Vulnerability Database

328,409

Total vulnerabilities in the database

CVE-2021-27385

A vulnerability has been identified in SIMATIC HMI Comfort Outdoor Panels V15 7&quot; & 15&quot; (incl. SIPLUS variants) (All versions < V15.1 Update 6), SIMATIC HMI Comfort Outdoor Panels V16 7&quot; & 15&quot; (incl. SIPLUS variants) (All versions < V16 Update 4), SIMATIC HMI Comfort Panels V15 4&quot; - 22&quot; (incl. SIPLUS variants) (All versions < V15.1 Update 6), SIMATIC HMI Comfort Panels V16 4&quot; - 22&quot; (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.

  • Published: May 12, 2021
  • Updated: Nov 16, 2025
  • CVE: CVE-2021-27385
  • Severity: High
  • Exploit:

CVSS v3:

  • Severity: High
  • Score: 7.5
  • AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS v2:

  • Severity: Medium
  • Score: 5
  • AV:N/AC:L/Au:N/C:N/I:N/A:P
Software From Fixed in
siemens / simatic_wincc_runtime_advanced 16-update1 16-update1.x
siemens / simatic_wincc_runtime_advanced 16-update2 16-update2.x
siemens / simatic_wincc_runtime_advanced 16-update3 16-update3.x
siemens / simatic_wincc_runtime_advanced 16 16.x
siemens / simatic_wincc_runtime_advanced - 16
siemens / sinamics_sh150_firmware - -
siemens / sinamics_sm150i_firmware - -
siemens / sinamics_gh150_firmware - -
siemens / sinamics_gl150_firmware - -
siemens / sinamics_gm150_firmware - -
siemens / sinamics_sl150_firmware - -
siemens / sinamics_sm120_firmware - -
siemens / sinamics_sm150_firmware - -
siemens / simatic_hmi_comfort_outdoor_panels_7"_firmware - 16
siemens / simatic_hmi_comfort_outdoor_panels_7"_firmware 16-update1 16-update1.x
siemens / simatic_hmi_comfort_outdoor_panels_7"_firmware 16-update2 16-update2.x
siemens / simatic_hmi_comfort_outdoor_panels_7"_firmware 16-update3 16-update3.x
siemens / simatic_hmi_comfort_outdoor_panels_7"_firmware 16 16.x
siemens / simatic_hmi_comfort_outdoor_panels_15"_firmware - 16
siemens / simatic_hmi_comfort_outdoor_panels_15"_firmware 16-update1 16-update1.x
siemens / simatic_hmi_comfort_outdoor_panels_15"_firmware 16-update2 16-update2.x
siemens / simatic_hmi_comfort_outdoor_panels_15"_firmware 16-update3 16-update3.x
siemens / simatic_hmi_comfort_outdoor_panels_15"_firmware 16 16.x
siemens / simatic_hmi_comfort_panels_4"_firmware - 16
siemens / simatic_hmi_comfort_panels_4"_firmware 16-update2 16-update2.x
siemens / simatic_hmi_comfort_panels_4"_firmware 16-update3 16-update3.x
siemens / simatic_hmi_comfort_panels_4"_firmware 16-update1 16-update1.x
siemens / simatic_hmi_comfort_panels_4"_firmware 16 16.x
siemens / simatic_hmi_comfort_panels_22"_firmware - 16
siemens / simatic_hmi_comfort_panels_22"_firmware 16-update1 16-update1.x
siemens / simatic_hmi_comfort_panels_22"_firmware 16-update2 16-update2.x
siemens / simatic_hmi_comfort_panels_22"_firmware 16-update3 16-update3.x
siemens / simatic_hmi_comfort_panels_22"_firmware 16 16.x
siemens / simatic_hmi_ktp_mobile_panels_ktp400f_firmware - 16
siemens / simatic_hmi_ktp_mobile_panels_ktp400f_firmware 16-update1 16-update1.x
siemens / simatic_hmi_ktp_mobile_panels_ktp400f_firmware 16-update2 16-update2.x
siemens / simatic_hmi_ktp_mobile_panels_ktp400f_firmware 16-update3 16-update3.x
siemens / simatic_hmi_ktp_mobile_panels_ktp400f_firmware 16 16.x
siemens / simatic_hmi_ktp_mobile_panels_ktp700_firmware - 16
siemens / simatic_hmi_ktp_mobile_panels_ktp700_firmware 16-update1 16-update1.x
siemens / simatic_hmi_ktp_mobile_panels_ktp700_firmware 16-update2 16-update2.x
siemens / simatic_hmi_ktp_mobile_panels_ktp700_firmware 16-update3 16-update3.x
siemens / simatic_hmi_ktp_mobile_panels_ktp700_firmware 16 16.x
siemens / simatic_hmi_ktp_mobile_panels_ktp700f_firmware - 16
siemens / simatic_hmi_ktp_mobile_panels_ktp700f_firmware 16-update1 16-update1.x
siemens / simatic_hmi_ktp_mobile_panels_ktp700f_firmware 16-update2 16-update2.x
siemens / simatic_hmi_ktp_mobile_panels_ktp700f_firmware 16-update3 16-update3.x
siemens / simatic_hmi_ktp_mobile_panels_ktp700f_firmware 16 16.x
siemens / simatic_hmi_ktp_mobile_panels_ktp900_firmware - 16
siemens / simatic_hmi_ktp_mobile_panels_ktp900_firmware 16-update1 16-update1.x
siemens / simatic_hmi_ktp_mobile_panels_ktp900_firmware 16-update2 16-update2.x
siemens / simatic_hmi_ktp_mobile_panels_ktp900_firmware 16-update3 16-update3.x
siemens / simatic_hmi_ktp_mobile_panels_ktp900_firmware 16 16.x
siemens / simatic_hmi_ktp_mobile_panels_ktp900f_firmware - 16
siemens / simatic_hmi_ktp_mobile_panels_ktp900f_firmware 16-update1 16-update1.x
siemens / simatic_hmi_ktp_mobile_panels_ktp900f_firmware 16-update2 16-update2.x
siemens / simatic_hmi_ktp_mobile_panels_ktp900f_firmware 16-update3 16-update3.x
siemens / simatic_hmi_ktp_mobile_panels_ktp900f_firmware 16 16.x
siemens / simatic_hmi_comfort_outdoor_panels_7"_firmware - 15.1
siemens / simatic_hmi_comfort_outdoor_panels_7"_firmware 15.1 15.1.x
siemens / simatic_hmi_comfort_outdoor_panels_7"_firmware 15.1-update1 15.1-update1.x
siemens / simatic_hmi_comfort_outdoor_panels_7"_firmware 15.1-update2 15.1-update2.x
siemens / simatic_hmi_comfort_outdoor_panels_7"_firmware 15.1-update3 15.1-update3.x
siemens / simatic_hmi_comfort_outdoor_panels_7"_firmware 15.1-update4 15.1-update4.x
siemens / simatic_hmi_comfort_outdoor_panels_7"_firmware 15.1-update5 15.1-update5.x
siemens / simatic_hmi_comfort_outdoor_panels_15"_firmware - 15.1
siemens / simatic_hmi_comfort_outdoor_panels_15"_firmware 15.1 15.1.x
siemens / simatic_hmi_comfort_outdoor_panels_15"_firmware 15.1-update1 15.1-update1.x
siemens / simatic_hmi_comfort_outdoor_panels_15"_firmware 15.1-update2 15.1-update2.x
siemens / simatic_hmi_comfort_outdoor_panels_15"_firmware 15.1-update3 15.1-update3.x
siemens / simatic_hmi_comfort_outdoor_panels_15"_firmware 15.1-update4 15.1-update4.x
siemens / simatic_hmi_comfort_outdoor_panels_15"_firmware 15.1-update5 15.1-update5.x
siemens / simatic_hmi_comfort_panels_4"_firmware - 15.1
siemens / simatic_hmi_comfort_panels_4"_firmware 15.1 15.1.x
siemens / simatic_hmi_comfort_panels_4"_firmware 15.1-update1 15.1-update1.x
siemens / simatic_hmi_comfort_panels_4"_firmware 15.1-update2 15.1-update2.x
siemens / simatic_hmi_comfort_panels_4"_firmware 15.1-update3 15.1-update3.x
siemens / simatic_hmi_comfort_panels_4"_firmware 15.1-update4 15.1-update4.x
siemens / simatic_hmi_comfort_panels_4"_firmware 15.1-update5 15.1-update5.x
siemens / simatic_hmi_comfort_panels_22"_firmware - 15.1
siemens / simatic_hmi_comfort_panels_22"_firmware 15.1 15.1.x
siemens / simatic_hmi_comfort_panels_22"_firmware 15.1-update1 15.1-update1.x
siemens / simatic_hmi_comfort_panels_22"_firmware 15.1-update2 15.1-update2.x
siemens / simatic_hmi_comfort_panels_22"_firmware 15.1-update3 15.1-update3.x
siemens / simatic_hmi_comfort_panels_22"_firmware 15.1-update4 15.1-update4.x
siemens / simatic_hmi_comfort_panels_22"_firmware 15.1-update5 15.1-update5.x
siemens / simatic_hmi_ktp_mobile_panels_ktp400f_firmware - 15.1
siemens / simatic_hmi_ktp_mobile_panels_ktp400f_firmware 15.1 15.1.x
siemens / simatic_hmi_ktp_mobile_panels_ktp400f_firmware 15.1-update4 15.1-update4.x
siemens / simatic_hmi_ktp_mobile_panels_ktp400f_firmware 15.1-update5 15.1-update5.x
siemens / simatic_hmi_ktp_mobile_panels_ktp400f_firmware 15.1-update1 15.1-update1.x
siemens / simatic_hmi_ktp_mobile_panels_ktp400f_firmware 15.1-update2 15.1-update2.x
siemens / simatic_hmi_ktp_mobile_panels_ktp400f_firmware 15.1-update3 15.1-update3.x
siemens / simatic_hmi_ktp_mobile_panels_ktp700_firmware - 15.1
siemens / simatic_hmi_ktp_mobile_panels_ktp700_firmware 15.1 15.1.x
siemens / simatic_hmi_ktp_mobile_panels_ktp700_firmware 15.1-update1 15.1-update1.x
siemens / simatic_hmi_ktp_mobile_panels_ktp700_firmware 15.1-update2 15.1-update2.x
siemens / simatic_hmi_ktp_mobile_panels_ktp700_firmware 15.1-update3 15.1-update3.x
siemens / simatic_hmi_ktp_mobile_panels_ktp700_firmware 15.1-update4 15.1-update4.x
siemens / simatic_hmi_ktp_mobile_panels_ktp700_firmware 15.1-update5 15.1-update5.x
siemens / simatic_hmi_ktp_mobile_panels_ktp700f_firmware - 15.1
siemens / simatic_hmi_ktp_mobile_panels_ktp700f_firmware 15.1 15.1.x
siemens / simatic_hmi_ktp_mobile_panels_ktp700f_firmware 15.1-update4 15.1-update4.x
siemens / simatic_hmi_ktp_mobile_panels_ktp700f_firmware 15.1-update5 15.1-update5.x
siemens / simatic_hmi_ktp_mobile_panels_ktp700f_firmware 15.1-update1 15.1-update1.x
siemens / simatic_hmi_ktp_mobile_panels_ktp700f_firmware 15.1-update2 15.1-update2.x
siemens / simatic_hmi_ktp_mobile_panels_ktp700f_firmware 15.1-update3 15.1-update3.x
siemens / simatic_hmi_ktp_mobile_panels_ktp900_firmware - 15.1
siemens / simatic_hmi_ktp_mobile_panels_ktp900_firmware 15.1 15.1.x
siemens / simatic_hmi_ktp_mobile_panels_ktp900_firmware 15.1-update1 15.1-update1.x
siemens / simatic_hmi_ktp_mobile_panels_ktp900_firmware 15.1-update2 15.1-update2.x
siemens / simatic_hmi_ktp_mobile_panels_ktp900_firmware 15.1-update3 15.1-update3.x
siemens / simatic_hmi_ktp_mobile_panels_ktp900_firmware 15.1-update4 15.1-update4.x
siemens / simatic_hmi_ktp_mobile_panels_ktp900_firmware 15.1-update5 15.1-update5.x
siemens / simatic_hmi_ktp_mobile_panels_ktp900f_firmware - 15.1
siemens / simatic_hmi_ktp_mobile_panels_ktp900f_firmware 15.1 15.1.x
siemens / simatic_hmi_ktp_mobile_panels_ktp900f_firmware 15.1-update1 15.1-update1.x
siemens / simatic_hmi_ktp_mobile_panels_ktp900f_firmware 15.1-update2 15.1-update2.x
siemens / simatic_hmi_ktp_mobile_panels_ktp900f_firmware 15.1-update3 15.1-update3.x
siemens / simatic_hmi_ktp_mobile_panels_ktp900f_firmware 15.1-update4 15.1-update4.x
siemens / simatic_hmi_ktp_mobile_panels_ktp900f_firmware 15.1-update5 15.1-update5.x
siemens / simatic_wincc_runtime_advanced 15.1-update1 15.1-update1.x
siemens / simatic_wincc_runtime_advanced 15.1-update2 15.1-update2.x
siemens / simatic_wincc_runtime_advanced 15.1-update3 15.1-update3.x
siemens / simatic_wincc_runtime_advanced - 15.1
siemens / simatic_wincc_runtime_advanced 15.1 15.1.x
siemens / simatic_wincc_runtime_advanced 15.1-update4 15.1-update4.x
siemens / simatic_wincc_runtime_advanced 15.1-update5 15.1-update5.x

Frequently Asked Questions

A security vulnerability is a weakness in software, hardware, or configuration that can be exploited to compromise confidentiality, integrity, or availability. Many vulnerabilities are tracked as CVEs (Common Vulnerabilities and Exposures), which provide a standardized identifier so teams can coordinate patching, mitigation, and risk assessment across tools and vendors.

CVSS (Common Vulnerability Scoring System) estimates technical severity, but it doesn't automatically equal business risk. Prioritize using context like internet exposure, affected asset criticality, known exploitation (proof-of-concept or in-the-wild), and whether compensating controls exist. A "Medium" CVSS on an exposed, production system can be more urgent than a "Critical" on an isolated, non-production host.

A vulnerability is the underlying weakness. An exploit is the method or code used to take advantage of it. A zero-day is a vulnerability that is unknown to the vendor or has no publicly available fix when attackers begin using it. In practice, risk increases sharply when exploitation becomes reliable or widespread.

Recurring findings usually come from incomplete Asset Discovery, inconsistent patch management, inherited images, and configuration drift. In modern environments, you also need to watch the software supply chain: dependencies, containers, build pipelines, and third-party services can reintroduce the same weakness even after you patch a single host. Unknown or unmanaged assets (often called Shadow IT) are a common reason the same issues resurface.

Use a simple, repeatable triage model: focus first on externally exposed assets, high-value systems (identity, VPN, email, production), vulnerabilities with known exploits, and issues that enable remote code execution or privilege escalation. Then enforce patch SLAs and track progress using consistent metrics so remediation is steady, not reactive.

SynScan combines attack surface monitoring and continuous security auditing to keep your inventory current, flag high-impact vulnerabilities early, and help you turn raw findings into a practical remediation plan.