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Vulnerability · Published Jul 13, 2021 · Assigned by siemens

CVE-2021-31894

High 8.8

In plain English

A high-severity incorrect permission assignment in SIMATIC PCS 7 V8.2 and earlier from Siemens. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 14% of all known vulnerabilities).

Severity (CVSS NVD)8.8High
Exploit odds (30 days)0.2%top 86.4% of all CVEs
Exploited in the wildNo reportsnot in CISA KEV
Attack toolingNoneno public tooling known

Official description

A vulnerability has been identified in SIMATIC PCS 7 V8.2 and earlier (All versions), SIMATIC PCS 7 V9.X (All versions < V9.1 SP2), SIMATIC PDM (All versions < V9.2 SP2), SIMATIC STEP 7 V5.X (All versions < V5.7), SINAMICS STARTER (containing STEP 7 OEM version) (All versions < V5.4 SP2 HF1). A directory containing metafiles relevant to devices' configurations has write permissions. An attacker could leverage this vulnerability by changing the content of certain metafiles and subsequently manipulate parameters or behavior of devices that would be later configured by the affected software.

Affected products (as reported)

VendorProductVersions
Siemens SIMATIC PCS 7 V8.2 and earlier All versions
Siemens SIMATIC PCS 7 V9.X All versions < V9.1 SP2
Siemens SIMATIC PDM All versions < V9.2 SP2
Siemens SIMATIC STEP 7 V5.X All versions < V5.7
Siemens SINAMICS STARTER (containing STEP 7 OEM version) All versions < V5.4 SP2 HF1

Weakness: CWE-732

References