Security readout for executives and security teams
Plain-English summary
FATEK WinProladder engineering workstations could be compromised if a user opens a malicious project file. The issue is a memory corruption flaw that may allow arbitrary code execution. Business risk centers on engineering PCs, automation project integrity, and potential downstream operational disruption.
Executive priority
Treat this as a high-priority engineering workstation risk, not a broad internet-exposed service issue. Prioritize sites using FATEK tooling and environments where third-party project files are routinely exchanged.
Technical view
CVE-2021-43554 is a CWE-787 out-of-bounds write in FATEK WinProladder versions 3.30_24518 and prior while processing project files. CVSS 3.1 is 7.8, with local attack vector and required user interaction, but no privileges required and high confidentiality, integrity, and availability impact.
Likely exposure
Organizations using FATEK WinProladder to create or maintain automation projects are the likely exposure group, especially where project files arrive by email, shared drives, vendors, integrators, or removable media.
Exploitation context
The bundle does not show CISA KEV listing or cited evidence of active exploitation. Exploitation requires convincing a user to open a crafted project file in an affected WinProladder version.
Researcher notes
Focus validation on affected WinProladder versions and project-file parsing paths. The public bundle supports arbitrary code execution potential but does not provide patch details or active exploitation evidence.
Mitigation direction
- Inventory WinProladder installations and versions on engineering workstations.
- Check FATEK and CISA guidance for supported updates or mitigations.
- Do not open untrusted WinProladder project files.
- Restrict project-file exchange to trusted channels and verified sources.
- Harden and monitor engineering workstations handling automation projects.
Validation and detection
- Confirm whether WinProladder version 3.30_24518 or earlier is installed.
- Review file-handling workflows for project files from external parties.
- Check endpoint telemetry for suspicious activity around WinProladder launches.
- Verify users know not to open unexpected automation project files.
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
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-787: Exact CWE lookup
Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupExecution behavior lookup
The CVE wording references code or command execution, so execution technique review may help defensive triage. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2021-43554 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
- High
- CVSS
- 7.8 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/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.
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:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H1.85.9Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
7.8HighVector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Source materials
- CVE List V5 sourceCVE List V5
- https://us-cert.cisa.gov/ics/advisories/icsa-21-320-01CVE reference · x_refsource_MISC
- https://www.zerodayinitiative.com/advisories/ZDI-22-030/CVE reference · x_refsource_MISC
- https://www.zerodayinitiative.com/advisories/ZDI-22-033/CVE reference · x_refsource_MISC
- https://www.zerodayinitiative.com/advisories/ZDI-22-028/CVE reference · 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.
Out-of-bounds Write
Out-of-bounds Write represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.