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CVE-2021-37199

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.1% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2021-10-12 · updated 2026-06-17
• Weakness: CWE-122

Description

A vulnerability has been identified in SINUMERIK 808D (All versions), SINUMERIK 828D (All versions < V4.95). Affected devices don't process correctly certain special crafted packets sent to port 102/tcp, which could allow an attacker to cause a denial-of-service in the device.

Affected products

• Siemens Sinumerik 808D Firmware: all versions
• Siemens Sinumerik 828D Firmware: before 4.95 — fixed in 4.95

How to fix

Upgrade to a fixed version: Siemens Sinumerik 828D Firmware 4.95. Check the vendor advisory for mitigations.

References

• https://cert-portal.siemens.com/productcert/pdf/ssa-178380.pdf
• https://cert-portal.siemens.com/productcert/pdf/ssa-178380.pdf

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