CVE-2017-17537

HIGH

MikroTik RouterBOARD 6.39.2 and 6.40.5 - Unauthenticated Denial of Service via TCP Port 53

Title source: llm
STIX 2.1

Exploitation Summary

EIP tracks 1 public exploit for CVE-2017-17537. PoCs published by Mr Bruce.

AI-analyzed exploit summary This exploit sends a malformed HTTP POST request with an oversized 'username' parameter to trigger a buffer overflow vulnerability. It targets a web server's login endpoint, likely causing a denial-of-service or potential remote code execution if the overflow is exploitable.

Description

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.

Exploits (1)

exploitdb WORKING POC
by Mr Bruce · pythondoswindows
https://www.exploit-db.com/exploits/43200

This exploit sends a malformed HTTP POST request with an oversized 'username' parameter to trigger a buffer overflow vulnerability. It targets a web server's login endpoint, likely causing a denial-of-service or potential remote code execution if the overflow is exploitable.

Classification
Working Poc 90%
Attack Type
Dos
Complexity
Trivial
Reliability
Theoretical
Target: Unknown web server (likely a custom or outdated application)
No auth needed
Prerequisites: Network access to the target server · Vulnerable web application with a buffer overflow in the login endpoint
devstral-2 · analyzed Feb 16, 2026 Full analysis →

References (1)

Core 1
Core References
Broken Link, Third Party Advisory, VDB Entry exploit x_refsource_exploit-db
https://www.exploit-db.com/exploits/43200/

Scores

CVSS v3 7.5
EPSS 0.0162
EPSS Percentile 72.9%
Attack Vector NETWORK
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Details

CWE
CWE-20
Status published
Products (2)
mikrotik/routerboard 6.39.2
mikrotik/routerboard 6.40.5
Published Dec 13, 2017
Tracked Since Feb 18, 2026