Out-of-bounds write in WECON PLC Editor
Priority LOW 36CWE-787Published · Updated
Key facts
- Attack vector
- Local
- Privileges required
- None
- User interaction
- Required
- Attack complexity
- Low
- Impact type
- Code execution
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- No fix listed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-787 and the CVSS impact.
Summary
PLC Editor Versions 1.3.8 and prior is vulnerable to an out-of-bounds write while processing project files, which may allow an attacker to execute arbitrary code.
Why it matters now
EPSS 0.0097 62nd percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| WECON | PLC Editor | All – 1.3.8 | — | No fix listed | CNA |
- PLC Editor VendorWECON Affected All – 1.3.8 Fixed in — No fix listed CNA
CPE configurations NVD · 1
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:we-con:plc_editor:*:*:*:*:*:*:*:* | up to 1.3.8 | Vulnerable | WECON Technology Co., Ltd. |
- cpe:2.3:a:we-con:plc_editor:*:*:*:*:*:*:*:* Versions up to 1.3.8 Vulnerable ·WECON Technology Co., Ltd.
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2021-42707
- 2026-10-03 Alias added: GHSA-83cj-78f4-89p2
References
More WECON vulnerabilities
- TI-2016-05016 Stack-based buffer overflow in WECON LeviStudio allows remote attackers to execute arbitrary code via a crafted file. CVSS 3.0HIGH 7.8
- TI-2018-10648 Stack-based buffer overflow in WECON PI Studio HMI CVSS 3.1CRITICAL 9.8
- TI-2016-03902 Heap-based buffer overflow in WECON LeviStudio allows remote attackers to execute arbitrary code via a crafted file. CVSS 3.1HIGH 7.8
- TI-2021-05929 Stack-based buffer overflow in WECON LeviStudioU CVSS 3.1HIGH 7.8
- TI-2021-05938 Heap-based buffer overflow in WECON LeviStudioU CVSS 3.1HIGH 7.8
- TI-2018-10640 Out-of-bounds write in WECON PI Studio HMI CVSS 3.0HIGH 8.8
Sources
- CVE-2021-42707 · CVE Program
- CVE-2021-42707 · NVD
- FIRST EPSS
- GHSA-83cj-78f4-89p2 · GitHub Advisory Database · CC BY 4.0
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