Login Request a demo
High severity · published May 12, 2026
CVE-2026-35227
Improper resource management in CODESYS Modbus TCP Server
8.2
CVSS
0.4%
EPSS
No
On KEV
Description
An unauthenticated remote attacker may exhaust all available TCP connections in the CODESYS Modbus TCP Server stack if a race condition in connection handling is successfully exploited, preventing legitimate clients from establishing new connections.
Exploitation
Is it being used?
Exploit prediction (EPSS)0.4% · higher than 29% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
CM
CODESYS Modbus · CODESYS
1.0.0.0 before 4.6.0.0 · source: vendor
Affected product
CM
CODESYS Modbus
CODESYS
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-35227
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-35227
certvde.com
https://certvde.com/de/advisories/VDE-2026-042