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CVE-2026-35225

Improper timeout handling in CODESYS EtherNetIP

HIGH
8.7
CVSS Score
Published: April 23, 2026 at 01:54 PM UTC
Updated: October 26, 2026 at 10:10 PM UTC
1 product affected across 1 vendorEthernetip

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Severity
HIGH8.7
Exploit prediction
EPSS 0.4%
SSVC
No known exploit

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Ethernetip· Codesys
90%
1.0.0.0 ≤ v < 4.9.0.01.0.0.0
Affected range stops below 4.9.0.0, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (2)

Vendor Advisory
Source: cverecord
https://codesys.csaf-tp.certvde.com/.well-known/csaf/white/2026/advisory2026-04_vde-2026-040.json
Vendor Advisory
Source: cverecord
https://www.certvde.com/en/advisories/VDE-2026-040/

SSVC — Action Prioritization

SSVCNo known exploitAutomatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

8.7HIGHCERTVDE
Vector?

Quick Info

StatusAWAITING ANALYSIS
CWE
CWE-754

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