CVE-2025-9166: A denial-of-service security issue exists in the affected product and version

This month

HIGH 7.5REMOTEMITIGATE

CVE-2025-9166 is a high-severity flaw (CVSS 7.5) affecting controllogix 5580 firmware. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A denial-of-service security issue exists in the affected product and version. The security issue stems from the controller repeatedly attempting to forward messages. The issue could result in a major nonrecoverable fault on the controller.

Why this priority

High severity
Remotely exploitable, no login, no user action

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.4% (top 62%)
CISA exploited list	No
Weakness	CWE-476
Published	2025-09-09
Last modified	2026-10-01

Publisher (CNA): Rockwell Automation · Vendor: rockwellautomation

Last updated 2026-10-01 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2025-09-09 13:15 UTCPublished CVE record published
2026-10-01 16:10 UTCUpdated Record last modified

rockwellautomation controllogix 5580 firmware MITIGATE

Affected: 35.013

Fixed in: no fixed release known

Safe to downgrade to: a release before 35.013

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2025-9166?

controllogix 5580 firmware: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2025-9166 being exploited?

CVE-2025-9166 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2025-9166 affect?

CVE-2025-9166 affects controllogix 5580 firmware. Severity is high (CVSS 7.5). A denial-of-service security issue exists in the affected product and version. The security issue stems from the controller repeatedly attempting to forward messages. The issue could result in a major nonrecoverable fault on the controller.

How urgent is CVE-2025-9166?

Priority 41/100. High severity; Remotely exploitable, no login, no user action

Related CVEs

CVE-2024-8626 HIGH 7.5 UPGRADE UPGRADE Due to a memory leak, a denial-of-service vulnerability exists in the Rockwell Automation affected products
CVE-2024-7515 HIGH 7.5 UPGRADE UPGRADE CVE-2024-7515 IMPACT A denial-of-service vulnerability exists in the affected products
CVE-2024-7507 MEDIUM 6.5 UPGRADE UPGRADE CVE-2024-7507 IMPACT A denial-of-service vulnerability exists in the affected products
CVE-2024-6207 HIGH 7.5 UPGRADE UPGRADE CVE 2021-22681 https://www.rockwellautomation.com/en-us/trust-center/security-advisories/advisory.PN1550.html
CVE-2024-5659 MEDIUM 6.5 MITIGATE MITIGATE Rockwell Automation was made aware of a vulnerability that causes all affected controllers on the same network

References

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