CVE-2023-28766

Severity: high (CVSS 7.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.9% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2023-04-11 · updated 2026-06-17
Weakness: CWE-476

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.

Affected products

Siemens Siprotec 5 6Md85 Firmware: before 9.40 — fixed in 9.40
Siemens Siprotec 5 6Md86 Firmware: before 9.40 — fixed in 9.40
Siemens Siprotec 5 6Md89 Firmware: all versions
Siemens Siprotec 5 6Mu85 Firmware: before 9.40 — fixed in 9.40
Siemens Siprotec 5 7Ke85 Firmware: before 9.40 — fixed in 9.40
Siemens Siprotec 5 7Sa82 Firmware: before 9.40 — fixed in 9.40
Siemens Siprotec 5 7Sa84 Firmware: all versions
Siemens Siprotec 5 7Sa86 Firmware: before 9.40 — fixed in 9.40
Siemens Siprotec 5 7Sa87 Firmware: before 9.40 — fixed in 9.40
Siemens Siprotec 5 7Sd82 Firmware: before 9.40 — fixed in 9.40
Siemens Siprotec 5 7Sd84 Firmware: all versions
Siemens Siprotec 5 7Sd86 Firmware: before 9.40 — fixed in 9.40
Siemens Siprotec 5 7Sd87 Firmware: before 9.40 — fixed in 9.40
Siemens Siprotec 5 7Sj81 Firmware: before 9.40 — fixed in 9.40
Siemens Siprotec 5 7Sj82 Firmware: before 9.40 — fixed in 9.40
Siemens Siprotec 5 7Sj85 Firmware: before 9.40 — fixed in 9.40
Siemens Siprotec 5 7Sj86 Firmware: before 9.40 — fixed in 9.40
Siemens Siprotec 5 7Sk82 Firmware: before 9.40 — fixed in 9.40
Siemens Siprotec 5 7Sk85 Firmware: before 9.40 — fixed in 9.40
Siemens Siprotec 5 7Sl82 Firmware: before 9.40 — fixed in 9.40
Siemens Siprotec 5 7Sl86 Firmware: before 9.40 — fixed in 9.40
Siemens Siprotec 5 7Sl87 Firmware: before 9.40 — fixed in 9.40
Siemens Siprotec 5 7Ss85 Firmware: before 9.40 — fixed in 9.40
Siemens Siprotec 5 7St85 Firmware: all versions
Siemens Siprotec 5 7St86 Firmware: all versions
Siemens Siprotec 5 7Sx82 Firmware: before 9.40 — fixed in 9.40
Siemens Siprotec 5 7Sx85 Firmware: before 9.40 — fixed in 9.40
Siemens Siprotec 5 7Um85 Firmware: before 9.40 — fixed in 9.40
Siemens Siprotec 5 7Ut82 Firmware: before 9.40 — fixed in 9.40
Siemens Siprotec 5 7Ut85 Firmware: before 9.40 — fixed in 9.40

How to fix

Upgrade to a fixed version: Siemens Siprotec 5 6Md85 Firmware 9.40; Siemens Siprotec 5 6Md86 Firmware 9.40; Siemens Siprotec 5 6Mu85 Firmware 9.40; Siemens Siprotec 5 7Ke85 Firmware 9.40; Siemens Siprotec 5 7Sa82 Firmware 9.40; Siemens Siprotec 5 7Sa86 Firmware 9.40; Siemens Siprotec 5 7Sa87 Firmware 9.40; Siemens Siprotec 5 7Sd82 Firmware 9.40; Siemens Siprotec 5 7Sd86 Firmware 9.40; Siemens Siprotec 5 7Sd87 Firmware 9.40; Siemens Siprotec 5 7Sj81 Firmware 9.40; Siemens Siprotec 5 7Sj82 Firmware 9.40. Check the vendor advisory for mitigations.

References

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