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CVE-2026-16347

HIGH
8.8
CVSS 3.1
Description
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.

Metadata

CVE ID
CVE-2026-16347
State
PUBLISHED
Assigner
icscert
Reserved
2026-07-20 20:41 UTC
Published
2026-07-28 19:59 UTC
Last updated
2026-07-28 19:59 UTC
Primary CWE
CWE-307
CWE-307 Improper restriction of excessive authentication att…
Vendor / Product
MikroTik / RouterOS
Sources
cve.org  ·  NVD

Severity & Metrics

8.8 HIGH CVSS 3.1
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Affected products (2)
VendorProductPlatformVersions
MikroTik Cloud Hosted Router — All versions
MikroTik RouterOS — All versions
Weakness (CWE)
CWESourceDescription
CWE-307 cna CWE-307 Improper restriction of excessive authentication attempts
CVSS scores (2)
ScoreSeverityVersionSourceVector
8.8 HIGH 3.1 cna CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
8.7 HIGH 4.0 cna CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
References (1)
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