SIMATIC HMI MTP1000 Unified Comfort Panel: Initialization of a Resource with an Insecure Default
CVE-2026-27662 is a high-severity initialization of a resource with an insecure default vulnerability in SIMATIC HMI MTP1000 Unified Comfort Panel from Siemens, with a CVSS 3.1 base score of 7.7 out of 10. It can be exploited with local access to the system by an unauthenticated attacker, without any action from a user. The record lists version V21 as the first without the flaw, so updating SIMATIC HMI MTP1000 Unified Comfort Panel to that release or later removes the exposure. There is no confirmed exploitation so far. EPSS estimates a 0.11% chance of exploitation within 30 days, which is low compared with other CVEs.
High severity with no evidence of exploitation so far.
What to do
- Update SIMATIC HMI MTP1000 Unified Comfort Panel to V21 or a later version.
- Update SIMATIC HMI MTP1000 Unified Comfort Panel hygienic to V21 or a later version.
- Update SIMATIC HMI MTP1000 Unified Comfort Panel hygienic neutral design to V21 or a later version.
Affected products and versions
Version data comes from the organisation that assigned the CVE; 25 further products are omitted here. Confirm against the vendor advisory before deciding you are unaffected.
How the severity score breaks down
- Attack vector
- LocalThe attacker needs local access or must trick a user into running something.
- Attack complexity
- LowNo special conditions are needed; the attack works reliably.
- Privileges required
- NoneNo account or login is needed.
- User interaction
- NoneNo action by a victim is required.
- Scope
- UnchangedImpact stays within the vulnerable component.
- Confidentiality
- NoneNo data is disclosed.
- Integrity
- HighData or code can be modified at will.
- Availability
- HighThe component can be taken down completely.
Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H. Scored by CNA (siemens.com).
| Scoring system | Score | Severity | Scored by |
|---|---|---|---|
| CVSS 4.0 | 7.0 | High | CNA (siemens.com) |
| CVSS 3.1 | 7.7 | High | CNA (siemens.com) |
Official description
Affected devices do not properly restrict access to the web browser via the Control Panel when no corresponding security mechanisms are in place. This could allow an unauthenticated attacker to gain unauthorized access to the web browser, potentially enabling the discovery of backdoors, performing unauthorized actions, or exploiting misconfigurations that may lead to further system compromise.
Source: the CVE record as published by its numbering authority, via NVD and CVE.org.
The underlying weakness: Initialization of a Resource with an Insecure Default
The product initializes or sets a resource with a default that is intended to be changed by the product's installer, administrator, or maintainer, but the default is not secure.
More Initialization of a Resource with an Insecure Default vulnerabilities (CWE-1188)
Timeline
- CVE record published.
- CISA published its SSVC assessment (exploitation: none, automatable: no, technical impact: partial).
- Record last changed materially (score, affected products, status or references).
References
Other references
Other vulnerabilities in SIMATIC HMI MTP1000 Unified Comfort Panel
- 9.1 Critical severity
- 7.8 High severity
- 10.0 Critical severity
Recent Initialization of a Resource with an Insecure Default vulnerabilities
- 9.1 Critical severity
- 7.5 High severity
- 9.8 Critical severity
- 9.6 Critical severity
- 7.2 High severity
- 9.8 Critical severity
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