CVE-2021-31893

HIGH
7.8
CVSS Score
Published: July 13, 2021 at 11:02 AM UTC
Updated: June 17, 2026 at 03:52 AM UTC
9 products affected across 1 vendorSIMATIC Pdm FirmwareSIMATIC Pcs FirmwareSinamics Starter Firmware

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Severity
HIGH7.8
Exploit prediction
EPSS 0.6%

Description

A vulnerability has been identified in SIMATIC PCS 7 V8.2 and earlier (All versions), SIMATIC PCS 7 V9.0 (All versions < V9.0 SP3), SIMATIC PDM (All versions < V9.2), SIMATIC STEP 7 V5.X (All versions < V5.6 SP2 HF3), SINAMICS STARTER (containing STEP 7 OEM version) (All versions < V5.4 HF2). The affected software contains a buffer overflow vulnerability while handling certain files that could allow a local attacker to trigger a denial-of-service condition or potentially lead to remote code execution.

Affected

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

siemens-simatic-pcs (same device)
v < 9.2
Affected range stops below 9.2, so it looks safe — our inference, not a vendor statement
siemens-simatic-pdm (same device)
v ≤ 5.6
siemens-simatic-step-7 (same device)
Affected range stops below 5.4, so it looks safe — our inference, not a vendor statement
siemens-sinamics-starter (same device)
All versions < V5.4 HF2
All versions

Remediation

No guide yet

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

References (1)

CVSS

Attack Vector
LOCAL
Complexity
LOW
Privileges
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
HIGH
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-120

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