Security readout for executives and security teams
Plain-English summary
WECON LeviStudioU, an industrial software tool, has a heap buffer overflow in versions dated 2019-09-21 and earlier. Successful exploitation could let an attacker run code with high impact to confidentiality, integrity, and availability, but the published CVSS vector indicates user interaction is required.
Executive priority
Treat this as high priority if WECON LeviStudioU is used in OT or engineering environments. The business risk is workstation compromise that could affect industrial project integrity or availability. Urgency is lower if the product is absent or fully updated.
Technical view
CVE-2021-23157 is a CWE-122 heap-based buffer overflow in WECON LeviStudioU. The CVSS 3.1 vector is 7.8 high: local attack vector, low complexity, no privileges, user interaction required, unchanged scope, and high CIA impact.
Likely exposure
Exposure is most likely on engineering or operator workstations where WECON LeviStudioU 2019-09-21 or earlier is installed. The sources do not identify a network service exposure path.
Exploitation context
The source bundle does not cite active exploitation, and the CVE is not marked KEV. The CVSS vector indicates exploitation needs user interaction, so malicious files, projects, or local workflow abuse are plausible risks, but the exact trigger is not provided here.
Researcher notes
Evidence supports a high-impact memory corruption issue, but the provided bundle lacks trigger details, proof-of-concept status, and confirmed fixed version data. Avoid assuming internet exposure or active exploitation without additional cited evidence.
Mitigation direction
- Inventory workstations for WECON LeviStudioU installations and version dates.
- Check CISA and WECON guidance for fixed versions or vendor mitigations.
- Prioritize removal or upgrade of versions 2019-09-21 and earlier.
- Restrict use of untrusted LeviStudioU files until remediation is confirmed.
- Harden engineering workstations with least privilege and endpoint monitoring.
Validation and detection
- Confirm whether LeviStudioU is installed on OT engineering workstations.
- Record installed versions and compare against 2019-09-21 and earlier.
- Review CISA advisory ICSA-21-355-03 for vendor-specific remediation details.
- Check endpoint telemetry for unexpected LeviStudioU child processes or crashes.
- Document compensating controls where upgrades are not immediately possible.
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
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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-122: Exact CWE lookup
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Open ATT&CK lookupCVE-2021-23157 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://www.cisa.gov/uscert/ics/advisories/icsa-21-355-03CVE reference · x_refsource_MISC
- https://www.zerodayinitiative.com/advisories/ZDI-22-130/CVE reference · x_refsource_MISC
- https://www.zerodayinitiative.com/advisories/ZDI-22-132/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.