CVE-2025-42611: CWE-295 Improper certificate validation in Mikrotik RouterOS
RouterOS provides various services that rely on correct verification of client and server certificates to secure confidentiality and integrity of communications. This includes OpenVPN, CAPsMAN, Dot1x (802.1X), among others. The vulnerability lies in shared certificate validation logic which uses the system certificate store that is shared and equally trusted by all system services. This causes confusion of scope, allowing any certificate authority present in the system-wide trust store to be trusted in any context (with some exceptions), allowing partial or full authentication bypass in CAPsMAN, OpenVPN, Dot1X and potentially others.
AI Analysis
Technical Summary
Mikrotik RouterOS contains a vulnerability (CVE-2025-42611) due to improper certificate validation (CWE-295). The system uses a shared certificate store for multiple services including OpenVPN, CAPsMAN, and Dot1X, which causes scope confusion in trust validation. This allows any certificate authority present in the system-wide trust store to be trusted in contexts where it should not be, potentially enabling partial or full authentication bypass in affected services. The vulnerability has a CVSS 3.1 base score of 6.5, indicating medium severity. No patch or official remediation level has been published as of the data provided.
Potential Impact
The vulnerability can lead to partial or full authentication bypass in several RouterOS services that rely on certificate validation, including CAPsMAN, OpenVPN, and Dot1X. This undermines the confidentiality and integrity of communications secured by these services. However, there are no known exploits in the wild currently reported.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is released, users should be cautious about the trust relationships configured in the system-wide certificate store and consider limiting the certificate authorities trusted by RouterOS services if possible.
CVE-2025-42611: CWE-295 Improper certificate validation in Mikrotik RouterOS
Description
RouterOS provides various services that rely on correct verification of client and server certificates to secure confidentiality and integrity of communications. This includes OpenVPN, CAPsMAN, Dot1x (802.1X), among others. The vulnerability lies in shared certificate validation logic which uses the system certificate store that is shared and equally trusted by all system services. This causes confusion of scope, allowing any certificate authority present in the system-wide trust store to be trusted in any context (with some exceptions), allowing partial or full authentication bypass in CAPsMAN, OpenVPN, Dot1X and potentially others.
CVSS v3.1
Score 6.5medium
Affected software
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
Mikrotik RouterOS contains a vulnerability (CVE-2025-42611) due to improper certificate validation (CWE-295). The system uses a shared certificate store for multiple services including OpenVPN, CAPsMAN, and Dot1X, which causes scope confusion in trust validation. This allows any certificate authority present in the system-wide trust store to be trusted in contexts where it should not be, potentially enabling partial or full authentication bypass in affected services. The vulnerability has a CVSS 3.1 base score of 6.5, indicating medium severity. No patch or official remediation level has been published as of the data provided.
Potential Impact
The vulnerability can lead to partial or full authentication bypass in several RouterOS services that rely on certificate validation, including CAPsMAN, OpenVPN, and Dot1X. This undermines the confidentiality and integrity of communications secured by these services. However, there are no known exploits in the wild currently reported.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is released, users should be cautious about the trust relationships configured in the system-wide certificate store and consider limiting the certificate authorities trusted by RouterOS services if possible.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- ENISA
- Date Reserved
- 2025-04-16T12:34:02.865Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 69f9d2e5cbff5d8610f0c7fb
Added to database: 5/5/2026, 11:22:13 AM
Last enriched: 5/5/2026, 11:36:21 AM
Last updated: 6/18/2026, 3:15:19 PM
Views: 123
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