MikroTik Router OS Directory Traversal Vulnerability
MikroTik RouterOS through 6.42 allows unauthenticated remote attackers to read arbitrary files and remote authenticated attackers to write arbitrary files due to a directory traversal vulnerability in the WinBox interface.
Severity = CVSS. Probability = EPSS (FIRST). Exploitation = public signals: KEV, EUVD, ransomware, EPSS above 10 %, no account required.
Exploitation probability EPSS · FIRST
Exploitation signals 4 / 5
- KEV catalog (CISA)01 Dec 2021
- Exploited in EUVD (ENISA)01 Dec 2021
- Used by ransomwareno
- EPSS above 10 %96.0%
- No account, over the networkyes
What to do
Fix
Apply the vendor’s fix as soon as it is available.
CISA guidance: Apply updates per vendor instructions.
Meanwhile
Take the service off the internet or restrict access to it, watch the logs and look for signs of compromise.
Manufacturers (CRA)
Exploited vulnerability in your product: early warning to ENISA within 24 h, then notification within 72 h (Article 14 of the Cyber Resilience Act). The CRA explained
Affected products
Open source packages OSV
Affected libraries according to OSV, with fixed versions.
Timeline
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Published
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Exploitation reported (ENISA)
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Added to the KEV catalog
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CISA remediation due date
-
EPSS peak: 96.1%
References
Other exploited vulnerabilities from the same vendor
- CVE-2026-67279Mikrotik RouterOS Improper Enforcement of Behavioral Workflow Vulnerability4.6 · Actively exploited
- CVE-2026-86060MikroTik RouterOS Improper Neutralization of Argument Delimiters in a Command Vulnerability5.7 · Actively exploited
- CVE-2026-67277MikroTik RouterOS Missing Authentication for Critical Function Vulnerability5.4 · Actively exploited
- CVE-2026-67276MikroTik RouterOS5.1 · Actively exploited
- CVE-2018-7445MikroTik RouterOS Stack-Based Buffer Overflow Vulnerability8.3 · Background exploitation