CVE-2021-32926

mediumpriority · track · 31EPSS 0.030 · 87 %ileEUUS

grimoire priorityP3 · Track

Exploitable?

—

no known exploitation

Likely / severe?

2.98% (87th) EPSS

CVSS 5 · medium

Is it mine?

7 products

Check your exposure

Who says so?

4 sources

cnnvd · enisa_euvd · cisa_csaf_ot · nvd

EPSS · scored 2026-10-28

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

remediations

Vendor fix, mitigation, or workaround guidance, as published by each source.

No vendor fix yet; a mitigation is available.

MitigationMicro800cisa_csaf_ot
A comprehensive defense-in-depth strategy can reduce the risk of this vulnerability. To leverage the vulnerability, an unauthorized user would require access to the same network as the controller. Users should confirm they are employing proper networking segmentation and security controls.
MitigationMicroLogix 1400cisa_csaf_ot
A comprehensive defense-in-depth strategy can reduce the risk of this vulnerability. To leverage the vulnerability, an unauthorized user would require access to the same network as the controller. Users should confirm they are employing proper networking segmentation and security controls.

cvss

Technical severity, 0–10. One row per scoring source.

7.5

010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · medium–high · 5–7.5

v2.05mediumAV:N/AC:L/Au:N/C:N/I:N/A:Pprimary · NVD / NIST USexploitability 10 · impact 2.9

v3.17.5highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:Hprimary · NVD / NIST USexploitability 3.9 · impact 3.6

v3.06.1mediumCVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:C/C:N/I:N/A:Hsecondary · CISA US

v3.15.9mediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:Hsecondary · ENISA EU

v3.15.9mediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:Hsecondaryexploitability 2.2 · impact 3.6

v3.16.9mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:Usecondary · CVSS-BT (t0sche)

ssvc

A stakeholder decision — act, attend, or track — from exploitation and impact.

Trackcoordinatorcisa_ssvcUS

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-300USCWE-300US

affected products (7)

Products and version ranges known to be affected.

Micro800: All versionsall versionscisa_csaf_otUS
MicroLogix 1400: Version 21 and later when Enhanced Password Security enabledall versionscisa_csaf_otUS
Rockwell Automation Micro800all versionscisa_csaf_otUS
Rockwell Automation MicroLogix 1400≥ 21cisa_csaf_otUS
n/a Micro800, MicroLogix 1400≤ Micro800: All versions, MicroLogix 1400: Version 21 and later when Enhanced Password Security enabled.enisa_euvdEU
rockwellautomation micro800 firmwareall versionsnvdUScpe:2.3:o:rockwellautomation:micro800_firmware:*:*:*:*:*:*:*:*
rockwellautomation micrologix 1400 firmware≥ 21.0nvdUScpe:2.3:o:rockwellautomation:micrologix_1400_firmware:*:*:*:*:*:*:*:*

advisories (1)

Vendor and ecosystem advisories describing this.

ICSA-21-145-02Rockwell Automation Micro800 and MicroLogix 14002021-05-25icsa · cisa_csaf_otUS
Successful exploitation of this vulnerability may result in denial-of-service conditions, which may require a firmware flash to recover.

also known as (3)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd cisa_csaf_ot nvd NVD CVE.org MITRE

published 2021-06-03modified 2026-06-17

references (6)

External citations — patches, advisories, analysis.

scry

Attackers weaponise vulnerabilities like this against internet-exposed services. See what is exposed on your perimeter with a free passive scan.

Free scan