CVE-2021-42705
CVE-2021-42705 is a high-severity vulnerability in We-con Plc Editor with a CVSS 3.x base score of 7.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-121.
Key facts
- Severity: High (CVSS 3.x base score 7.8)
- CVSS v2: 6.8
- EPSS exploit prediction: 1% (58th percentile)
- Actively exploited: Not listed in CISA KEV
- Weakness: CWE-121
- Affected product: We-con Plc Editor
- Published:
- Last modified:
Description
PLC Editor Versions 1.3.8 and prior is vulnerable to a stack-based buffer overflow while processing project files, which may allow an attacker to execute arbitrary code.
Frequently asked questions
- What is CVE-2021-42705?
- PLC Editor Versions 1.3.8 and prior is vulnerable to a stack-based buffer overflow while processing project files, which may allow an attacker to execute arbitrary code.
- How severe is CVE-2021-42705?
- CVE-2021-42705 has a CVSS 3.x base score of 7.8, rated high severity. It is exploitable over local access with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.
- Is CVE-2021-42705 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (58th percentile), an estimate of the probability of exploitation in the next 30 days.
- What products are affected by CVE-2021-42705?
- CVE-2021-42705 affects We-con Plc Editor. See the affected-products list for the exact vulnerable versions.
- How do I fix CVE-2021-42705?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
- When was CVE-2021-42705 published?
- CVE-2021-42705 was published on 2021-11-22 and last updated on 2026-06-17.
References
Affected products (1)
- cpe:2.3:a:we-con:plc_editor:*:*:*:*:*:*:*:*
More vulnerabilities in We-con Plc Editor
- CVE-2020-25181 — High (CVSS 8.8): WECON PLC Editor Versions 1.3.8 and prior has a heap-based buffer overflow vulnerabilities have been identified that…
- CVE-2020-25177 — High (CVSS 8.8): WECON PLC Editor Versions 1.3.8 and prior has a stack-based buffer overflow vulnerability has been identified that may…
- CVE-2021-42707 — High (CVSS 7.8): PLC Editor Versions 1.3.8 and prior is vulnerable to an out-of-bounds write while processing project files, which may…
- CVE-2019-18236 — High (CVSS 7.8): Multiple buffer overflow vulnerabilities exist when the PLC Editor Version 1.3.5_20190129 processes project files. An…
- CVE-2018-14792 — Medium (CVSS 6.3): WECON PLC Editor version 1.3.3U may allow an attacker to execute code under the current process when processing project…
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