AUGUST 4, 2026
Live Feed
Back to database
Case File

CVE-2021-22659

HIGH · CVSS 8.6 EPSS 1.72% Public Exploit

Source: NVD + CISA KEV + EPSS (historical backfill) · Published 2021-03-25 · Last synced 2026-08-04

CyberRota Analysis

This is a high severity vulnerability with a CVSS score of 8.6. Public exploit code or proof-of-concept references have been detected in its references. It may be remotely exploitable. Exploitation may require the attacker to be authenticated. It may lead to a denial-of-service condition.

Public Exploit Signal

A public exploit, PoC, GitHub repository or Metasploit reference was detected for this CVE.

Detected Signals
exploit

Note: these links are listed for security research and verification purposes only.

CVE
CVE-2021-22659
Severity
HIGH
CVSS
8.6
EPSS
1.72%

Original NVD Description

Rockwell Automation MicroLogix 1400 Version 21.6 and below may allow a remote unauthenticated attacker to send a specially crafted Modbus packet allowing the attacker to retrieve or modify random values in the register. If successfully exploited, this may lead to a buffer overflow resulting in a denial-of-service condition. The FAULT LED will flash RED and communications may be lost. Recovery from denial-of-service condition requires the fault to be cleared by the user.

Related CVEs

Other vulnerabilities affecting the same vendor(s)