What is the CVSS score of CVE-2022-2081?

CVE-2022-2081 has a CVSS 3.1 base score of 7.5 (High). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H. EPSS exploitation probability: 0.2%.

Which versions of Rtu520 Firmware are affected by CVE-2022-2081?

Organizations using the HCI Modbus TCP function included in the product face notable risk from CVE-2022-2081, a out-of-bounds write vulnerability rated CVSS 7.5.

How to fix or mitigate CVE-2022-2081?

Within 30 days: Identify all affected systems running the HCI Modbus TCP function included in the product and apply vendor patches as part of regular patch cycle. If patching is delayed, consider network segmentation to limit exposure.

Rtu520 Firmware CVE-2022-2081

HIGH

Out-of-bounds Write (CWE-787)

2024-01-04 cybersecurity@hitachienergy.com

Buffer Overflow Memory Corruption Rtu520 Firmware Rtu530 Firmware Rtu540 Firmware Rtu560 Firmware

7.5

CVSS 3.1 · NVD

Severity by source

NVD PRIMARY

7.5 HIGH

AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

Lifecycle Timeline

Analysis Generated

Mar 28, 2026 - 19:33 vuln.today

CVE Published

Jan 04, 2024 - 10:15 nvd

HIGH 7.5

DescriptionCVE.org

A vulnerability exists in the HCI Modbus TCP function included in the product versions listed above. If the HCI Modbus TCP is enabled and configured, an attacker could exploit the vulnerability by sending a specially crafted message to the RTU500 in a high rate, causing the targeted RTU500 CMU to reboot. The vulnerability is caused by a lack of flood control which eventually if exploited causes an internal stack overflow in the HCI Modbus TCP function.

AnalysisAI

A vulnerability exists in the HCI Modbus TCP function included in the product versions listed above. Rated high severity (CVSS 7.5), this vulnerability is remotely exploitable, no authentication required, low attack complexity. No vendor patch available.

Technical ContextAI

This vulnerability is classified as Out-of-bounds Write (CWE-787), which allows attackers to write data beyond allocated buffer boundaries leading to code execution or crashes. A vulnerability exists in the HCI Modbus TCP function included in the product versions listed above. If the HCI Modbus TCP is enabled and configured, an attacker could exploit the vulnerability by sending a specially crafted message to the RTU500 in a high rate, causing the targeted RTU500 CMU to reboot. The vulnerability is caused by a lack of flood control which eventually if exploited causes an internal stack overflow in the HCI Modbus TCP function. Affected products include: Hitachienergy Rtu520 Firmware, Hitachienergy Rtu530 Firmware, Hitachienergy Rtu540 Firmware, Hitachienergy Rtu560 Firmware.

RemediationAI

No vendor patch is available at time of analysis. Monitor vendor advisories for updates. Validate write boundaries, use memory-safe languages, enable compiler protections (ASLR, stack canaries).