Resource exhaustion in MELSEC-Q QJ71E71-100 - CVE-2019-10977
Published: May 21, 2019
Vulnerability identifier: #VU18546
CSH Severity: Medium
CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2019-10977
CWE-ID: CWE-400
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.
The vulnerability exists due to improper input validation within FTP server implementation. A remote attacker can send specially crafted TCP packets to the FTP service, force the device to enter an error mode and perform a denial of service (DoS) attack. Physical reset of the PLC is required to regain device functionality.
Affected software
MELSEC-Q QJ71E71-100
How to mitigate CVE-2019-10977
Install updates from vendor's website.
MELSEC-Q QJ71E71-100 - update to 20122