CVE-2021-37205

HIGH
7.5
CVSS Score
Published: February 9, 2022 at 03:16 PM UTC
Updated: June 17, 2026 at 04:00 AM UTC
99 products affected across 1 vendorSIMATIC Drive Controller CPU 1507D Tf FirmwareSIMATIC Drive Controller CPU 1504D Tf FirmwareTim 1531 Irc Firmware

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Severity
HIGH7.5
Exploit prediction
EPSS 2%
SSVC
No known exploit

Description

A vulnerability has been identified in SIMATIC Drive Controller family (All versions >= V2.9.2 < V2.9.4), SIMATIC ET 200SP Open Controller CPU 1515SP PC2 (incl. SIPLUS variants) (All versions >= V21.9 < V21.9.4), SIMATIC S7-1200 CPU family (incl. SIPLUS variants) (All versions >= V4.5.0 < V4.5.2), SIMATIC S7-1500 CPU family (incl. related ET200 CPUs and SIPLUS variants) (All versions >= V2.9.2 < V2.9.4), SIMATIC S7-1500 Software Controller (All versions >= V21.9 < V21.9.4), SIMATIC S7-PLCSIM Advanced (All versions >= V4.0 < V4.0 SP1), SIPLUS TIM 1531 IRC (All versions < V2.3.6), TIM 1531 IRC (All versions < V2.3.6). An unauthenticated attacker could cause a denial-of-service condition in a PLC when sending specially prepared packets over port 102/tcp. A restart of the affected device is needed to restore normal operations.

Affected

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

v < 2.9.4
Affected range stops below 2.9.4, so it looks safe — our inference, not a vendor statement
siemens-simatic-drive-controller-cpu-1504d-tf (same device)
v < 2.9.4
Affected range stops below 2.9.4, so it looks safe — our inference, not a vendor statement
siemens-simatic-drive-controller-cpu-1507d-tf (same device)
All versions
siemens-simatic-et-200sp-open-controller-cpu-1515sp-pc2 (same device)
4.5.0 ≤ v < 4.5.2
Affected range stops below 4.5.2, so it looks safe — our inference, not a vendor statement
siemens-simatic-s7-1200-cpu-1211c (same device)
4.5.0 ≤ v < 4.5.2
Affected range stops below 4.5.2, so it looks safe — our inference, not a vendor statement
siemens-simatic-s7-1200-cpu-1212c (same device)
4.5.0 ≤ v < 4.5.2
Affected range stops below 4.5.2, so it looks safe — our inference, not a vendor statement
siemens-simatic-s7-1200-cpu-1212fc (same device)
4.5.0 ≤ v < 4.5.2
Affected range stops below 4.5.2, so it looks safe — our inference, not a vendor statement
siemens-simatic-s7-1200-cpu-1214fc (same device)
4.5.0 ≤ v < 4.5.2
Affected range stops below 4.5.2, so it looks safe — our inference, not a vendor statement
siemens-simatic-s7-1200-cpu-1214c (same device)
4.5.0 ≤ v < 4.5.2
Affected range stops below 4.5.2, so it looks safe — our inference, not a vendor statement
siemens-simatic-s7-1200-cpu-1215fc (same device)
4.5.0 ≤ v < 4.5.2
Affected range stops below 4.5.2, so it looks safe — our inference, not a vendor statement
siemens-simatic-s7-1200-cpu-1215c (same device)

Remediation

No guide yet

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

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-401

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