How severe is CVE-2021-32926?

CVE-2021-32926 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-2021-32926 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (80th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-32926?

CVE-2021-32926 primarily affects Rockwellautomation Micro800 Firmware. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2021-32926?

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.

When was CVE-2021-32926 published?

CVE-2021-32926 was published on 2021-06-03 and last updated on 2026-06-17.

CVE-2021-32926

CVE-2021-32926 is a high-severity vulnerability in Rockwellautomation Micro800 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-300.

Key facts

Severity: High (CVSS 3.x base score 7.5)
CVSS v2: 5.0
EPSS exploit prediction: 2% (80th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-300
Affected product: Rockwellautomation Micro800 Firmware
Published: 2021-06-03
Last modified: 2026-06-17

Description

When an authenticated password change request takes place, this vulnerability could allow the attacker to intercept the message that includes the legitimate, new password hash and replace it with an illegitimate hash. The user would no longer be able to authenticate to the controller (Micro800: All versions, MicroLogix 1400: Version 21 and later) causing a denial-of-service condition

Frequently asked questions

What is CVE-2021-32926?: When an authenticated password change request takes place, this vulnerability could allow the attacker to intercept the message that includes the legitimate, new password hash and replace it with an illegitimate hash. The user would no longer be able to authenticate to the controller (Micro800: All versions, MicroLogix 1400: Version 21 and later) causing a denial-of-service condition
How severe is CVE-2021-32926?: CVE-2021-32926 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-2021-32926 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (80th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-32926?: CVE-2021-32926 primarily affects Rockwellautomation Micro800 Firmware. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2021-32926?: 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.
When was CVE-2021-32926 published?: CVE-2021-32926 was published on 2021-06-03 and last updated on 2026-06-17.

References

https://us-cert.cisa.gov/ics/advisories/icsa-21-145-02

Affected products (2)

cpe:2.3:o:rockwellautomation:micro800_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:rockwellautomation:micrologix_1400_firmware:*:*:*:*:*:*:*:*

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