A vulnerability has been identified in SIMATIC S7-400 (incl
Published May 16, 2018
7.5
HIGHCVSS 3.0
EPSS 2.42%
Description
A vulnerability has been identified in SIMATIC S7-400 (incl. F) CPU hardware version 4.0 and below (All versions), SIMATIC S7-400 (incl. F) CPU hardware version 5.0 (All firmware versions < V5.2), SIMATIC S7-400H CPU hardware version 4.5 and below (All versions). The affected CPUs improperly validate S7 communication packets which could cause a Denial-of-Service condition of the CPU. The CPU will remain in DEFECT mode until manual restart.
Affected products
-
- Version SIMATIC S7-400 (incl. F) CPU hardware version 4.0 and below : All versionsStatusaffectedConstraints-
- Version SIMATIC S7-400 (incl. F) CPU hardware version 5.0 : All firmware versions < V5.2StatusaffectedConstraints-
- Version SIMATIC S7-400H CPU hardware version 4.5 and below : All versionsStatusaffectedConstraints-
- 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 | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Siemens AG | n/a | n/a |
|
Configuration 1
- ≤ 4.0
Running on/with
- n/a
Configuration 2
- < 5.2
Running on/with
- n/a
Configuration 3
- ≤ 4.5
Running on/with
- n/a
No data.
No Red Hat product state for this CVE.
No package ranges for this CVE.
Remediation
No remediation recorded yet.
Metrics
No CVSS v4.0 score for this CVE.
No CVSS v3.1 score for this CVE.
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
AV:N/AC:L/Au:N/C:N/I:N/A:P
This CVE is not in the KEV list.
No CISA SSVC assessment for this CVE yet.
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 1, 2026.
Score over time
2021–2026- EPSS v1
- EPSS v2
- EPSS v3
- EPSS v5
Percentile over time
- EPSS v1
- EPSS v2
- EPSS v3
- EPSS v5
Table of values (20 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 2.42% (0.02422) | 83.59th | v5 (v2026.06.15) |
| Jun 15, 2026 | 2.54% (0.02544) | 82.90th | v5 (v2026.06.15) |
| Jul 20, 2024 | 0.26% (0.00264) | 66.44th | v3 (v2023.03.01) |
| May 18, 2024 | 0.26% (0.00264) | 65.97th | v3 (v2023.03.01) |
| Jan 3, 2024 | 0.26% (0.00264) | 63.95th | v3 (v2023.03.01) |
| Nov 16, 2023 | 0.28% (0.00282) | 65.05th | v3 (v2023.03.01) |
| Oct 7, 2023 | 0.34% (0.00344) | 68.25th | v3 (v2023.03.01) |
| Jul 8, 2023 | 0.41% (0.00407) | 70.23th | v3 (v2023.03.01) |
| Jun 14, 2023 | 0.58% (0.00578) | 74.98th | v3 (v2023.03.01) |
| May 10, 2023 | 0.81% (0.00812) | 79.31th | v3 (v2023.03.01) |
| May 8, 2023 | 0.71% (0.00709) | 77.52th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.50% (0.00499) | 72.63th | v3 (v2023.03.01) |
| Mar 6, 2023 | 0.95% (0.00954) | 36.37th | v2 (v2022.01.01) |
| Sep 2, 2022 | 0.95% (0.00954) | 34.50th | v2 (v2022.01.01) |
| Apr 1, 2022 | 0.95% (0.00954) | 32.50th | v2 (v2022.01.01) |
| Feb 4, 2022 | 0.95% (0.00954) | 16.28th | v2 (v2022.01.01) |
| Feb 3, 2022 | 0.83% (0.00833) | 24.58th | v1 |
| Jan 6, 2022 | 0.83% (0.00833) | 23.96th | v1 |
| Sep 1, 2021 | 0.83% (0.00833) | 57.50th | v1 |
| Apr 14, 2021 | 0.83% (0.00833) | 0.00th | v1 |
References (3)
- http://www.securityfocus.com/bid/104217 vdb-entryx_refsource_BIDThird Party AdvisoryVDB Entry
- https://cert-portal.siemens.com/productcert/pdf/ssa-914382.pdf x_refsource_CONFIRMVendor Advisory
- https://www.siemens.com/global/en/home/products/services/cert.html#SecurityPublications x_refsource_CONFIRMVendor Advisory
| Link | Providers | Tags |
|---|---|---|
| http://www.securityfocus.com/bid/104217 | vdb-entryx_refsource_BIDThird Party AdvisoryVDB Entry | |
| https://cert-portal.siemens.com/productcert/pdf/ssa-914382.pdf | x_refsource_CONFIRMVendor Advisory | |
| https://www.siemens.com/global/en/home/products/services/cert.html#SecurityPublications | x_refsource_CONFIRMVendor Advisory |
Change history (0)
No recorded changes yet.