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CISA flags four flaws (CVE-2026-9621/9622/9624/9625) in Rockwell RSLinx Classic 4.50 and below that can cause denial-of-service conditions; CVSS 8.6.

CISA published an ICS advisory covering four vulnerabilities in Rockwell Automation RSLinx Classic versions 4.50 and below. The integer overflow, underflow, and classic buffer overflow flaws (CVE-2026-9621, CVE-2026-9622, CVE-2026-9624, CVE-2026-9625) could let attackers cause denial-of-service conditions. The product is deployed worldwide, primarily in critical manufacturing.

CISA AdvisoriesSep 1, 12:00 UTC · 15d agoAdvisory CVE-2026-9621 CVE-2026-9622 CVE-2026-9624+1 CVEs

Rockwell Automation security advisory (AV26-869)

Canada's Cyber Centre flags vulnerabilities across multiple Rockwell Automation ICS products including ControlLogix 5580 and RSLinx Classic.

Canadian Centre for Cyber Security advisory AV26-869, dated September 1, 2026, lists vulnerabilities in Rockwell Automation products: 1756-ENBT Module (all versions), ArmorStart LT (v2.001 and earlier), CompactLogix 5380 / ControlLogix 5580 (V33 and earlier plus several V34-V36 releases), and RSLinx Classic (V4.50 and earlier). It references Rockwell advisories SD1792, SD1794, SD1797, and SD1798 and urges users to apply updates as available.

Canadian Centre for Cyber SecuritySep 1, 18:45 UTC · 15d agoAdvisory