CVE-2025-40742VulnerabilityPublished 8 Jul 2025Updated 10 Nov 2026

SIPROTEC · SSA-904646: Sensitive Data Exposure Vulnerability

Affects SiemensSource GCVE Database

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Authoritative record:CVE-2025-40742· Medium 5.3

Not known to be exploited · CVSS 5.3 Medium · fixed in 11.0 : update Siemens when convenient.

Data as of 10 Nov 2026, 13:22 UTC

CVSS 3.1 base score

5.3Medium

How severe the flaw is on the 0–10 CVSS scale.

Thin evidence

One scorer or none

CVSS scores by source
CNA (siemens)	CVSS 3.1	5.3
CNA (siemens)	CVSS 4.0	6.0

Patch: Available – fixed in 11.0, 8.91

CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:N/A:N

Attack Vector: Network
Attack Complexity: High
Privileges Required: None
User Interaction: Required
Scope: Unchanged
Confidentiality: High
Integrity: None
Availability: None

Bold values are the worst case: easiest to exploit or largest impact.

Attack Vector: Network: The vulnerable component is bound to the network stack and the set of possible attackers extends beyond the other options listed, up to and including the entire Internet. Such a vulnerability is often termed 'remotely exploitable' and can be thought of as an attack being exploitable at the protocol level one or more network hops away (e.g., across one or more routers).
Attack Complexity: High: A successful attack depends on conditions beyond the attacker's control. That is, a successful attack cannot be accomplished at will, but requires the attacker to invest in some measurable amount of effort in preparation or execution against the vulnerable component before a successful attack can be expected. For example, a successful attack may require an attacker to: gather knowledge about the environment in which the vulnerable target/component exists; prepare the target environment to improve exploit reliability; or inject themselves into the logical network path between the target and the resource requested by the victim in order to read and/or modify network communications (e.g., a man in the middle attack).
Privileges Required: None: The attacker is unauthorized prior to attack, and therefore does not require any access to settings or files to carry out an attack.
User Interaction: Required: Successful exploitation of this vulnerability requires a user to take some action before the vulnerability can be exploited.
Scope: Unchanged: An exploited vulnerability can only affect resources managed by the same security authority. In this case, the vulnerable component and the impacted component are either the same, or both are managed by the same security authority.
Confidentiality: High: There is total loss of confidentiality, resulting in all resources within the impacted component being divulged to the attacker. Alternatively, access to only some restricted information is obtained, but the disclosed information presents a direct, serious impact.
Integrity: None: There is no loss of integrity within the impacted component.
Availability: None: There is no impact to availability within the impacted component.

Definitions: FIRST CVSS v3.1 specification.

Exploitation evidence

Disclosed: evidence found.
CVE published 8 Jul 2025
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 10 Nov 2026.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponized: A Metasploit exploit module or Exploit-DB entry exists (Metasploit scanner modules do not count), or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

siemens-productcert

What to do

Upgrade SIPROTEC 5 to 11.0 (6MD84 (CP300), 6MD85 (CP300), 6MD86 (CP300), 6MD89 (CP300), 6MD89 (CP300) V9.6x, 6MU85 (CP300), 7KE85 (CP300), 7SA82 (CP150), 7SA86 (CP300), 7SA87 (CP300), 7SD82 (CP150), 7SD86 (CP300), 7SD87 (CP300), 7SJ81 (CP150), 7SJ82 (CP150), 7SJ85 (CP300), 7SJ86 (CP300), 7SK82 (CP150), 7SK85 (CP300), 7SL82 (CP150), 7SL86 (CP300), 7SL87 (CP300), 7SS85 (CP300), 7ST85 (CP300), 7ST86 (CP300), 7SX82 (CP150), 7SX85 (CP300), 7SY82 (CP150), 7UM85 (CP300), 7UT82 (CP150), 7UT85 (CP300), 7UT86 (CP300), 7UT87 (CP300), 7VE85 (CP300), 7VK87 (CP300), 7VU85 (CP300), Compact 7SX800 (CP050)) or 8.91 ((CP100)).

Affected software

Product	Affected	Fixed in
SiemensSIPROTEC 5 6MD84 (CP300)	Affected <11.0	Fixed in 11.0
SiemensSIPROTEC 5 6MD85 (CP300)	Affected <11.0	Fixed in 11.0
SiemensSIPROTEC 5 6MD86 (CP300)	Affected <11.0	Fixed in 11.0
SiemensSIPROTEC 5 6MD89 (CP300)	Affected <11.0	Fixed in 11.0
SiemensSIPROTEC 5 6MD89 (CP300) V9.6x	Affected <11.0	Fixed in 11.0
SiemensSIPROTEC 5 6MU85 (CP300)	Affected <11.0	Fixed in 11.0

AI-suggested

Siemens advises applying the provided security updates using official tools and documented procedures, validating updates prior to deployment, and supervising the update process by trained personnel. Additionally, operators should protect network access with firewalls, segmentation, and VPNs, and configure devices according to Siemens operational guidelines.

Description

A sensitive data exposure vulnerability (CVE-2025-40742) affects Siemens SIPROTEC 5 devices used in critical power systems. Operators are advised to ensure resilient protection schemes and apply Siemens security updates following documented procedures. Siemens recommends network protection measures such as firewalls, segmentation, and VPNs to secure device environments.

Impact

Exposure of sensitive data in critical power system protection devices could potentially undermine grid reliability if exploited. However, no active exploitation or specific impact scenarios are documented. The vulnerability highlights the importance of resilient grid design and secure device management to reduce cyber incident risks.

Summary

This vulnerability involves sensitive data exposure in Siemens SIPROTEC 5 devices, which are used in critical power grid protection systems. The advisory emphasizes the importance of multi-level redundant secondary protection schemes to minimize cyber incident risks affecting grid reliability. Siemens strongly recommends applying provided security updates using official tooling and procedures, validating updates before deployment, and protecting network access with appropriate security mechanisms. No detailed technical or version-specific information is available, and no known exploits are reported.

CWE-598Use of HTTP Request With Sensitive Query String (opens in a new tab)
Variant weaknessOWASP Top 10 A06:2025: Insecure Design (opens in a new tab)
The web application uses an HTTP method to process a request, but the request includes sensitive information in the query string.
Implementation
When sending sensitive information, only include it in the request body or request headers instead of the query string. This may require avoiding use of GET requests.
OWASP Cheat Sheets
Server Side Request Forgery Prevention (opens in a new tab)
Web Service Security (opens in a new tab)
Secure Design Principles (opens in a new tab)
OWASP ASVS 4.0.3
V3.1.1 (opens in a new tab)
V13.1.3 (opens in a new tab)
V8.3.4 (opens in a new tab)
From MITRE CWE, MITRE CAPEC and OWASP (Top 10, OpenCRE).

References

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Exploitation evidence

What to do

Affected software

Description

AI analysisMachine-generated, updated 10 Nov 2026, 13:22 UTC

WeaknessesCWE-598

Technical details

References

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