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CVE-2020-2555

Published: Jan 15, 2020Updated: Oct 27, 2025 Sources: CVE List NVD BDUCWE-502
9.8CRITICAL
NVD MITRE
EPSS Score
97.1%
Top 0.1%
CISA KEV
Active Exploitation
Since Nov 3, 2021
Exploits
3 Known
Remediation
Patch Available
Self-Check
Nuclei

Description

Vulnerability in the Oracle Coherence product of Oracle Fusion Middleware (component: Caching,CacheStore,Invocation). Supported versions that are affected are 3.7.1.0, 12.1.3.0.0, 12.2.1.3.0 and 12.2.1.4.0. Easily exploitable vulnerability allows unauthenticated attacker with network access via T3 to compromise Oracle Coherence. Successful attacks of this vulnerability can result in takeover of Oracle Coherence. CVSS 3.0 Base Score 9.8 (Confidentiality, Integrity and Availability impacts). CVSS Vector: (CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H).

In plain language

AI Act now

CVE-2020-2555 is a flaw in Oracle Coherence that lets an attacker on the network take control without a login; if your business runs Oracle Coherence, you should treat it as critical and patch it now.

Executive summary

CVE-2020-2555 is an unauthenticated, network-triggered takeover vulnerability in Oracle Coherence (Oracle Fusion Middleware caching/invocation path); it can be exploited by attackers with network access via T3, and it is listed in the CISA KEV with an official remediation deadline.

If affected, business impact
Full takeover of caching serviceData exposure from in-memory cacheCorrupt or altered business dataService outage and downtime risk

What to do now

  1. Check whether you use Oracle Coherence as part of Oracle Fusion Middleware in any environment (production, staging, and test).
  2. Verify the exact Oracle Coherence version you run; compare it against the affected versions noted for CVE-2020-2555 (3.7.1.0, 12.1.3.0.0, 12.2.1.3.0, 12.2.1.4.0).
  3. If any affected version is in use, upgrade/apply Oracle’s CPU fixes listed in the Oracle advisory links for CVE-2020-2555, following your vendor guidance.
  4. Confirm after upgrading that Oracle Coherence nodes are running the fixed update level and that the T3-facing network path is restricted as part of your exposure reduction.
Patch / advisory Some work to apply

CVSS Vector Breakdown

AV:NAC:LPR:NUI:NS:UC:HI:HA:H
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:HConfidentiality
High
I:HIntegrity
High
A:HAvailability
High
Open in CVSS calculator →

Weaknesses

CWE-502

Affected Products

Oracle Corporation
commercial·USaka oracle, Oracle Corp.
access managerOn-premSecurity Product
Security Products / identity-access-mgmt
coherenceOn-premDatabase
Databases / nosql
commerce platformOn-premWeb App
Enterprise Software
Communications Diameter Signaling RouterOn-prem
Databases / cache-message-queue
healthcare data repositoryOn-premWeb App
Enterprise Software / document-mgmt
Rapid PlanningOn-prem
Enterprise Software / itsm-monitoring
retail assortment planningOn-premWeb App
Enterprise Software / erp
Utilities FrameworkLibraryLibrary
OSS Libraries / generic-library
and 8 more affected products View all →

Exploitability

CISA Known Exploited Vulnerability
Added to KEV:Nov 3, 2021
Remediation due:May 3, 2022

Required action: Apply updates per vendor instructions.

3 exploit sources identified

Exploit details including PoC links, Metasploit modules, and scanner templates are available after registration.

View exploit details
Official Patch Available
Is your org exposed to CVE-2020-2555?We'll check your whole external perimeter for exposure — free. Check my exposure

Attack Graph

Products CVE Techniques Tactics

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MITRE ATT&CK

3 techniques
Execution
Initial Access
View detailed technique mapping

References

http://packetstormsecurity.com/files/157054/Oracle-Coherence-Fusion-Middleware-Remote-Code-Execution.html
packetstormsecurity.com
http://packetstormsecurity.com/files/157207/Oracle-WebLogic-Server-12.2.1.4.0-Remote-Code-Execution.html
packetstormsecurity.com
http://packetstormsecurity.com/files/157795/WebLogic-Server-Deserialization-Remote-Code-Execution.html
packetstormsecurity.com
and 9 more references View all →

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