CVE-2026-9621

9.2 criticalEPSS 0.4%

Critical (9.2). EPSS 0.4% chance of exploitation in the next 30 days.

A denial-of-service security issue exists within RSLinx® Classic. The security issue stems from improper handling of a malformed packet. A crafted CIP packet can cause the RSLinx® Classic service to crash, requiring a restart of the service to recover

Severity

CVSS 4.0

9.2 critical

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:H

EPSS: 0.4% chance of exploitation in the next 30 days; higher than 37% of CVEs (scores of 2026-10-31)
CWE: CWE-190
Published: 2026-09-01
Modified: 2026-09-01
Record from: the NVD, synced 2026-10-19

References

https://www.rockwellautomation.com/en-us/trust-center/security-advisories/advisory.SD1794.html

Check your stack JSON