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CVE-2021-27385

HIGH

7.5

CVSS Score

Published: May 12, 2021 at 01:18 PM UTC

Updated: June 17, 2026 at 03:44 AM UTC

37 products affected across 1 vendorSIMATIC WinCC Runtime AdvancedSIMATIC HMI Ktp Mobile Panels KTP700F FirmwareSIMATIC HMI Ktp Mobile Panels KTP400F Firmware

Using SIMATIC HMI Comfort Outdoor Panels V15 7\" & 15\" (incl. SIPLUS variants) by Siemens?

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Severity

HIGH7.5

Exploit prediction

EPSS 3%

SSVC

No known exploit

Description

A vulnerability has been identified in SIMATIC HMI Comfort Outdoor Panels V15 7\" & 15\" (incl. SIPLUS variants) (All versions < V15.1 Update 6), SIMATIC HMI Comfort Outdoor Panels V16 7\" & 15\" (incl. SIPLUS variants) (All versions < V16 Update 4), SIMATIC HMI Comfort Panels V15 4\" - 22\" (incl. SIPLUS variants) (All versions < V15.1 Update 6), SIMATIC HMI Comfort Panels V16 4\" - 22\" (incl. SIPLUS variants) (All versions < V16 Update 4), SIMATIC HMI KTP Mobile Panels V15 KTP400F, KTP700, KTP700F, KTP900 and KTP900F (All versions < V15.1 Update 6), SIMATIC HMI KTP Mobile Panels V16 KTP400F, KTP700, KTP700F, KTP900 and KTP900F (All versions < V16 Update 4), SIMATIC WinCC Runtime Advanced V15 (All versions < V15.1 Update 6), SIMATIC WinCC Runtime Advanced V16 (All versions < V16 Update 4), SINAMICS GH150 (All versions), SINAMICS GL150 (with option X30) (All versions), SINAMICS GM150 (with option X30) (All versions), SINAMICS SH150 (All versions), SINAMICS SL150 (All versions), SINAMICS SM120 (All versions), SINAMICS SM150 (All versions), SINAMICS SM150i (All versions). A remote attacker could send specially crafted packets to SmartVNC device layout handler on client side, which could influence the amount of resources consumed and result in a Denial-of-Service (infinite loop) condition.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

SIMATIC HMI Comfort Outdoor Panels 15 " Firmware · Siemens

95%

v < 15.1v < 1615.1 15.1 update1 15.1 update2 15.1 update3 15.1 update4 15.1 update5 16 16 update1 16 update2 16 update3

Affected range stops below 15.1, so it looks safe — our inference, not a vendor statement

Affected range stops below 16, so it looks safe — our inference, not a vendor statement

siemens-simatic-hmi-comfort-outdoor-panels-15 (same device)

SIMATIC HMI Comfort Outdoor Panels 7 " Firmware · Siemens

95%

v < 15.1v < 1615.1 15.1 update1 15.1 update2 15.1 update3 15.1 update4 15.1 update5 16 16 update1 16 update2 16 update3

Affected range stops below 15.1, so it looks safe — our inference, not a vendor statement

Affected range stops below 16, so it looks safe — our inference, not a vendor statement

siemens-simatic-hmi-comfort-outdoor-panels-7 (same device)

SIMATIC HMI Comfort Panels 22 " Firmware · Siemens

95%

v < 15.1v < 1615.1 15.1 update1 15.1 update2 15.1 update3 15.1 update4 15.1 update5 16 16 update1 16 update2 16 update3

Affected range stops below 15.1, so it looks safe — our inference, not a vendor statement

Affected range stops below 16, so it looks safe — our inference, not a vendor statement

siemens-simatic-hmi-comfort-panels-22 (same device)

SIMATIC HMI Comfort Panels 4 " Firmware · Siemens

95%

v < 15.1v < 1615.1 15.1 update1 15.1 update2 15.1 update3 15.1 update4 15.1 update5 16 16 update1 16 update2 16 update3

Affected range stops below 15.1, so it looks safe — our inference, not a vendor statement

Affected range stops below 16, so it looks safe — our inference, not a vendor statement

siemens-simatic-hmi-comfort-panels-4 (same device)

SIMATIC HMI Ktp Mobile Panels KTP400F Firmware · Siemens

95%

v < 15.1v < 1615.1 15.1 update1 15.1 update2 15.1 update3 15.1 update4 15.1 update5 16 16 update1 16 update2 16 update3

Affected range stops below 15.1, so it looks safe — our inference, not a vendor statement

Affected range stops below 16, so it looks safe — our inference, not a vendor statement

siemens-simatic-hmi-ktp-mobile-panels-ktp400f (same device)

SIMATIC HMI Ktp Mobile Panels KTP700 Firmware · Siemens

95%

v < 15.1v < 1615.1 15.1 update1 15.1 update2 15.1 update3 15.1 update4 15.1 update5 16 16 update1 16 update2 16 update3

Affected range stops below 15.1, so it looks safe — our inference, not a vendor statement

Affected range stops below 16, so it looks safe — our inference, not a vendor statement

siemens-simatic-hmi-ktp-mobile-panels-ktp700 (same device)

SIMATIC HMI Ktp Mobile Panels KTP700F Firmware · Siemens

95%

v < 15.1v < 1615.1 15.1 update1 15.1 update2 15.1 update3 15.1 update4 15.1 update5 16 16 update1 16 update2 16 update3

Affected range stops below 15.1, so it looks safe — our inference, not a vendor statement

Affected range stops below 16, so it looks safe — our inference, not a vendor statement

siemens-simatic-hmi-ktp-mobile-panels-ktp700f (same device)

SIMATIC HMI Ktp Mobile Panels KTP900 Firmware · Siemens

95%

v < 15.1v < 1615.1 15.1 update1 15.1 update2 15.1 update3 15.1 update4 15.1 update5 16 16 update1 16 update2 16 update3

Affected range stops below 15.1, so it looks safe — our inference, not a vendor statement

Affected range stops below 16, so it looks safe — our inference, not a vendor statement

siemens-simatic-hmi-ktp-mobile-panels-ktp900 (same device)

SIMATIC HMI Ktp Mobile Panels KTP900F Firmware · Siemens

95%

v < 15.1v < 1615.1 15.1 update1 15.1 update2 15.1 update3 15.1 update4 15.1 update5 16 16 update1 16 update2 16 update3

Affected range stops below 15.1, so it looks safe — our inference, not a vendor statement

Affected range stops below 16, so it looks safe — our inference, not a vendor statement

siemens-simatic-hmi-ktp-mobile-panels-ktp900f (same device)

SIMATIC WinCC Runtime Advanced · Siemens

95%

v < 15.1v < 1615.1 15.1 update1 15.1 update2 15.1 update3 15.1 update4 15.1 update5 16 16 update1 16 update2 16 update3 All versions < V15.1 Update 6 All versions < V16 Update 4

Affected range stops below 15.1, so it looks safe — our inference, not a vendor statement

Affected range stops below 16, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (3)

x_refsource_MISCx_refsource_CONFIRMVendor Advisory

Source: [email protected]

https://cert-portal.siemens.com/productcert/pdf/ssa-286838.pdf

x_refsource_MISCx_refsource_CONFIRMVendor Advisory

Source: [email protected]

https://cert-portal.siemens.com/productcert/pdf/ssa-538778.pdf

x_refsource_MISCThird Party AdvisoryUS Government Resource

Source: [email protected]

https://us-cert.cisa.gov/ics/advisories/icsa-21-131-12

SSVC — Action Prioritization

SSVCNo known exploitAutomatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

7.5HIGHCISA-ADP

Attack Vector: NETWORK
Complexity: LOW
Privileges: NONE
User Interaction: NONE
Scope: UNCHANGED
Confidentiality: NONE
Integrity: NONE
Availability: HIGH

Vector?

Quick Info

StatusMODIFIED

CWE

CWE-400CWE-835

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