CVE-2026-16347Improper restriction of excessive authentication attempts in MikroTik RouterOS and Cloud Hosted Router
Updated under an hour ago ()
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It affects MikroTik RouterOS and 1 other product. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
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MikroTik RouterOS contains a weakness in its API authentication handling that lacks effective safeguards against excessive login attempts. The system does not enforce meaningful rate-limiting, account lockout, or source-based restrictions, allowing repeated authentication failures to proceed without defensive response. In some versions, a fixed per-connection delay is present, but it can be bypassed through concurrent sessions, resulting in continued high-volume attempts. This deficiency increases the risk that an attacker could eventually obtain valid credentials and gain unauthorized access to administrative services.
- CVSS
- 8.8 HIGH (v3.1, CNA)CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- Weakness (CWE)
- CWE-307
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- icscert
- NVD analysis
- Deferred
- Record last updated
- Jul 29, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
MikroTik RouterOS mikrotik:routeros (from the name) | all versions | CNA record |
MikroTik Cloud Hosted Router mikrotik:cloud_hosted_router (from the name) | all versions | CNA record |
References
- https://www.cisa.gov/news-events/ics-advisories/icsa-26-209-05government-resource
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.