Is CVE-2021-2256 actively exploited?

No active exploitation of CVE-2021-2256 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2021-2256 be exploited remotely?

Yes. CVE-2021-2256 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2021-2256?

CVE-2021-2256 has a CVSS score of 10.0 (CRITICAL).

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CRITICAL

CVE-2021-2256

NVD-CWE-noinfoPublished: April 22, 2021· Updated: Jun 17, 2026

10.0

CVSS v3.1

Official Description

Vulnerability in the Oracle Storage Cloud Software Appliance product of Oracle Storage Gateway (component: Management Console). The supported version that is affected is Prior to 16.3.1.4.2. Easily exploitable vulnerability allows unauthenticated attacker with network access via HTTP to compromise Oracle Storage Cloud Software Appliance. While the vulnerability is in Oracle Storage Cloud Software Appliance, attacks may significantly impact additional products. Successful attacks of this vulnerability can result in takeover of Oracle Storage Cloud Software Appliance. Note: Updating the Oracle Storage Cloud Software Appliance to version 16.3.1.4.2 or later will address these vulnerabilities. Download the latest version of Oracle Storage Cloud Software Appliance from <a href=" https://www.oracle.com/downloads/cloud/oscsa-downloads.html">here. Refer to Document <a href="https://support.oracle.com/rstype=doc&id=2768897.1">2768897.1 for more details. CVSS 3.1 Base Score 10.0 (Confidentiality, Integrity and Availability impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H).

NVD Source

Technical Analysis

CVE-2021-2256 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 10.0.

The vulnerability has a "Changed" scope, meaning successful exploitation can impact components beyond the vulnerable component itself — such as the host operating system or adjacent services.