How severe is CVE-2023-28766?

CVE-2023-28766 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2023-28766 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (56th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2023-28766?

CVE-2023-28766 primarily affects Siemens Siprotec 5 6md85 Firmware. In total, 39 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2023-28766?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2023-28766 published?

CVE-2023-28766 was published on 2023-04-11 and last updated on 2026-06-17.

CVE-2023-28766

CVE-2023-28766 is a high-severity vulnerability in Siemens Siprotec 5 6md85 Firmware with a CVSS 3.x base score of 7.5. 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-476.

Key facts

Severity: High (CVSS 3.x base score 7.5)
EPSS exploit prediction: 1% (56th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-476
Affected product: Siemens Siprotec 5 6md85 Firmware
Published: 2023-04-11
Last modified: 2026-06-17

Description

A vulnerability has been identified in SIPROTEC 5 6MD85 (CP300) (All versions >= V7.80 < V9.40), SIPROTEC 5 6MD86 (CP300) (All versions >= V7.80 < V9.40), SIPROTEC 5 6MD89 (CP300) (All versions >= V7.80 < V9.64), SIPROTEC 5 6MU85 (CP300) (All versions >= V7.80 < V9.40), SIPROTEC 5 7KE85 (CP300) (All versions >= V7.80 < V9.40), SIPROTEC 5 7SA82 (CP100) (All versions < V8.90), SIPROTEC 5 7SA82 (CP150) (All versions < V9.40), SIPROTEC 5 7SA86 (CP300) (All versions >= V7.80 < V9.40), SIPROTEC 5 7SA87 (CP300) (All versions >= V7.80 < V9.40), SIPROTEC 5 7SD82 (CP100) (All versions < V8.90), SIPROTEC 5 7SD82 (CP150) (All versions < V9.40), SIPROTEC 5 7SD86 (CP300) (All versions >= V7.80 < V9.40), SIPROTEC 5 7SD87 (CP300) (All versions >= V7.80 < V9.40), SIPROTEC 5 7SJ81 (CP100) (All versions < V8.89), SIPROTEC 5 7SJ81 (CP150) (All versions < V9.40), SIPROTEC 5 7SJ82 (CP100) (All versions < V8.89), SIPROTEC 5 7SJ82 (CP150) (All versions < V9.40), SIPROTEC 5 7SJ85 (CP300) (All versions >= V7.80 < V9.40), SIPROTEC 5 7SJ86 (CP300) (All versions >= V7.80 < V9.40), SIPROTEC 5 7SK82 (CP100) (All versions < V8.89), SIPROTEC 5 7SK82 (CP150) (All versions < V9.40), SIPROTEC 5 7SK85 (CP300) (All versions >= V7.80 < V9.40), SIPROTEC 5 7SL82 (CP100) (All versions < V8.90), SIPROTEC 5 7SL82 (CP150) (All versions < V9.40), SIPROTEC 5 7SL86 (CP300) (All versions >= V7.80 < V9.40), SIPROTEC 5 7SL87 (CP300) (All versions >= V7.80 < V9.40), SIPROTEC 5 7SS85 (CP300) (All versions >= V7.80 < V9.40), SIPROTEC 5 7ST85 (CP300) (All versions >= V7.80 < V9.64), SIPROTEC 5 7ST86 (CP300) (All versions >= V7.80 < V9.40), SIPROTEC 5 7SX82 (CP150) (All versions < V9.40), SIPROTEC 5 7SX85 (CP300) (All versions >= V7.80 < V9.40), SIPROTEC 5 7UM85 (CP300) (All versions >= V7.80 < V9.40), SIPROTEC 5 7UT82 (CP100) (All versions < V8.90), SIPROTEC 5 7UT82 (CP150) (All versions < V9.40), SIPROTEC 5 7UT85 (CP300) (All versions >= V7.80 < V9.40), SIPROTEC 5 7UT86 (CP300) (All versions >= V7.80 < V9.40), SIPROTEC 5 7UT87 (CP300) (All versions >= V7.80 < V9.40), SIPROTEC 5 7VE85 (CP300) (All versions >= V7.80 < V9.40), SIPROTEC 5 7VK87 (CP300) (All versions >= V7.80 < V9.40), SIPROTEC 5 7VU85 (CP300) (All versions >= V7.80 < V9.40), SIPROTEC 5 Communication Module ETH-BA-2EL (Rev.1) (All versions < V9.40 installed on CP150 and CP300 devices), SIPROTEC 5 Communication Module ETH-BA-2EL (Rev.1) (All versions < V8.89 installed on CP100 devices), SIPROTEC 5 Communication Module ETH-BB-2FO (Rev. 1) (All versions < V9.40 installed on CP150 and CP300 devices), SIPROTEC 5 Communication Module ETH-BB-2FO (Rev. 1) (All versions < V8.89 installed on CP100 devices), SIPROTEC 5 Communication Module ETH-BD-2FO (All versions < V9.40), SIPROTEC 5 Compact 7SX800 (CP050) (All versions < V9.40). Affected devices lack proper validation of http request parameters of the hosted web service. An unauthenticated remote attacker could send specially crafted packets that could cause denial of service condition of the target device.

Frequently asked questions

What is CVE-2023-28766?: A vulnerability has been identified in SIPROTEC 5 6MD85 (CP300) (All versions >= V7.80 < V9.40), SIPROTEC 5 6MD86 (CP300) (All versions >= V7.80 < V9.40), SIPROTEC 5 6MD89 (CP300) (All versions >= V7.80 < V9.64), SIPROTEC 5 6MU85 (CP300) (All versions >= V7.80 < V9.40), SIPROTEC 5 7KE85 (CP300) (All versions >= V7.80 < V9.40), SIPROTEC 5 7SA82 (CP100) (All versions < V8.90), SIPROTEC 5 7SA82 (CP150) (All versions < V9.40), SIPROTEC 5 7SA86 (CP300) (All versions >= V7.80 < V9.40), SIPROTEC 5 7SA87 (CP300) (All versions >= V7.80 < V9.40), SIPROTEC 5 7SD82 (CP100) (All versions < V8.90), SIPROTEC 5 7SD82 (CP150) (All versions < V9.40), SIPROTEC 5 7SD86 (CP300) (All versions >= V7.80 < V9.40), SIPROTEC 5 7SD87 (CP300) (All versions >= V7.80 < V9.40), SIPROTEC 5 7SJ81 (CP100) (All versions < V8.89), SIPROTEC 5 7SJ81 (CP150) (All versions < V9.40), SIPROTEC 5 7SJ82 (CP100) (All versions < V8.89), SIPROTEC 5 7SJ82 (CP150) (All versions < V9.40), SIPROTEC 5 7SJ85 (CP300) (All versions >= V7.80 < V9.40), SIPROTEC 5 7SJ86 (CP300) (All versions >= V7.80 < V9.40), SIPROTEC 5 7SK82 (CP100) (All versions < V8.89), SIPROTEC 5 7SK82 (CP150) (All versions < V9.40), SIPROTEC 5 7SK85 (CP300) (All versions >= V7.80 < V9.40), SIPROTEC 5 7SL82 (CP100) (All versions < V8.90), SIPROTEC 5 7SL82 (CP150) (All versions < V9.40), SIPROTEC 5 7SL86 (CP300) (All versions >= V7.80 < V9.40), SIPROTEC 5 7SL87 (CP300) (All versions >= V7.80 < V9.40), SIPROTEC 5 7SS85 (CP300) (All versions >= V7.80 < V9.40), SIPROTEC 5 7ST85 (CP300) (All versions >= V7.80 < V9.64), SIPROTEC 5 7ST86 (CP300) (All versions >= V7.80 < V9.40), SIPROTEC 5 7SX82 (CP150) (All versions < V9.40), SIPROTEC 5 7SX85 (CP300) (All versions >= V7.80 < V9.40), SIPROTEC 5 7UM85 (CP300) (All versions >= V7.80 < V9.40), SIPROTEC 5 7UT82 (CP100) (All versions < V8.90), SIPROTEC 5 7UT82 (CP150) (All versions < V9.40), SIPROTEC 5 7UT85 (CP300) (All versions >= V7.80 < V9.40), SIPROTEC 5 7UT86 (CP300) (All versions >= V7.80 < V9.40), SIPROTEC 5 7UT87 (CP300) (All versions >= V7.80 < V9.40), SIPROTEC 5 7VE85 (CP300) (All versions >= V7.80 < V9.40), SIPROTEC 5 7VK87 (CP300) (All versions >= V7.80 < V9.40), SIPROTEC 5 7VU85 (CP300) (All versions >= V7.80 < V9.40), SIPROTEC 5 Communication Module ETH-BA-2EL (Rev.1) (All versions < V9.40 installed on CP150 and CP300 devices), SIPROTEC 5 Communication Module ETH-BA-2EL (Rev.1) (All versions < V8.89 installed on CP100 devices), SIPROTEC 5 Communication Module ETH-BB-2FO (Rev. 1) (All versions < V9.40 installed on CP150 and CP300 devices), SIPROTEC 5 Communication Module ETH-BB-2FO (Rev. 1) (All versions < V8.89 installed on CP100 devices), SIPROTEC 5 Communication Module ETH-BD-2FO (All versions < V9.40), SIPROTEC 5 Compact 7SX800 (CP050) (All versions < V9.40). Affected devices lack proper validation of http request parameters of the hosted web service. An unauthenticated remote attacker could send specially crafted packets that could cause denial of service condition of the target device.
How severe is CVE-2023-28766?: CVE-2023-28766 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2023-28766 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (56th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2023-28766?: CVE-2023-28766 primarily affects Siemens Siprotec 5 6md85 Firmware. In total, 39 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2023-28766?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2023-28766 published?: CVE-2023-28766 was published on 2023-04-11 and last updated on 2026-06-17.

References

Affected products (39)

cpe:2.3:o:siemens:siprotec_5_6md85_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:siemens:siprotec_5_6md86_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:siemens:siprotec_5_6md89_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:siemens:siprotec_5_6mu85_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:siemens:siprotec_5_7ke85_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:siemens:siprotec_5_7sa82_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:siemens:siprotec_5_7sa86_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:siemens:siprotec_5_7sa87_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:siemens:siprotec_5_7sd82_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:siemens:siprotec_5_7sd86_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:siemens:siprotec_5_7sd87_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:siemens:siprotec_5_7sj81_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:siemens:siprotec_5_7sj82_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:siemens:siprotec_5_7sj85_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:siemens:siprotec_5_7sj86_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:siemens:siprotec_5_7sk82_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:siemens:siprotec_5_7sk85_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:siemens:siprotec_5_7sl82_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:siemens:siprotec_5_7sl86_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:siemens:siprotec_5_7sl87_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:siemens:siprotec_5_7ss85_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:siemens:siprotec_5_7st85_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:siemens:siprotec_5_7sx85_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:siemens:siprotec_5_7um85_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:siemens:siprotec_5_7ut82_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:siemens:siprotec_5_7ut85_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:siemens:siprotec_5_7ut86_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:siemens:siprotec_5_7ut87_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:siemens:siprotec_5_7ve85_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:siemens:siprotec_5_7vk87_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:siemens:siprotec_5_communication_module_ethba2el_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:siemens:siprotec_5_communication_module_ethbb2fo_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:siemens:siprotec_5_communication_module_ethbd2fo_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:siemens:siprotec_5_compact_7sx800_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:siemens:siprotec_5_7sa84_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:siemens:siprotec_5_7sd84_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:siemens:siprotec_5_7st86_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:siemens:siprotec_5_7sx82_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:siemens:siprotec_5_7vu85_firmware:*:*:*:*:*:*:*:*

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