No exploitation reportedFix available

CVE-2021-40368

Q: Is CVE-2021-40368 actively exploited?

Active exploitation of CVE-2021-40368 has not been confirmed. Its EPSS score was 1.0% on 2026-10-23, the estimated probability of exploitation in the next 30 days.

Q: What is the CVSS score for CVE-2021-40368?

CVE-2021-40368 has a CVSS v3 base score of 7.5 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

No exploitation reported by the sources we read.

Published2022-04-12
WeaknessCWE-119

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

A vulnerability has been identified in SIMATIC S7-400 CPU 412-1 DP V7 (All versions), SIMATIC S7-400 CPU 412-2 DP V7 (All versions), SIMATIC S7-400 CPU 412-2 PN/DP V7 (All versions < V7.0.3), SIMATIC S7-400 CPU 414-2 DP V7 (All versions), SIMATIC S7-400 CPU 414-3 DP V7 (All versions), SIMATIC S7-400 CPU 414-3 PN/DP V7 (All versions < V7.0.3), SIMATIC S7-400 CPU 414F-3 PN/DP V7 (All versions < V7.0.3), SIMATIC S7-400 CPU 416-2 DP V7 (All versions), SIMATIC S7-400 CPU 416-3 DP V7 (All versions), SIMATIC S7-400 CPU 416-3 PN/DP V7 (All versions < V7.0.3), SIMATIC S7-400 CPU 416F-2 DP V7 (All versions), SIMATIC S7-400 CPU 416F-3 PN/DP V7 (All versions < V7.0.3), SIMATIC S7-400 CPU 417-4 DP V7 (All versions), SIMATIC S7-400 H V6 CPU family (incl. SIPLUS variants) (All versions < V6.0.10), SIMATIC S7-410 V10 CPU family (incl. SIPLUS variants) (All versions < V10.1), SIMATIC S7-410 V8 CPU family (incl. SIPLUS variants) (All versions < V8.2.3), SIPLUS S7-400 CPU 414-3 PN/DP V7 (All versions < V7.0.3), SIPLUS S7-400 CPU 416-3 PN/DP V7 (All versions < V7.0.3), SIPLUS S7-400 CPU 416-3 V7 (All versions), SIPLUS S7-400 CPU 417-4 V7 (All versions). Affected devices improperly handle specially crafted packets sent to port 102/tcp. This could allow an attacker to create a Denial-of-Service condition. A restart is needed to restore normal operations.

Timeline

dates in UTC

2022-04-1209:15CVE publishedNVD

Observed activity

isMalicious corpus · updated 2026-10-23 21:37 UTC

Indicators tagged with this CVE, per day0 indicators over 7 days

Block these indicators

Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2021-40368?format=txt
CSV export: https://api.ismalicious.com/edl/cve/CVE-2021-40368?format=csv
TAXII collection of exploited CVEs
The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD

Siemens simatic s7-400 pn\/dp v7 firmwareversion to verify

Branch	Affected	Fixed in	Source
—	all versions	no fix published	NVD

Siemens simatic s7-400h v6 firmwareversion to verify

Branch	Affected	Fixed in	Source
6.0	< 6.0.10	6.0.10	NVD

Siemens simatic s7-410 v10 firmwareversion to verify

Branch	Affected	Fixed in	Source
10.1	< 10.1	10.1	NVD

1 more product in the sources.

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Vendor advisories

ICSA-22-104-12 CISA20 known affected
Siemens SIMATIC S7-400
SIMATIC S7-400 CPU 412-1 DP V7 (6ES7412-1XJ07-0AB0) · SIMATIC S7-400 CPU 412-2 DP V7 (6ES7412-2XK07-0AB0) · SIMATIC S7-400 CPU 412-2 PN/DP V7 (6ES7412-2EK07-0AB0) · +17 more

Full record on NVD

Fix

Vendor fix CISA ICSA-22-104-12 · 1 productUpdate to V6.0.10 or later version
Vendor fix CISA ICSA-22-104-12 · 7 productsUpdate to V7.0.3 or later version
Vendor fix CISA ICSA-22-104-12 · 1 productUpdate to V8.2.3 or later version
Vendor fix CISA ICSA-22-104-12 · 1 productUpdate to V10.1 or later version To obtain SIMATIC S7-410 V10.1 contact your local support.
Mitigation from the vendor CISA ICSA-22-104-12 · 20 productsLimit access to port 102/tcp to trusted users and systems only
No fix planned, says the vendor CISA ICSA-22-104-12 · 10 productsCurrently no fix is planned

Advisories and patches

cert-portal.siemens.comPatch · Vendor Advisory

Detection

Nuclei template: none so far
Exploit-DB: no entry
Proof-of-concept repositories: none listed

Sources

CISA-ADPSSVC decisionnone2025-04-18
OpenCVESSVC decisionnone—
CNACVSS 3.17.5read 2026-10-23
NVDCVSS 3.17.5read 2026-10-23
NVDCVSS 2.05read 2026-10-23
CNAweakness (CWE)CWE-119read 2026-10-23
NVDweakness (CWE)CWE-119read 2026-10-23
FIRST EPSSEPSS score1.0 %2026-10-23

Technical details

CVSS v3 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Published: 2022-04-12
Last Modified: 2026-06-17
NVD status: Modified

Frequently asked questions

What is CVE-2021-40368?

Is CVE-2021-40368 actively exploited?

Active exploitation of CVE-2021-40368 has not been confirmed. Its EPSS score was 1.0% on 2026-10-23, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2021-40368?

CVE-2021-40368 has a CVSS v3 base score of 7.5 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

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