EUVD-2025-20433Vulnerability Assessment
| Weakness |
CWE
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. |
| Impact | Unauthorized access to protected functionality, data, or administrative interfaces, potentially leading to full system compromise. With a CVSS score of 9.8 (CRITICAL), this represents a critical risk. |
| Exploit ScenarioDerived | An attacker manipulates authentication tokens, exploits logic flaws, or uses default credentials to bypass the login mechanism and access restricted areas. |
Get an e-mail when this CVE is exploited, patched or re-scored. Free account.
Alert meAnalysisAIv1 – Mar 16, 2026
A vulnerability has been identified in SINEC NMS (All versions < V4.0). The affected application exposes an endpoint that allows an unauthorized modification of administrative credentials. This could allow an unauthenticated attacker to reset the superadmin password and gain full control of the application (ZDI-CAN-26569).
Earlier versions of this analysis (1)
RemediationAI
Implement robust authentication mechanisms. Use multi-factor authentication. Review authentication logic for bypass conditions. Remove default credentials.
Affected VersionsENISA
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
An authentication bypass vulnerability allows attackers to circumvent login mechanisms and gain unauthorized access without valid credentials. This vulnerability is classified as Missing Authentication for Critical Function (CWE-306).
Know when Sinec Nms gets its next vulnerability
- Watch products and get an email when something new is published
- Check this CVE against your own stack and servers
- Exploit and PoC references, threat intelligence from 22 sources
No credit card · 7-day full trial
Severity by source
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
Executive ViewAI
Organizations using A vulnerability face critical risk from CVE-2025-40736, a missing authentication vulnerability rated CVSS 9.8. Attackers could bypass security controls to gain unauthorized access to protected resources and sensitive data. Organizations should apply vendor updates immediately when available and implement compensating controls in the interim.
Apply vendor patch. If immediate patching is not feasible: (1) Implement network-level access controls; (2) Enable MFA where possible; (3) Monitor authentication logs for anomalous access.
Threat Intelligence Overview
NVD
CVE.org
EPSS
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.
What every action level means
SSVC AssessmentENISA
Priority Score
Attack Technique
Authentication bypass attacks exploit flaws in the verification mechanisms that control access to systems and applications.
A crafted request uri-path can cause mod_proxy to forward the request to an origin server choosen by the remote user.4.4
An OpenSSL TLS server may crash if sent a maliciously crafted renegotiation ClientHello message from a client. Rated med
SINEC NMS versions prior to V4.0 SP3 allow authenticated remote attackers to reset any user account password due to impr
In logback version 1.2.7 and prior versions, an attacker with the required privileges to edit configurations files could
A vulnerability has been identified in SINEC NMS (All versions < V2.0 SP1). Rated critical severity (CVSS 9.8), this vul
ap_escape_quotes() may write beyond the end of a buffer when given malicious input. Rated critical severity (CVSS 9.8),
A vulnerability has been identified in SINEC NMS (All versions < V3.0). Rated critical severity (CVSS 9.4), this vulnera
A vulnerability has been identified in SINEC NMS (All versions < V1.0 SP2 Update 1). Rated critical severity (CVSS 9.1),
A vulnerability has been identified in SINEC NMS (All versions < V1.0 SP2 Update 1). Rated critical severity (CVSS 9.1),
Authentication bypass in Siemens SINEC NMS versions prior to V4.0 SP3 with UMC allows unauthenticated remote attackers t
A vulnerability has been identified in SINEC NMS (All versions < V4.0). The affected application does not properly valid
A vulnerability has been identified in SINEC NMS (All versions < V4.0). The affected application does not properly valid
GitHub PoC
Exploit-DB