CVE Watch14 sept 2026

CVE-2026-89020

MikroTik RouterOS before 7.23.4 (long-term) and 7.24.2 (stable) contains a stack-based buffer overflow vulnerability in the mtget binary's T

CVSS

4.3

Medio

EPSS

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KEV

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Exploit Today

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0-100

Publicado: 14 sept 2026 · Última mod.: 14 sept 2026 · CWE-121

EPSS · 30d

Sin historial EPSS suficiente todavía.

Descripción técnica

MikroTik RouterOS before 7.23.4 (long-term) and 7.24.2 (stable) contains a stack-based buffer overflow vulnerability in the mtget binary's TFTP RRQ builder function that allows authenticated users to crash the mtget worker process by supplying a URL path of 507 bytes or more to the /tool fetch command; the first write outside the 528-byte buffer occurs at 505 bytes. Attackers can trigger the overflow by issuing a fetch command with a crafted tftp:// URL path, which causes an unbounded rep movsb instruction to overwrite saved registers at a deterministic offset, crashing the process without requiring a reachable TFTP server or elevated privileges beyond read-only group membership.

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