Security readout for executives and security teams
Plain-English summary
A malicious project file could cause Phoenix Contact engineering software to place files outside the chosen project folder, potentially affecting workstation files. The attacker must get someone to handle the manipulated project file; this is not described as a remote, no-click issue.
Executive priority
Treat this as a high-priority workstation exposure for OT engineering environments, not as an internet-wide emergency based on the provided evidence. Prioritize inventory, vendor guidance, and controls around project-file exchange.
Technical view
CVE-2021-34597 is CWE-20 improper input validation in Phoenix Contact PC Worx Automation Suite up to version 1.88, including PC Worx and PC Worx-Express. A manipulated project file can unpack arbitrary files outside the selected project directory. CVSS 3.1 is 7.8 with local access and required user interaction.
Likely exposure
Exposure is most likely on engineering workstations using PC Worx or PC Worx-Express up to version 1.88, especially where project files arrive from contractors, email, shared drives, or backups. The provided sources do not identify cloud services, controllers, or other Phoenix Contact products as affected.
Exploitation context
The source bundle does not show CISA KEV listing or active exploitation evidence. Practical risk depends on whether attackers can deliver a manipulated PC Worx project file to an engineer or operator and persuade them to open or unpack it.
Researcher notes
Evidence is limited to the CVE record, CVE List entry, and Phoenix Contact/VDE advisory reference. The affected condition is project-file unpacking path escape behavior. No exploit code, exploitation campaign, or non-Phoenix-Contact affected products are supported by the supplied sources.
Mitigation direction
- Inventory PC Worx and PC Worx-Express installations and versions.
- Check Phoenix Contact or VDE guidance for fixed versions or vendor remediation.
- Do not open PC Worx project files from untrusted or unverified sources.
- Handle contractor project files through a controlled review and scanning process.
- Limit engineering workstation access to trusted users and trusted file shares.
Validation and detection
- Confirm whether any installation is PC Worx Automation Suite version 1.88 or earlier.
- Review engineering workflows for externally supplied PC Worx project files.
- Check endpoint logs for unexpected file creation during project import or unpacking.
- Verify users know to reject unsolicited or unexpected project files.
- Track Phoenix Contact advisory VDE-2021-052 for authoritative remediation details.
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-20: Exact CWE lookup
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Open ATT&CK lookupCVE-2021-34597 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://cert.vde.com/en/advisories/VDE-2021-052/CVE reference · x_refsource_CONFIRM
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.