3.1 · critical

US federal due3 May 2022BOD 22-01 deadline

What it is

Oracle WebLogic Server contains a deserialization of untrusted data vulnerability within Apache Commons, which can allow for for remote code execution.

Vendor	Oracle (46 exploited CVEs in KEV)
Product	WebLogic Server
Vulnerability	Oracle WebLogic Server Deserialization of Untrusted Data Vulnerability
Weakness	CWE-502
Published	18 Nov 2015
Added to KEV	3 Nov 2021
Reported by (CNA)	oracle

What to do

Check whether you run it. Look for WebLogic Server in your asset inventory, including appliances and cloud images. Stack check lists every exploited Oracle CVE at once.
Apply the fix. Apply updates per vendor instructions.
If you can't patch today, take the affected service off the internet or restrict who can reach it, and check its logs for signs of compromise since 18 Nov 2015.
Get told next time. Email alerts when CISA adds a CVE for Oracle.

Other exploited CVEs in WebLogic Server

CVE-2024-21182: Oracle WebLogic Server Unspecified Vulnerability (1 Jun 2026)
CVE-2020-2883: Oracle WebLogic Server Unspecified Vulnerability (7 Jan 2025)
CVE-2020-14644: Oracle WebLogic Server Remote Code Execution Vulnerability (18 Sep 2024)
CVE-2017-3506: Oracle WebLogic Server OS Command Injection Vulnerability (3 Jun 2024)
CVE-2023-21839: Oracle WebLogic Server Unspecified Vulnerability (1 May 2023)
CVE-2018-2628: Oracle WebLogic Server Unspecified Vulnerability (8 Sep 2022)

References

nvd.nist.gov/vuln/detail/CVE-2015-4852

Questions

Is CVE-2015-4852 being exploited?

Yes. CISA added CVE-2015-4852 to the Known Exploited Vulnerabilities catalog on 3 Nov 2021, which means there is reliable evidence of exploitation in the wild.

Is CVE-2015-4852 used in ransomware attacks?

CISA does not list known ransomware use for it. That can change, and exploitation alone is reason to fix it first.

How do I fix CVE-2015-4852?

Apply updates per vendor instructions. Check Oracle's advisory for the fixed versions, and if you can't patch quickly, restrict access to the affected WebLogic Server and watch it for signs of compromise.

Sources: CISA KEV (exploitation, ransomware use, required action, due date), the CVE record (publication date, CVSS, CNA), NVD and FIRST EPSS (live score). More: all KEV additions in November 2021 · Oracle scorecard · act-now radar.

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