CVE-2023-28766: Siemens Siprotec 5 6md85 Firmware

High severity, CVSS 7.5. EPSS: 0.9% chance of exploitation in the next 30 days.

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.

Affected products

Siemens Siprotec 5 6md85 Firmware: any version; before 9.40 (fixed in 9.40)
Siemens Siprotec 5 6md86 Firmware: any version; before 9.40 (fixed in 9.40)
Siemens Siprotec 5 6md89 Firmware: any version
Siemens Siprotec 5 6mu85 Firmware: before 9.40 (fixed in 9.40)
Siemens Siprotec 5 7ke85 Firmware: any version; before 9.40 (fixed in 9.40)
Siemens Siprotec 5 7sa82 Firmware: any version; before 9.40 (fixed in 9.40)
Siemens Siprotec 5 7sa84 Firmware: any version
Siemens Siprotec 5 7sa86 Firmware: any version; before 9.40 (fixed in 9.40)
Siemens Siprotec 5 7sa87 Firmware: any version; before 9.40 (fixed in 9.40)
Siemens Siprotec 5 7sd82 Firmware: any version; before 9.40 (fixed in 9.40)
Siemens Siprotec 5 7sd84 Firmware: any version
Siemens Siprotec 5 7sd86 Firmware: any version; before 9.40 (fixed in 9.40)
Siemens Siprotec 5 7sd87 Firmware: any version; before 9.40 (fixed in 9.40)
Siemens Siprotec 5 7sj81 Firmware: any version; before 9.40 (fixed in 9.40)
Siemens Siprotec 5 7sj82 Firmware: any version; before 9.40 (fixed in 9.40)
Siemens Siprotec 5 7sj85 Firmware: any version; before 9.40 (fixed in 9.40)
Siemens Siprotec 5 7sj86 Firmware: any version; before 9.40 (fixed in 9.40)
Siemens Siprotec 5 7sk82 Firmware: any version; before 9.40 (fixed in 9.40)
Siemens Siprotec 5 7sk85 Firmware: any version; before 9.40 (fixed in 9.40)
Siemens Siprotec 5 7sl82 Firmware: any version; before 9.40 (fixed in 9.40)
Siemens Siprotec 5 7sl86 Firmware: any version; before 9.40 (fixed in 9.40)
Siemens Siprotec 5 7sl87 Firmware: any version; before 9.40 (fixed in 9.40)
Siemens Siprotec 5 7ss85 Firmware: any version; before 9.40 (fixed in 9.40)
Siemens Siprotec 5 7st85 Firmware: any version
Siemens Siprotec 5 7st86 Firmware: any version
and 14 more

Published 2023-04-11. Last modified 2026-06-17.