cbcvebase.
CVE-2018-10070
published 2018-04-16

CVE-2018-10070: A vulnerability in MikroTik Version 6.41.4 could allow an unauthenticated remote attacker to exhaust all available CPU and all available RAM by sending a…

PriorityP262high7.5CVSS 3.0
AVNACLPRNUINSUCNINAH
EXPLOIT
EPSS
12.99%
95.8th percentile
A vulnerability in MikroTik Version 6.41.4 could allow an unauthenticated remote attacker to exhaust all available CPU and all available RAM by sending a crafted FTP request on port 21 that begins with many '\0' characters, preventing the affected router from accepting new FTP connections. The router will reboot after 10 minutes, logging a "router was rebooted without proper shutdown" message.

Affected

1 ranges
VendorProductVersion rangeFixed in
mikrotikrouter_firmware——

Detection & IOCsextracted from sources · hover to see the quote

versionMikroTik 6.41.4↗
bytes↗
Multiple leading null bytes (\x00) sent to TCP port 21
  • →Alert on high-volume unauthenticated TCP connections to port 21 on MikroTik devices, especially sessions that send streams of null bytes (\x00) without valid FTP commands. ↗
  • →Monitor for rapid repeated connections (e.g., ~50 concurrent sessions within ~200 seconds) to TCP/21 from a single source IP against MikroTik devices, consistent with the PoC loop of 100 iterations with 2-second sleep. ↗
  • →Detect unexpected router reboots on MikroTik devices accompanied by the log message 'router was rebooted without proper shutdown', which may indicate successful exploitation of this DoS. ↗
  • →Correlate CPU and RAM exhaustion telemetry on MikroTik 6.41.4 devices with concurrent spikes in FTP (TCP/21) connection counts from unauthenticated sources. ↗
  • ·The vulnerability affects MikroTik version 6.41.4 and is noted as potentially affecting all versions; ensure FTP (TCP/21) is not exposed to untrusted networks on MikroTik devices. ↗

CVSS provenance

nvdv3.07.5HIGHCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
nvdv2.07.8HIGHAV:N/AC:L/Au:N/C:N/I:N/A:C
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