How severe is CVE-2025-9466?

CVE-2025-9466 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-2025-9466 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (43rd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-9466?

CVE-2025-9466 affects Rockwellautomation Armorstart Lt Firmware. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2025-9466?

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-2025-9466 have an EU (EUVD) identifier?

Yes. CVE-2025-9466 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-3435.

When was CVE-2025-9466 published?

CVE-2025-9466 was published on 2026-01-20 and last updated on 2026-06-17.

CVE-2025-9466

CVE-2025-9466 is a high-severity vulnerability in Rockwellautomation Armorstart Lt 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-400.

Key facts

Severity: High (CVSS 3.x base score 7.5)
CVSS v4: 8.7
EPSS exploit prediction: 1% (43rd percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-3435
Weakness: CWE-400
Affected product: Rockwellautomation Armorstart Lt Firmware
Published: 2026-01-20
Last modified: 2026-06-17

Description

A security issue exists within ArmorStart® LT that can result in a denial-of-service condition. During execution of the Achilles EtherNet/IP and CIP grammar tests, the device reboots unexpectedly, causing the Link State Monitor to go down for several seconds.

Frequently asked questions

What is CVE-2025-9466?: A security issue exists within ArmorStart® LT that can result in a denial-of-service condition. During execution of the Achilles EtherNet/IP and CIP grammar tests, the device reboots unexpectedly, causing the Link State Monitor to go down for several seconds.
How severe is CVE-2025-9466?: CVE-2025-9466 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-2025-9466 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (43rd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-9466?: CVE-2025-9466 affects Rockwellautomation Armorstart Lt Firmware. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2025-9466?: 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-2025-9466 have an EU (EUVD) identifier?: Yes. CVE-2025-9466 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-3435.
When was CVE-2025-9466 published?: CVE-2025-9466 was published on 2026-01-20 and last updated on 2026-06-17.

References

https://www.rockwellautomation.com/en-us/trust-center/security-advisories/advisory.SD1768.html

Affected products (1)

cpe:2.3:o:rockwellautomation:armorstart_lt_firmware:*:*:*:*:*:*:*:*

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