MikroTik RouterOS through 6.42 allows unauthenticated remote attackers to read arbitrary files and remote authenticated attackers to write a

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

• mikrotik routerosup to 6.42 inclusive

Other highest-scoring records for the same primary product.

• CVE-2018-7445A buffer overflow was found in the MikroTik RouterOS SMB service when processing NetBIOS session request messages.KEV
  87Now
• CVE-2026-86060SSH session privilege manipulation via a crafted username in Mikrotik RouterOSKEV
  67This week
• CVE-2026-67277Kernel memory disclosure and denial of service in MikroTik RouterOS btest serviceKEV
  65This week
• CVE-2026-67279SSH Pre-Authentication Rekey State Bypass in MikroTik RouterOSKEV
  57Plan
• CVE-2017-20149The Mikrotik RouterOS web server allows memory corruption in releases before Stable 6.38.5 and Long-term 6.37.5, aka Chimay-Red.
  40Plan
• CVE-2022-45315Mikrotik RouterOs before stable v7.6 was discovered to contain an out-of-bounds read in the snmp process.
  39Monitor

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Root cause

A user-supplied file name is joined with the allowed directory, but the result is never checked to confirm it is still inside that directory.

A representative example of this vulnerability class. Not the vendor's source code; it shows the faulty pattern and its fix.

1const file = path.join(ROOT, req.query.name);2res.sendFile(file);

1const file = path.resolve(ROOT, req.query.name);2if (!file.startsWith(ROOT + path.sep)) {3  return res.sendStatus(400);4}5res.sendFile(file);

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.