CVE-2021-42707: PLC Editor Versions 1.3.8 and prior is vulnerable to an out-of-bounds write while processing project files, wh

Q: How do I fix CVE-2021-42707?

plc editor: upgrade to newer than 1.3.8. Exact commands for each OS are on this page.

Q: Is CVE-2021-42707 being exploited?

CVE-2021-42707 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2021-42707 affect?

CVE-2021-42707 affects plc editor. Severity is 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 allow an attacker to execute arbitrary code.

This month

HIGH 7.8UPGRADE

CVE-2021-42707 is a high-severity flaw (CVSS 7.8) affecting plc editor. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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 this priority

High severity

A fixed release or distro patch exists.

Risk facts

CVSS score	7.8 (High)
Attack vector	Local
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	1.0% (top 38%)
CISA exploited list	No
Weakness	CWE-787
Published	2021-11-22
Last modified	2026-06-17

Publisher (CNA): ICS-CERT · Vendor: we-con

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2021-11-22 20:15 UTCPublished CVE record published
2026-06-17 04:09 UTCUpdated Record last modified

we-con plc editor UPGRADE

Affected: <= 1.3.8

Fixed in: newer than 1.3.8

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy plc-editor || rpm -q plc-editor || plc-editor --version

2. UPGRADE to newer than 1.3.8 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade plc-editor

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade plc-editor

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2021-42707?

plc editor: upgrade to newer than 1.3.8. Exact commands for each OS are on this page.

Is CVE-2021-42707 being exploited?

CVE-2021-42707 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2021-42707 affect?

CVE-2021-42707 affects plc editor. Severity is 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 allow an attacker to execute arbitrary code.

How urgent is CVE-2021-42707?

Priority 43/100. High severity

Related CVEs

CVE-2021-42705 HIGH 7.8 UPGRADE PLC Editor Versions 1.3.8 and prior is vulnerable to a stack-based buffer overflow while processing project fi
CVE-2020-25181 HIGH 8.8 UPGRADE WECON PLC Editor Versions 1.3.8 and prior has a heap-based buffer overflow vulnerabilities have been identifie
CVE-2020-25177 HIGH 8.8 UPGRADE WECON PLC Editor Versions 1.3.8 and prior has a stack-based buffer overflow vulnerability has been identified

References

← Back to latest CVEs