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CVE-2021-40368

HIGH
7.5
CVSS Score
Published: April 12, 2022 at 09:07 AM UTC
Updated: June 17, 2026 at 04:06 AM UTC
27 products affected across 1 vendorSIMATIC S7-400 Pn /dp V7 FirmwareSIMATIC S7-400h V6 FirmwareSIMATIC S7-410 V8 Firmware

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Severity
HIGH7.5
Exploit prediction
EPSS 1%
SSVC
No known exploit

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.

Affected

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

SIMATIC S7-400 Pn /dp V7 Firmware· Siemens
95%
All versions
siemens-simatic-s7-400-pn-dp-v7 (same device)
SIMATIC S7-400h V6 Firmware· Siemens
95%
v < 6.0.10
Affected range stops below 6.0.10, so it looks safe — our inference, not a vendor statement
siemens-simatic-s7-400h-v6 (same device)
SIMATIC S7-410 V10 Firmware· Siemens
95%
v < 10.1
Affected range stops below 10.1, so it looks safe — our inference, not a vendor statement
siemens-simatic-s7-410-v10 (same device)
SIMATIC S7-410 V8 Firmware· Siemens
95%
All versions
siemens-simatic-s7-410-v8 (same device)
SIMATIC S7-400 CPU 412-1 DP· Siemens
60%
7
SIMATIC S7-400 CPU 412-2 DP· Siemens
60%
7
SIMATIC S7-400 CPU 412-2 PN/DP· Siemens
60%
All versions < V7.0.3
SIMATIC S7-400 CPU 414-2 DP· Siemens
60%
7
SIMATIC S7-400 CPU 414-3 DP· Siemens
60%
7
SIMATIC S7-400 CPU 414-3 Pn /dp· Siemens
60%
All versions < V7.0.3

Remediation

No guide yet

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

Patch and advisory references

References (1)

PatchVendor Advisory
Source: [email protected]
https://cert-portal.siemens.com/productcert/pdf/ssa-557541.pdf

SSVC — Action Prioritization

SSVCNo known exploitAutomatablePartial impact

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

CVSS

7.5HIGHsiemens
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-119

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