EUVD-2026-72025
GHSA-6q2x-6fhj-r3w8
Severity by source
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Network-reachable pre-auth (AV:N/PR:N), no complexity or interaction (AC:L/UI:N), kernel buffer leak (C:L), kernel crash/restart (A:H), no integrity impact or scope change.
Primary rating from Vendor (CERT-PL).
CVSS VectorVendor: CERT-PL
Lifecycle Timeline
6DescriptionCVE.org
RouterOS accepts a "related" btest connection before the corresponding primary session has completed authentication. An unauthenticated client can use this state to start an IPv4 UDP test. With "random-data=false", the sender transmits an uninitialized tail from a kernel packet buffer. A separate unchecked, inverted packet-size interval causes unsigned integer underflow, anomalously large fragmented output, and can restart the RouterOS kernel.
This issue was fixed in versions: 6.49.21 (Lont-term), 7.23.4 (Lont-term) and 7.24.2 (Stable)
AnalysisAI
Remote unauthenticated exploitation of MikroTik RouterOS's Bandwidth Test (btest) service allows two distinct attacks: kernel memory disclosure and kernel crash/restart. The btest server accepts a 'related' secondary UDP connection before the primary TCP control session completes authentication, permitting a pre-auth attacker to drive the btest data path. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | No special configuration is required for the availability (kernel crash) attack: the Bandwidth Test server is enabled by default on RouterOS and listens on TCP port 2000, making any network-reachable RouterOS device exploitable by an unauthenticated remote attacker without any prior access or credentials. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 4.0 vector (AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:H, score 8.8) accurately characterizes the threat: trivially exploitable from any network without authentication, user interaction, or special prerequisites. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Upgrade RouterOS to 6.49.21 or later on the Long-term channel, 7.23.4 or later on the Long-term channel, or 7.24.2 or later on the Stable channel, per the MikroTik security advisory at mikrotik.com/supportsec/september-2026-vulnerability/. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, inventory all MikroTik RouterOS devices across your infrastructure and disable the btest service on any device where bandwidth testing is not operationally essential; if btest must remain enabled, immediately implement strict network-layer access controls restricting btest port traffic to trusted administrative hosts only. …
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External POC / Exploit Code
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