Security readout for executives and security teams
Plain-English summary
mySCADA myPRO before 8.20.0 could let unauthenticated network users view sensitive directory listings. This is primarily a confidentiality issue: exposed file names or contents may reveal operational, configuration, or system information useful to attackers. Because myPRO is SCADA software, prioritize internet-facing or remotely accessible deployments.
Executive priority
Treat this as a near-term remediation item for any SCADA environment using myPRO. It does not indicate system takeover by itself, but sensitive operational disclosure can support later attacks. Prioritize externally reachable systems first.
Technical view
CVE-2021-27505 is CWE-548 in mySCADA myPRO before 8.20.0. The CVSS 3.1 vector indicates network access, low complexity, no privileges, no user interaction, and high confidentiality impact, with no stated integrity or availability impact.
Likely exposure
Organizations running mySCADA myPRO versions prior to 8.20.0 are potentially exposed, especially if the web interface is reachable from untrusted networks. The source bundle does not provide exact affected subversions, CPEs, or deployment prerequisites beyond versions before 8.20.0.
Exploitation context
The provided data does not show CISA KEV listing or active exploitation evidence. The vulnerability is remotely reachable and unauthenticated per CVSS, so exposed instances should be treated as high-priority information disclosure risk even without confirmed exploitation.
Researcher notes
The public bundle identifies the weakness class, affected product, fixed version threshold, and CVSS vector, but not exact vulnerable directories, affected subversions, or exploit observations. Avoid assuming broader mySCADA products are affected without vendor confirmation.
Mitigation direction
- Upgrade mySCADA myPRO to version 8.20.0 or later.
- Review CISA and mySCADA guidance for any deployment-specific instructions.
- Restrict myPRO access to trusted networks and authenticated administrative paths.
- Remove direct internet exposure where operationally feasible.
- Monitor vendor advisories for any later affected-version clarification.
Validation and detection
- Inventory all mySCADA myPRO deployments and record exact versions.
- Confirm no production instance runs a version earlier than 8.20.0.
- Check whether myPRO interfaces are reachable from untrusted networks.
- Verify directory listings are not exposed to unauthenticated users.
- Review access logs for unusual unauthenticated file enumeration patterns.
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-548: 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-2021-27505 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
- 7.5 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/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:H/I:N/A:N3.93.6Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
7.5HighVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Source materials
- CVE List V5 sourceCVE List V5
- https://www.cisa.gov/uscert/ics/advisories/icsa-21-217-03CVE reference · x_refsource_MISC
- https://www.myscada.org/version-8-20-0-released-security-updateCVE 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.
Exposure of Information Through Directory Listing
Exposure of Information Through Directory Listing represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.