Is CVE-2019-6553 actively exploited?

No active exploitation of CVE-2019-6553 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2019-6553 be exploited remotely?

Yes. CVE-2019-6553 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2019-6553?

CVE-2019-6553 has a CVSS score of 9.8 (CRITICAL).

HOME VULNERABILITIESCVE-2019-6553

CRITICAL

CVE-2019-6553

CWE-121Published: April 4, 2019· Updated: Jun 17, 2026

9.8

CVSS v3.1

Official Description

A vulnerability was found in Rockwell Automation RSLinx Classic versions 4.10.00 and prior. An input validation issue in a .dll file of RSLinx Classic where the data in a Forward Open service request is passed to a fixed size buffer, allowing an attacker to exploit a stack-based buffer overflow condition.

NVD Source

Technical Analysis

CVE-2019-6553 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 9.8.