EUVD-2026-77756
GHSA-66qh-8rrp-pqjv
Severity by source
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/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 command requires authenticated session (PR:L); impact is limited to crashing a single worker process (A:L); no confidentiality or integrity impact confirmed.
Primary rating from Vendor (VulnCheck).
CVSS VectorVendor: VulnCheck
Lifecycle Timeline
3DescriptionCVE.org
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.
AnalysisAI
Stack-based buffer overflow in MikroTik RouterOS's mtget binary TFTP RRQ builder allows any authenticated user, including those with only read-only group membership, to crash the mtget worker process by issuing a /tool fetch command with a crafted tftp:// URL path of 507 bytes or more. The overflow involves an unbounded rep movsb instruction that overwrites saved registers at a deterministic stack offset, causing a reproducible process crash without requiring network connectivity to an actual TFTP server. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires a valid authentication credential on the target RouterOS device; read-only group membership is sufficient, so the attacker does not need administrator or write privileges. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 4.0 score of 5.3 (Medium) with vector AV:N/AC:L/AT:N/PR:L/UI:N/VA:L accurately characterizes the constrained impact: network-reachable, low complexity, but requiring authentication and resulting only in a process-level availability impact. … 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 to RouterOS 7.23.4 or later on the long-term channel, or 7.24.2 or later on the stable channel, as detailed in the MikroTik security advisory at https://mikrotik.com/supportsec/september-2026-vulnerability. … Detailed patch versions, workarounds, and compensating controls in full report. |
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Same weakness CWE-121 – Stack-based Buffer Overflow
View allSame technique Buffer Overflow
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External POC / Exploit Code
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