CVE-2026-12659
View CSAF Summary Successful exploitation of this vulnerability could allow an attacker to cause a denial-of-service condition on the affected product. The following versions of Rockwell Automation Flex 5000 Adapter are affected: Flex 5000 Adapter 6.011 (CVE-2026-12659) CVSS Vendor Equipment Vulnerabilities v3 7.5 Rockwell Automation Rockwell Automation Flex 5000 Adapter Double Free Background Critical Infrastructure Sectors: Critical Manufacturing, Information Technology Countries/Areas Deployed: Worldwide Company Headquarters Location: United States Vulnerabilities Expand All + CVE-2026-12659 A denial-of-service security issue exists in the affected products. The security issue stems from improper handling of exceptional conditions when processing crafted CIP packets sent to the adapter. A power cycle is required to recover the module and associated I/O. View CVE Details Affected Products Rockwell Automation Flex 5000 Adapter Vendor: Rockwell Automation Product Version: Rockwell Automation Flex 5000 Adapter: 6.011 Product Status: known_affected Remediations Vendor fix Rockwell Automation recommends users to upgrade to the following: Flex 5000 Adapter version 6.012. Mitigation Customers using the affected software, who are not able to upgrade to one of the corrected versions, should use Rockwell Automation's security best practices (https://support.rockwellautomation.com/app/answers/answer_view/a_id/1085012/loc/en_US#__highlight). https://support.rockwellautomation.com/app/answers/answer_view/a_id/1085012/loc/en_US#__highlight Mitigation For more information, see Rockwell Automation Security Advisory SD1789 (https://www.rockwellautomation.com/en-us/trust-center/security-advisories/advisory.SD1789.html). https://www.rockwellautomation.com/en-us/trust-center/security-advisories/advisory.SD1789.html Relevant CWE: CWE-415 Double Free Metrics CVSS Version Base Score Base Severity Vector String 3.1 7.5 HIGH CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H 4.0 8.7 HIGH CVSS:4
CSIRTS triage
- What
- A denial-of-service security issue exists in the affected products.
- Who is affected
- Deployments of Flex 5000 Adapter version 6.011.
- Urgency
- Remediation is urgent due to the critical nature of the vulnerability and the potential for service disruption.
- Action
- A power cycle is required to recover the module and associated I/O.
AI-assisted analysis generated from the source advisory — verify against the original.
⚡ Watch CVE-2026-12659
Get an email if CVE-2026-12659 is added to CISA KEV, gains public exploit code, or a new advisory cites it — max one per day, one-click unsubscribe.
Exploitation outlook
- Low exploitation risk0.32% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 24% of all EPSS-scored CVEs.
Advisory coverage (2)
- criticalRockwell Automation Flex 5000 Adaptercisa · 2026-07-16
- unknownCVE-2026-12659: A denial-of-service security issue exists in the affected products. The security issue stems f…nvd · 2026-07-14
External references
Embed the live status
— this badge updates automatically when the KEV or exploit status changes. How to embed it →
[](https://www.csirts.com/cve/CVE-2026-12659)