CVE-2021-40358

high-risk
Published 2021-11-09

A vulnerability has been identified in SIMATIC PCS 7 V8.2 (All versions), SIMATIC PCS 7 V9.0 (All versions < V9.0 SP3 UC04), SIMATIC PCS 7 V9.1 (All versions < V9.1 SP1), SIMATIC WinCC V15 and earlier (All versions < V15 SP1 Update 7), SIMATIC WinCC V16 (All versions < V16 Update 5), SIMATIC WinCC V17 (All versions < V17 Update 2), SIMATIC WinCC V7.4 (All versions < V7.4 SP1 Update 19), SIMATIC WinCC V7.5 (All versions < V7.5 SP2 Update 5). Legitimate file operations on the web server of the affected systems do not properly neutralize special elements within the pathname. An attacker could then cause the pathname to resolve to a location outside of the restricted directory on the server and read, write or delete unexpected critical files.

Do I need to act?

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0.69% chance of exploitation
EPSS score — low exploit probability
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Not on CISA KEV list
No confirmed active exploitation reported to CISA
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Patch status unknown
Check vendor advisories for fix availability and mitigation guidance
9
CVSS 9.9/10 Critical
NETWORK / LOW complexity

Affected Products (20)

Affected Vendors

Siemens

References (2)

Vendor Advisory https://cert-portal.siemens.com/productcert/pdf/ssa-840188.pdf
Vendor Advisory https://cert-portal.siemens.com/productcert/pdf/ssa-840188.pdf
60
/ 100
high-risk
Severity 33/34 · Critical
Exploitability 2/34 · Minimal
Exposure 25/34 · High