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Vulnerability record · CVE-2021-32926 · published 3 June 2021

CVE-2021-32926: Rockwellautomation micro800 firmware vulnerability

Rockwellautomation · Micro800 Firmware

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

7.5 CVSS 3.1 High EPSS 3.0% · top 13.2% CWE-300 · CWE-300
7.5CVSS 3.1 base score, v2 5.0
3.0%EPSS exploitation probability, 30 days
NoNot in CISA KEV
2Affected product versions listed by NVD
2References
17 Jun 2026Last modified by NVD

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

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected products

2 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://us-cert.cisa.gov/ics/advisories/icsa-21-145-02 Third Party AdvisoryUS Government Resource
https://us-cert.cisa.gov/ics/advisories/icsa-21-145-02 Third Party AdvisoryUS Government Resource

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

9.8CVE-2015-6490Rockwellautomation micrologix 1100 firmware memory buffer overflow vulnerabilityStack-based buffer overflow on Allen-Bradley MicroLogix 1100 devices before B FRN 15.000 and 1400 devices through B FRN 15.003 allows remote attacker…EPSS 7.0%8.6CVE-2021-22659Rockwellautomation micrologix 1400 firmware classic buffer overflow vulnerabilityRockwell Automation MicroLogix 1400 Version 21.6 and below may allow a remote unauthenticated attacker to send a specially crafted Modbus packet allo…EPSS 1.7%8.6CVE-2018-17924Rockwellautomation micrologix 1400 firmware missing authentication for critical function vulnerabilityRockwell Automation MicroLogix 1400 Controllers and 1756 ControlLogix Communications Modules An unauthenticated, remote threat actor could send a CIP…EPSS 4.3%7.5CVE-2022-3166Rockwellautomation micrologix 1100 firmware vulnerabilityRockwell Automation was made aware that the webservers of the Micrologix 1100 and 1400 controllers contain a vulnerability that may lead to a denial-…EPSS 0.70%7.5CVE-2015-6492Rockwellautomation micrologix 1100 firmware memory buffer overflow vulnerabilityAllen-Bradley MicroLogix 1100 devices before B FRN 15.000 and 1400 devices before B FRN 15.003 allow remote attackers to cause a denial of service (m…EPSS 4.5%6.5CVE-2022-2179Rockwellautomation micrologix 1100 firmware clickjacking vulnerabilityThe X-Frame-Options header in Rockwell Automation MicroLogix 1100/1400 Versions 21.007 and prior is not configured in the HTTP response, which could …EPSS 1.2%6.5CVE-2015-6486Rockwellautomation micrologix 1100 firmware sql injection vulnerabilitySQL injection vulnerability on Allen-Bradley MicroLogix 1100 devices before B FRN 15.000 and 1400 devices before B FRN 15.003 allows remote authentic…EPSS 4.3%6.1CVE-2022-46670Rockwellautomation micrologix 1400 firmware cross-site scripting vulnerabilityRockwell Automation was made aware of a vulnerability by a security researcher from Georgia Institute of Technology that the MicroLogix 1100 and 1400…EPSS 0.56%

Source: NIST National Vulnerability Database (record CVE-2021-32926), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.