CVE-2021-31893

HIGH

Siemens Simatic Pcs Firmware < 8.2 - Buffer Overflow

Title source: rule

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.

References (1)

Core 1

Core References

Patch, Vendor Advisory x_refsource_misc

https://cert-portal.siemens.com/productcert/pdf/ssa-641963.pdf

Scores

CVSS v3 7.8

EPSS 0.0016

EPSS Percentile 36.6%

Attack Vector LOCAL

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Details

CWE

CWE-120

Status published

Products (6)

siemens/simatic_pcs_firmware 9.0 (3 CPE variants)

siemens/simatic_pcs_firmware < 8.2

siemens/simatic_pdm_firmware < 9.2

siemens/simatic_step_7_firmware < 5.6

siemens/sinamics_starter_firmware 5.4 (3 CPE variants)

siemens/sinamics_starter_firmware < 5.4

Published Jul 13, 2021

Tracked Since Feb 18, 2026