How severe is CVE-2023-5768?

CVE-2023-5768 has a CVSS 3.x base score of 5.9, rated medium severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2023-5768 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (33rd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2023-5768?

CVE-2023-5768 primarily affects Hitachienergy Rtu520 Firmware. In total, 4 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2023-5768?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2023-5768 published?

CVE-2023-5768 was published on 2023-12-04 and last updated on 2026-06-17.

CVE-2023-5768

CVE-2023-5768 is a medium-severity vulnerability in Hitachienergy Rtu520 Firmware with a CVSS 3.x base score of 5.9. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-79.

Key facts

Severity: Medium (CVSS 3.x base score 5.9)
EPSS exploit prediction: 0% (33rd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-79
Affected product: Hitachienergy Rtu520 Firmware
Published: 2023-12-04
Last modified: 2026-06-17

Description

A vulnerability exists in the HCI IEC 60870-5-104 that affects the RTU500 series product versions listed below. Incomplete or wrong received APDU frame layout may cause blocking on link layer. Error reason was an endless blocking when reading incoming frames on link layer with wrong length information of APDU or delayed reception of data octets. Only communication link of affected HCI IEC 60870-5-104 is blocked. If attack sequence stops the communication to the previously attacked link gets normal again.

Frequently asked questions

What is CVE-2023-5768?: A vulnerability exists in the HCI IEC 60870-5-104 that affects the RTU500 series product versions listed below. Incomplete or wrong received APDU frame layout may cause blocking on link layer. Error reason was an endless blocking when reading incoming frames on link layer with wrong length information of APDU or delayed reception of data octets. Only communication link of affected HCI IEC 60870-5-104 is blocked. If attack sequence stops the communication to the previously attacked link gets normal again.
How severe is CVE-2023-5768?: CVE-2023-5768 has a CVSS 3.x base score of 5.9, rated medium severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2023-5768 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (33rd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2023-5768?: CVE-2023-5768 primarily affects Hitachienergy Rtu520 Firmware. In total, 4 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2023-5768?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2023-5768 published?: CVE-2023-5768 was published on 2023-12-04 and last updated on 2026-06-17.

References

https://publisher.hitachienergy.com/preview?DocumentId=8DBD000176&languageCode=en&Preview=true

Affected products (4)

cpe:2.3:o:hitachienergy:rtu520_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:hitachienergy:rtu530_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:hitachienergy:rtu540_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:hitachienergy:rtu560_firmware:*:*:*:*:*:*:*:*

More vulnerabilities in Hitachienergy Rtu520 Firmware

CVE-2026-1773 — High (CVSS 7.5): IEC 60870-5-104 used in RTU500: Potential Denial of Service impact on reception of invalid U-format frame. Product is…
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