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CVE-2021-25674

• Severity: medium (CVSS 5.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2021-03-15 · updated 2026-06-17
• Weakness: CWE-476

Description

A vulnerability has been identified in SIMATIC S7-PLCSIM V5.4 (All versions). An attacker with local access to the system could cause a Denial-of-Service condition in the application when it is used to open a specially crafted file. As a consequence, a NULL pointer deference condition could cause the application to terminate unexpectedly and must be restarted to restore the service.

Affected products

• Siemens SIMATIC S7-PLCSIM V5.4: 5.4

References

• https://cert-portal.siemens.com/productcert/pdf/ssa-256092.pdf
• https://cert-portal.siemens.com/productcert/pdf/ssa-256092.pdf

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