Uncontrolled Memory Allocation in CODESYS Gateway Client
Published Sep 30, 2026
8.7
HIGHCVSS 4.0
EPSS 0.33%
Description
The CODESYS Gateway Client allocates memory based on a size field in a gateway response without enforcing an appropriate upper limit. An unauthenticated remote attacker controlling a malicious gateway can exploit this behavior to trigger excessive memory consumption, resulting in a denial-of-service condition thus leading to a total loss of availablity.
Affected products
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- Version 3.0.0.0StatusaffectedConstraints<3.5.22.40
- Version
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- Version 3.15.0.0StatusaffectedConstraints<4.23.0.0
- Version
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- Version 3.0.0.0StatusaffectedConstraints<3.5.22.40
- Version
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- Version 3.0.0.0StatusaffectedConstraints<3.5.22.40
- Version
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- Version 3.0.0.0StatusaffectedConstraints<3.5.22.40
- Version
-
- Version 3.0.0.0StatusaffectedConstraints<3.5.22.40
- Version
-
- Version 3.0.0.0StatusaffectedConstraints<3.5.22.40
- Version
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- Version 3.0.0.0StatusaffectedConstraints<3.5.22.40
- Version
Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
| Vendor | Product | Default status | Versions | ||||||
|---|---|---|---|---|---|---|---|---|---|
| Codesys | Development System 3 | unaffected |
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| Codesys | Edge Gateway for Linux | unaffected |
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| Codesys | Edge Gateway for Windows | unaffected |
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| Codesys | Gateway | unaffected |
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| Codesys | Hmi (sl) | unaffected |
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| Codesys | OPC DA Server SL | unaffected |
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| Codesys | PLCHandler | unaffected |
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| Codesys | Runtime Toolkit | unaffected |
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No data.
No data.
No Red Hat product state for this CVE.
No package ranges for this CVE.
Remediation
No remediation recorded yet.
Metrics
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
No CVSS v3.0 score for this CVE.
No CVSS v2.0 score for this CVE.
This CVE is not in the KEV list.
CISA SSVC (Vulnrichment)
Stakeholder-Specific Vulnerability Categorization from CISA ADP.
Exploitation
NoneAutomatable
YesTechnical Impact
PartialDecision
n/aAssessed Sep 30, 2026 · SSVC 2.0.3
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 4, 2026.
Score over time
Oct 2026- EPSS v5
Percentile over time
- EPSS v5
Table of values (2 key points)
Flat stretches are collapsed. Showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 4, 2026 | 0.33% (0.00327) | 23.57th | v5 (v2026.06.15) |
| Oct 1, 2026 | 0.57% (0.00573) | 45.34th | v5 (v2026.06.15) |
References (1)
Change history (0)
No recorded changes yet.