CVE Catalog

CVE-2017-17537

HighCVSS 7.5
Published: Updated: Translated: NVD NIST

Exploitation Probability (EPSS)

Elevated risk
1.62%

75th percentile - higher than 75% of all known CVEs

Summary

Vulnerability in MikroTik RouterBOARD versions v6.39.2 and v6.40.5 allows an unauthenticated remote attacker to cause a denial of service (DoS) by connecting to TCP port 53 and sending data starting with many null ('\0') characters. The issue is likely related to DNS handling.

Risk Assessment

The attack can lead to unavailability of network services on the device, disrupting network operations and potentially affecting business continuity.

Recommendation

It is recommended to upgrade the firmware to a version later than v6.40.5 that includes a fix for this vulnerability. As a temporary workaround, restrict access to TCP port 53 to trusted IP addresses only.

Related vulnerabilities

Original NVD description (English source)

MikroTik RouterBOARD v6.39.2 and v6.40.5 allows an unauthenticated remote attacker to cause a denial of service by connecting to TCP port 53 and sending data that begins with many '\0' characters, possibly related to DNS.

Vulnerability data from NVD (NIST) · CISA KEV · EPSS