CVE-2020-2555 Oracle Multiple Products Remote Code Execution

Exploited in the wild Critical 9.8 Published 15 Jan 2020 Updated 21 Oct 2025

Unauthenticated attackers can achieve full system takeover via network access due to unsafe deserialization in Oracle Coherence.

Exploited in the wild: Since 3 Nov 2021
Login needed: Not needed
Attackable: Over the internet
Victim action needed: Not needed
Fix: None listed

What is CVE-2020-2555?

CVE-2020-2555 is a critical unsafe deserialization vulnerability in Oracle Access Manager, published on 15 Jan 2020. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official 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).

Weakness: CWE-502

Which versions are affected by CVE-2020-2555?

It affects 9 products.

Products include Oracle Access Manager, Oracle Coherence, Oracle Commerce Platform, Oracle Communications Diameter Signaling Router, Oracle Healthcare Data Repository, Oracle Rapid Planning and 3 more.

How do I fix CVE-2020-2555?

No fix has been published for CVE-2020-2555 yet. Limit exposure of the affected software until one is available. US federal agencies must fix it by 3 May 2022.

Upgrade, and only deserialise data from trusted sources or with an allow-list of types. More about Unsafe deserialization.

Is CVE-2020-2555 being exploited?

Yes. Attackers have exploited CVE-2020-2555 in the wild since at least 3 Nov 2021.

Public exploit code: 1 Metasploit module, 2 Exploit-DB entries and 5 proofs of concept on GitHub.

All Oracle Access Manager vulnerabilities

Sources

Also known as GHSA-gm93-pfh3-mrf3.