Security readout for executives and security teams
Plain-English summary
This issue can lock users out of affected Micro800 and MicroLogix 1400 controllers during a password change. An attacker able to intercept the password-change message could replace the legitimate new password hash, causing a denial-of-service condition. The source bundle does not identify data theft, code execution, or active exploitation.
Executive priority
Treat this as a moderate operational availability risk for affected industrial sites. Prioritize asset identification and network exposure review over emergency response unless affected controllers are reachable from untrusted networks or password changes are occurring during maintenance windows.
Technical view
CVE-2021-32926 is a CWE-300 weakness affecting Micro800 all versions and MicroLogix 1400 version 21 and later when Enhanced Password Security is enabled. CVSS 3.1 is 5.9: network attack vector, high complexity, no privileges or user interaction, unchanged scope, availability impact only.
Likely exposure
Exposure is likely limited to environments running the named controllers, especially where controller management or password-change traffic is reachable over a network path an attacker could intercept. MicroLogix 1400 exposure depends on version 21 or later with Enhanced Password Security enabled.
Exploitation context
The bundle says exploitation requires intercepting an authenticated password-change request and replacing the password hash. CISA KEV status is false, and no provided source states active exploitation. The high attack complexity lowers urgency but does not remove operational risk in exposed ICS networks.
Researcher notes
The evidence supports a man-in-the-middle style integrity failure during password-change handling, resulting in availability loss. The bundle does not provide patch details, exploit maturity, proof-of-concept availability, or broader affected product claims, so validation should stay tightly scoped to the named controllers and configurations.
Mitigation direction
- Identify Micro800 and MicroLogix 1400 controllers in the environment.
- Confirm MicroLogix 1400 version and Enhanced Password Security status.
- Review the CISA ICS advisory and vendor guidance for supported fixes.
- Restrict controller management access to trusted network paths only.
- Plan password changes from controlled networks with monitoring enabled.
Validation and detection
- Inventory controllers by model, firmware version, and security configuration.
- Review network paths that can reach controller password-change functions.
- Check logs or monitoring for failed authentication after password changes.
- Confirm remediation guidance against the cited CISA advisory before rollout.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
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CWE-300: Exact CWE lookup
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Open ATT&CK lookupCredential and access behavior lookup
The CVE wording references authentication or credential exposure, so valid-account and credential-access review may help. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2021-32926 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Medium
- CVSS
- 5.9 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
SSVC decision data
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H2.23.6CISA-ADPVulnerability scoring details
Base CVSS 3.1 score
5.9MediumVector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
Vulnerability timeline
Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.
- CVE reservedCVE Program
The CVE ID was reserved by the assigning CNA.
- CVE publishedCVE Program
The CVE record was published.
- CVE updatedCVE Program
The CVE record metadata indicates this as the latest update time.
ADP provider summaries
Source materials
- CVE List V5 sourceCVE List V5
- https://us-cert.cisa.gov/ics/advisories/icsa-21-145-02CVE reference, icscert · x_refsource_MISC
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Channel Accessible by Non-Endpoint
Channel Accessible by Non-Endpoint represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.