No exploitation reported

CVE-2021-32926

No exploitation reported by the sources we read.

Published2021-06-03
WeaknessCWE-300

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

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

Timeline

dates in UTC

2021-06-0313:15CVE publishedNVD

Observed activity

isMalicious corpus · updated 2026-10-23 18:48 UTC

Indicators tagged with this CVE, per day0 indicators over 7 days

Block these indicators

Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2021-32926?format=txt
CSV export: https://api.ismalicious.com/edl/cve/CVE-2021-32926?format=csv
TAXII collection of exploited CVEs
The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD

Rockwellautomation micro800 firmwareversion to verify

Branch	Affected	Fixed in	Source
—	all versions	no fix published	NVD

Rockwellautomation micrologix 1400 firmwareversion to verify

Branch	Affected	Fixed in	Source
21.0+	≥ 21.0	no fix published	NVD

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Vendor advisories

ICSA-21-145-02 CISA2 known affected
Rockwell Automation Micro800 and MicroLogix 1400
Micro800: All versions · MicroLogix 1400: Version 21 and later when Enhanced Password Security enabled

Full record on NVD

Fix

Mitigation from the vendor CISA ICSA-21-145-02 · 2 productsRockwell recommends confirming that setting and updating the password for the controller is done within a trusted network environment.
Mitigation from the vendor CISA ICSA-21-145-02 · 2 productsIf this vulnerability is successfully exploited, the password can be reset by performing a firmware flash on the controller. Firmware flashing will put the controller into the default state and the user program and data will be lost.
Mitigation from the vendor CISA ICSA-21-145-02 · 2 productsA 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.
Mitigation from the vendor CISA ICSA-21-145-02 · 2 productsUsers can refer to the Converged Plantwide Ethernet (CPwE) Design and Implementation Guide for best practices for deploying network segmentation and broader defense-in-depth strategies. Users can also refer to the Rockwell Automation System Security Design Guidelines on how to use Rockwell Automati…
Mitigation from the vendor CISA ICSA-21-145-02 · 2 productsFor more information see Rockwell Automation Security Advisory (login required).

Detection

Nuclei template: none so far
Exploit-DB: no entry
Proof-of-concept repositories: none listed

Sources

CISA-ADPSSVC decisionnone2026-06-04
OpenCVESSVC decisionnone—
CISA-ADPCVSS 3.15.92026-06-04
NVDCVSS 3.17.5read 2026-10-23
NVDCVSS 2.05read 2026-10-23
CNAweakness (CWE)CWE-300read 2026-10-23
FIRST EPSSEPSS score3.0 %2026-10-22

Technical details

CVSS v3 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Published: 2021-06-03
Last Modified: 2026-06-17
NVD status: Modified

Frequently asked questions

What is CVE-2021-32926?

Is CVE-2021-32926 actively exploited?

Active exploitation of CVE-2021-32926 has not been confirmed. Its EPSS score was 3.0% on 2026-10-22, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2021-32926?

CVE-2021-32926 has a CVSS v3 base score of 7.5 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

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