Skip to main content
Live Webinar with SANS (June 25)— Agentic CTI Automation for Fun & ProfitRegister Free
Mallory
Back to vulnerabilities
Critical

Unauthenticated RCE in Oracle WebLogic Server via T3/IIOP

IdentifiersCVE-2025-21535CWE-306· Missing Authentication for…

CVE-2025-21535 is a critical vulnerability in the Core component of Oracle WebLogic Server affecting supported versions 12.2.1.4.0 and 14.1.1.0.0. According to the provided content, the flaw is easily exploitable by an unauthenticated attacker with network access over the T3 or IIOP protocols and can lead to compromise of the WebLogic Server. The available material characterizes it as a missing authentication issue and describes the outcome as remote code execution and server takeover. Specific vulnerable classes, methods, or packet structures are not provided in the supplied content.

Share:
For your environment

Are you exposed to this one?

Mallory correlates every CVE against your assets, your vendors, and active adversary campaigns. Know which vulnerabilities matter for you, not just which ones are loud.

Start free trial
ANALYST BRIEF

Impact, mitigation & remediation

What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.

Impact

What an attacker gets, and what they’ve been doing with it.

Successful exploitation can result in full compromise or takeover of the targeted Oracle WebLogic Server instance. The provided CVSS 3.1 vector (AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H) indicates high impact to confidentiality, integrity, and availability, consistent with unauthenticated remote code execution or equivalent complete server compromise.

Mitigation

If you can’t patch tonight, do this now.

If immediate patching is not possible, restrict or disable exposure of the T3 and IIOP services to untrusted networks, enforce network segmentation so only required administrative or application peers can reach WebLogic over those protocols, and monitor for unexpected inbound connections or exploitation attempts targeting T3/IIOP. Because the flaw is unauthenticated and low complexity, internet exposure or broad internal reachability materially increases risk.

Remediation

Patch, then assume compromise.

Apply Oracle’s security update for CVE-2025-21535 from the January 2025 Critical Patch Update for Oracle Fusion Middleware / Oracle WebLogic Server. Organizations running affected versions 12.2.1.4.0 or 14.1.1.0.0 should prioritize patching due to the vulnerability’s unauthenticated network-reachable nature and critical severity.
PUBLIC EXPLOITS

Exploits

No public exploits tracked yet. Mallory keeps watching.

VALID 0 / 0 TOTALView more in app

No public exploit code observed for this vulnerability.

EXPOSURE SURFACE

Affected products & vendors

Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.

VendorProductType
OracleWeblogic Serverapplication

Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.

ACTIVITY FEED

Recent activity

3 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.

3 SOURCESView more in app
What this page doesn’t show

The version that knows your environment.

This page is what’s public. Mallory adds the parts that aren’t: which of your assets are affected, which adversaries are exploiting it right now, which detections to deploy, and what to do tonight.
Start free trial
Exposure mapping

Query your assets running an affected version, and investigate the blast radius.

Threat actor evidence1

Every observed campaign linking this CVE to a named adversary.

Associated malware

Malware families riding this exploit, with evidence and IOCs.

Detection signatures

YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.

Vendor-by-vendor mapping

Cross-references every affected SKU, including bundled OEM variants.

Social activity

Community discussion across Reddit, Mastodon, and other social sources.

EXTERNAL REFERENCES
MITRE CVE
cve.org · CVE-2025-21535
NVD
nvd.nist.gov/vuln/detail/CVE-2025-21535
MITRE CWE · CWE-306
Missing Authentication for Critical Function
Vendor Advisory
oracle.com/security-alerts/cpujan2025.html