CVE-2018-2628
WebLogic T3 Deserialization RCE: stopped at runtime
Waratek RASP’s secure runtime rules stop this class of attack out of the box - no application change, no vendor patch, no downtime.
Published April 19, 2018 · Updated June 30, 2026
The vulnerability
Remote code execution via T3 protocol deserialization
An unauthenticated attacker with network access to the T3 protocol can send a crafted serialized object to Oracle WebLogic Server, triggering unsafe deserialization that leads to full remote code execution and takeover of the server.
Running an affected version? We can help.
Waratek RASP shields the vulnerable code in production - the exploit is blocked at runtime with no library upgrade, no redeploy, and no downtime. We can have you covered fast.
How Waratek RASP stops it
Blocked at runtime by Waratek RASP
Waratek RASP applies a secure runtime rule that covers this whole class of attack out of the box - the exploit is stopped inside the JVM before it ever reaches a dangerous sink.
Runtime, not perimeter
Waratek RASP acts inside the JVM at the exact call that turns input into code, so obfuscated and encoded payloads are caught where a WAF misses them.
No code changes
Protection is applied as a rule at runtime. No source edits, no recompilation, no library upgrade, and no application restart required.
Zero false positives
Rules target the specific unsafe behaviour of the exploit, so legitimate traffic keeps flowing while the attack is blocked and logged.
| Mod | Rules | Enable |
|---|---|---|
| WebLogic T3 Deserialization RCE protectionCVE-2018-2628 · Unsafe deserialization | 1 | |
| SQL Injection protectionQuery manipulation | 4 | |
| Path Traversal protectionUnsafe file access | 3 |
Flip one toggle in the Waratek Portal. The protection deploys to every attached application, with no restart.
Common questions
WebLogic T3 Deserialization RCE FAQ
Is WebLogic T3 Deserialization RCE (CVE-2018-2628) exploitable?
CVE-2018-2628 carries a CVSS 9.8/10 (CRITICAL) rating and affects Oracle WebLogic Server 10.3.6.0, 12.1.3.0, 12.2.1.2, and 12.2.1.3. An unauthenticated attacker with network access to the T3 protocol can send a crafted serialized object to Oracle WebLogic Server, triggering unsafe deserialization that leads to full remote code execution and takeover of the server. It is listed in CISA's Known Exploited Vulnerabilities catalog.
How does Waratek mitigate WebLogic T3 Deserialization RCE (CVE-2018-2628)?
Waratek RASP blocks exploitation of WebLogic T3 Deserialization RCE (CVE-2018-2628) inside the JVM at runtime, with no application code changes, no vendor patch and no restart.
How quickly was WebLogic T3 Deserialization RCE (CVE-2018-2628) exploited after disclosure?
Exploit code for CVE-2018-2628 was already circulating publicly on April 18, 2018, before the vulnerability was even formally published in the NVD. Attackers had a head start before most defenders had a CVE record to react to.
Protect your apps in production
Get protected against WebLogic T3 Deserialization RCE - without code changes or redeploying
Book a call and we’ll show you how Waratek RASP shields your running applications against CVE-2018-2628 and attacks like it, and get you covered in production.