CVE-2021-30191: Codesys v2 Web Server

High severity, CVSS 7.5. EPSS: 1% chance of exploitation in the next 30 days.

CODESYS V2 Web-Server before 1.1.9.20 has a a Buffer Copy without Checking the Size of the Input.

Affected products

• Codesys v2 Web Server: before 1.1.9.20 (fixed in 1.1.9.20)
• Wago 750-8202 Firmware: before 03.06.19_\(18\) (fixed in 03.06.19_\(18\))
• Wago 750-8203 Firmware: before 03.06.19_\(18\) (fixed in 03.06.19_\(18\))
• Wago 750-8204 Firmware: before 03.06.19_\(18\) (fixed in 03.06.19_\(18\))
• Wago 750-8206 Firmware: before 03.06.19_\(18\) (fixed in 03.06.19_\(18\))
• Wago 750-8207 Firmware: before 03.06.19_\(18\) (fixed in 03.06.19_\(18\))
• Wago 750-8208 Firmware: before 03.06.19_\(18\) (fixed in 03.06.19_\(18\))
• Wago 750-8210 Firmware: before 03.06.19_\(18\) (fixed in 03.06.19_\(18\))
• Wago 750-8211 Firmware: before 03.06.19_\(18\) (fixed in 03.06.19_\(18\))
• Wago 750-8212 Firmware: before 03.06.19_\(18\) (fixed in 03.06.19_\(18\))
• Wago 750-8213 Firmware: before 03.06.19_\(18\) (fixed in 03.06.19_\(18\))
• Wago 750-8214 Firmware: before 03.06.19_\(18\) (fixed in 03.06.19_\(18\))
• Wago 750-8216 Firmware: before 03.06.19_\(18\) (fixed in 03.06.19_\(18\))
• Wago 750-8217 Firmware: before 03.06.19_\(18\) (fixed in 03.06.19_\(18\))
• Wago 750-823 Firmware: before fw08 (fixed in fw08)
• Wago 750-829 Firmware: before fw15 (fixed in fw15)
• Wago 750-831 Firmware: before fw15 (fixed in fw15)
• Wago 750-832 Firmware: before fw08 (fixed in fw08)
• Wago 750-852 Firmware: before fw15 (fixed in fw15)
• Wago 750-862 Firmware: before fw08 (fixed in fw08)
• Wago 750-880 Firmware: before fw16 (fixed in fw16)
• Wago 750-881 Firmware: before fw15 (fixed in fw15)
• Wago 750-882 Firmware: before fw15 (fixed in fw15)
• Wago 750-885 Firmware: before fw15 (fixed in fw15)
• Wago 750-889 Firmware: before fw15 (fixed in fw15)
• and 3 more

Published 2021-05-25. Last modified 2026-06-17.