High severity · published Apr 23, 2026
CVE-2026-35225
Improper timeout handling in CODESYS EtherNetIP
8.7
CVSS
0.4%
EPSS
No
On KEV
Description
An unauthenticated remote attacker is able to exhaust all available TCP connections in the CODESYS EtherNet/IP adapter stack, preventing legitimate clients from establishing new connections.
Exploitation
Is it being used?
Exploit prediction (EPSS)0.4% · higher than 35% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
CE
CODESYS EtherNetIP · CODESYS
1.0.0.0 before 4.9.0.0 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-35225
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-35225
codesys.csaf-tp.certvde.com
https://codesys.csaf-tp.certvde.com/.well-known/csaf/white/2026/advisory2026-04_vde-2026-040.json
www.certvde.com
https://www.certvde.com/en/advisories/VDE-2026-040/