What is the CVSS score of CVE-2020-15798?

CVE-2020-15798 has a CVSS 3.1 base score of 9.8 (Critical). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H. EPSS exploitation probability: 1.7%.

Is there a patch available for CVE-2020-15798?

Yes, a patch is available for CVE-2020-15798. Update the affected software to the latest version immediately.

Sinamics Gh150 Firmware CVE-2020-15798

CRITICAL

Missing Authentication for Critical Function (CWE-306)

2021-02-09 productcert@siemens.com

Authentication Bypass Siemens Sinamics Gh150 Firmware Sinamics Gl150 Firmware Sinamics Gm150 Firmware Sinamics Sl150 Firmware Sinamics Sm120 Firmware Simatic Hmi Comfort Panels Firmware Simatic Hmi Ktp Mobile Panels Firmware Sinamics Sh150 Firmware Sinamics Sm150 Firmware Sinamics Sm150I Firmware

9.8

CVSS 3.1 · NVD

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Vulnerability Assessment

Weakness	CWE CWE-306 OWASP Top 10:2025 A07:2025 - Authentication Failures ASVS 5.0 V6 - Authentication Authentication required for critical functions MITRE ATT&CK 1 technique across 1 tactic: Initial Access The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up. Sign in to read
Impact	CVSS score of 9.8 (CRITICAL). Attack characteristics: network attack vector, low complexity, no privileges required, no user interaction not required. EPSS exploitation probability: 1.67%.
Exploit ScenarioDerived	A remote attacker could access critical functionality without authentication by sending crafted requests to the affected application. No authentication is required to exploit this vulnerability.

Act Now Prioritize within 24-48h. Why: CRITICAL severity.

Patch available 1.7% exploitation probability (EPSS)

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AnalysisAI

A vulnerability has been identified in SIMATIC HMI Comfort Panels (incl. Rated critical severity (CVSS 9.8), this vulnerability is remotely exploitable, no authentication required, low attack complexity. This Missing Authentication for Critical Function vulnerability could allow attackers to access critical functionality without authentication.

RemediationAI

A vendor patch is available. Apply the latest security update as soon as possible. Require authentication for all sensitive operations, implement defense in depth.

Affects your stack

Find out whether the stacks and servers you run are on an affected version.

Checking this CVE against your own stacks and servers is part of the Basic plan and up.

Technical ContextAI · show details

This vulnerability is classified as Missing Authentication for Critical Function (CWE-306), which allows attackers to access critical functionality without authentication. A vulnerability has been identified in SIMATIC HMI Comfort Panels (incl. SIPLUS variants) (All versions < V16 Update 3a), SIMATIC HMI KTP Mobile Panels (All versions < V16 Update 3a), 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). Affected devices with enabled telnet service do not require authentication for this service. This could allow a remote attacker to gain full access to the device. (ZDI-CAN-12046) Affected products include: Siemens Simatic Hmi Comfort Panels Firmware, Siemens Simatic Hmi Ktp Mobile Panels Firmware, Siemens Sinamics Gh150 Firmware, Siemens Sinamics Gl150 Firmware, Siemens Sinamics Gm150 Firmware.

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Exploit and PoC references, threat intelligence from 22 sources

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Severity by source

NVD PRIMARY 9.8 CRITICAL

AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

DescriptionCVE.org

A vulnerability has been identified in SIMATIC HMI Comfort Panels (incl. SIPLUS variants) (All versions < V16 Update 3a), SIMATIC HMI KTP Mobile Panels (All versions < V16 Update 3a), 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). Affected devices with enabled telnet service do not require authentication for this service. This could allow a remote attacker to gain full access to the device. (ZDI-CAN-12046)

Threat Intelligence Overview

EPSS Score

1.7%

Top 18% exploitable

Data Quality

4 sources

Confidence: Medium

NVD

CVE.org

EPSS

VulDB

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue

Severity CRITICAL

CISA KEV No

Public POC No

EPSS 1.7%

Patch available Yes

Active threat No

Deciding rule

CRITICAL severity

What every action level means

Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.

Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.

This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.

This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.

Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.

SSVC AssessmentENISA

SSVC Decision· derived

Scheduled

Exploitation· derived

None

System Exposure· derived

Open

Automatable· derived

Yes

Human Impact· derived

Medium

Priority Score

Low Medium High Critical

KEV: 0

EPSS: +2

CVSS: +49

PoC: 0

Weaponized: 0

Threat intel: 0

Gov advisory: 0

Attack Technique

Authentication Bypass CRITICAL

Authentication bypass attacks exploit flaws in the verification mechanisms that control access to systems and applications.

Affected Products (CPE)CVE.org

cpe:2.3:o:siemens:simatic_hmi_comfort_panels_firmware:*:*:*:*:*:*:*:*

cpe:2.3:o:siemens:simatic_hmi_comfort_panels_firmware:16.0:-:*:*:*:*:*:*

cpe:2.3:o:siemens:simatic_hmi_comfort_panels_firmware:16.0:update1:*:*:*:*:*:*

cpe:2.3:o:siemens:simatic_hmi_comfort_panels_firmware:16.0:update2:*:*:*:*:*:*

cpe:2.3:o:siemens:simatic_hmi_comfort_panels_firmware:16.0:update3:*:*:*:*:*:*

cpe:2.3:o:siemens:simatic_hmi_ktp_mobile_panels_firmware:*:*:*:*:*:*:*:*

cpe:2.3:o:siemens:simatic_hmi_ktp_mobile_panels_firmware:16.0:-:*:*:*:*:*:*

cpe:2.3:o:siemens:simatic_hmi_ktp_mobile_panels_firmware:16.0:update1:*:*:*:*:*:*

cpe:2.3:o:siemens:simatic_hmi_ktp_mobile_panels_firmware:16.0:update2:*:*:*:*:*:*

cpe:2.3:o:siemens:simatic_hmi_ktp_mobile_panels_firmware:16.0:update3:*:*:*:*:*:*

cpe:2.3:o:siemens:sinamics_gh150_firmware:-:*:*:*:*:*:*:*

cpe:2.3:o:siemens:sinamics_gl150_firmware:-:*:*:*:*:*:*:*

cpe:2.3:o:siemens:sinamics_gm150_firmware:-:*:*:*:*:*:*:*

cpe:2.3:o:siemens:sinamics_sh150_firmware:-:*:*:*:*:*:*:*

cpe:2.3:o:siemens:sinamics_sl150_firmware:-:*:*:*:*:*:*:*

cpe:2.3:o:siemens:sinamics_sm150_firmware:-:*:*:*:*:*:*:*

cpe:2.3:o:siemens:sinamics_sm120_firmware:-:*:*:*:*:*:*:*

cpe:2.3:o:siemens:sinamics_sm150i_firmware:-:*:*:*:*:*:*:*

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References

Advisories & patches

PATCH https://cert-portal.siemens.com/productcert/pdf/ssa-752103.pdf ADVISORY https://cert-portal.siemens.com/productcert/pdf/ssa-520004.pdf ADVISORY https://vuldb.com/vuln/169560 REF https://us-cert.cisa.gov/ics/advisories/icsa-21-033-02

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