CVE-2025-42611

Improper certificate validation in multiple RouterOS services

At a glance

Severity: MEDIUM 6.5
EPSS: EPSS 0.19 % · percentile 8 (2026-10-27)
State: PUBLISHED
Published: 2026-05-05
Updated: 2026-05-05
Assigner: ENISA
NVD status: Awaiting Analysis

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.

Scores

Version	Score	Vector	Scored by
CVSS 3.1	MEDIUM 6.5	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N	ENISA
CVSS 3.1	MEDIUM 6.5	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N	NVD · a6d3dc9e-0591-4a13-bce7-0f5b31ff6158 (Secondary)

Weaknesses (CWE)

CWE-295

European references

ENISA EUVD · EUVD-2025-209639
GCVE · GCVE-0-2025-42611

Affected products

Product	Versions
Mikrotik · RouterOS	affected 0 ≤ 7.20.x

References

https://www.cert.si/en/cve-2025-42611/

Sources

Source	Licence
CVE List (CVEProject cvelistV5)	CVE Program Terms of Use
EPSS (FIRST.org)	FIRST — attribution requested
ENISA EUVD	ENISA — reproduction authorised, source acknowledged
NVD (NIST) via fkie-cad/nvd-json-data-feeds	Public domain — this product uses data from the NVD API but is not endorsed or certified by the NVD