How severe is CVE-2025-9166?

CVE-2025-9166 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2025-9166 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (31st percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-9166?

CVE-2025-9166 affects Rockwellautomation Controllogix 5580 Firmware. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2025-9166?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2025-9166 have an EU (EUVD) identifier?

Yes. CVE-2025-9166 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-27252.

When was CVE-2025-9166 published?

CVE-2025-9166 was published on 2025-09-09 and last updated on 2026-06-17.

CVE-2025-9166

CVE-2025-9166 is a high-severity vulnerability in Rockwellautomation Controllogix 5580 Firmware with a CVSS 3.x base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-476.

Key facts

Severity: High (CVSS 3.x base score 7.5)
CVSS v4: 8.2
EPSS exploit prediction: 0% (31st percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-27252
Weakness: CWE-476
Affected product: Rockwellautomation Controllogix 5580 Firmware
Published: 2025-09-09
Last modified: 2026-06-17

Description

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.

Frequently asked questions

What is CVE-2025-9166?: 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 severe is CVE-2025-9166?: CVE-2025-9166 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2025-9166 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (31st percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-9166?: CVE-2025-9166 affects Rockwellautomation Controllogix 5580 Firmware. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2025-9166?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2025-9166 have an EU (EUVD) identifier?: Yes. CVE-2025-9166 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-27252.
When was CVE-2025-9166 published?: CVE-2025-9166 was published on 2025-09-09 and last updated on 2026-06-17.

References

https://www.rockwellautomation.com/en-us/trust-center/security-advisories/advisory.SD1747.html

Affected products (1)

cpe:2.3:o:rockwellautomation:controllogix_5580_firmware:35.013:*:*:*:*:*:*:*

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Other CWE-476 (NULL Pointer Dereference) vulnerabilities

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CVE-2026-31657 — Critical (CVSS 9.8): In the Linux kernel, the following vulnerability has been resolved: batman-adv: hold claim backbone gateways by…
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