Security readout for executives and security teams
Plain-English summary
CVE-2019-9011 allows an unauthenticated network attacker to identify valid usernames in Pilz PMC programming tool 3.x before 3.5.17. This is not a system-takeover issue by itself, but it can lower the barrier for targeted credential attacks against industrial engineering environments.
Executive priority
Treat this as a moderate industrial security hygiene issue. It should be remediated during normal vulnerability management cycles, faster if engineering systems are broadly reachable or credential attacks are already a concern.
Technical view
The CVE describes username enumeration in Pilz PMC programming tool 3.x before 3.5.17, based on CODESYS Development System. CVSS 3.1 rates it 5.3: network reachable, low complexity, no privileges, no user interaction, with low confidentiality impact and no stated integrity or availability impact.
Likely exposure
Exposure is most likely in organizations using Pilz PMC 3.x engineering software, especially where programming workstations or related services are reachable on internal networks. The source bundle does not provide CPEs or broader affected-product details.
Exploitation context
The CVE is not listed as CISA KEV, and the provided sources do not state active exploitation. The risk is credential-discovery support: attackers may use valid usernames to focus phishing, password attacks, or follow-on access attempts.
Researcher notes
Evidence is sparse in the provided bundle: no CPEs, exploit details, or confirmed exploitation are listed. The strongest technical facts are the affected version range, username-identification impact, CWE-668 mapping, and CVSS vector.
Mitigation direction
- Upgrade Pilz PMC programming tool 3.x to 3.5.17 or vendor-recommended later guidance.
- Restrict network access to engineering tools and workstations to trusted administrative paths.
- Review vendor advisory VDE-2021-061 for product-specific remediation details.
- Monitor authentication logs for unusual username probing or repeated failed logins.
Validation and detection
- Inventory Pilz PMC programming tool installations and record exact versions.
- Confirm no 3.x installation remains below version 3.5.17.
- Check whether engineering tool interfaces are reachable from untrusted network segments.
- Review authentication telemetry for enumeration-like patterns before and after remediation.
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-668: 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 lookupCVE-2019-9011 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
- 5.3 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
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:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N3.91.4Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
5.3MediumVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Source materials
- CVE List V5 sourceCVE List V5
- https://cert.vde.com/en/advisories/VDE-2021-061/CVE reference
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.
Exposure of Resource to Wrong Sphere
Exposure of Resource to Wrong Sphere represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.