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CVE-2025-40795

33
FAUCET Score

CVE-2025-40795 is a critical stack-based buffer overflow vulnerability affecting Siemens SIMATIC PCS neo (V4.1, V5.0, V6.0) and the User Management Component (UMC) (all versions prior to V2.15.1.3). This flaw allows an unauthenticated remote attacker to execute arbitrary code or cause a denial of service. With a CVSS score of 9.8 (CRITICAL), it presents a high risk due to its network attack vector, low attack complexity, and severe impact on confidentiality, integrity, and availability. While there is no evidence of active exploitation, public exploit code, or KEV listing, the vulnerability has garnered significant community discussion, indicating awareness among security researchers.

Impacted Technologies

VendorProductVersion(s)CPE
4.1CPE matchmatch criteria
cpe:2.3:a:siemens:simatic_pcs_neo:4.1:*:*:*:*:*:*:*
5.0CPE matchmatch criteria
cpe:2.3:a:siemens:simatic_pcs_neo:5.0:*:*:*:*:*:*:*
< 2.15.1.3CPE matchmatch criteria
cpe:2.3:a:siemens:user_management_component:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 4.0

9.3CRITICAL

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
NONE
User Interaction
NONE
VS Confidentiality
HIGH
VS Integrity
HIGH
VS Availability
HIGH
SS Confidentiality
NONE
SS Integrity
NONE
SS Availability
NONE
Exploit Maturity
NOT_DEFINED
CvssVersion
4.0

Exploit Intelligence

EPSS Score
0.66%
Probability of exploitation in next 30 days
EPSS Percentile
48.0%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0066 is in the 30th percentile among its peer group of 36,862 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.3 Bluesky, 0.3 Mastodon, and 2.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Vendor Patches (5)

azurevendor investigatingvia llm_extracted
Fixed in: 2.15.1.1
entrustvendor investigatingvia llm_extracted
moxavendor investigatingvia llm_extracted
phoenix_contactvendor investigatingvia llm_extracted
qwikvendor investigatingvia llm_extracted

Vendor Advisories (5)

moxallm-moxa-cabf076a2efe0d2fCRITICAL

Siemens User Management Component V2.15.1.1 Multiple Vulnerabilities

Sep 8, 2025
entrustllm-entrust-9080286a697d29e2CRITICAL

Siemens User Management Component V2.15.1.1 Multiple Vulnerabilities

Sep 8, 2025
azurellm-azure-4ac5426c6499d90bCRITICAL

Siemens User Management Component V2.15.1.1 Multiple Vulnerabilities

Sep 8, 2025
phoenix_contactllm-phoenix_contact-84a92a3121cbddc4CRITICAL

Siemens User Management Component V2.15.1.1 Multiple Vulnerabilities

Sep 8, 2025
qwikllm-qwik-e858c30d296dec07CRITICAL

Siemens User Management Component V2.15.1.1 Multiple Vulnerabilities

Sep 8, 2025

References

cert-portal.siemens.com / productcert/html/ssa-722410.html
Vendor Advisory