What’s Vulnerable › Vulnerabilities

CVE-2021-20094

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 4.7% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2021-06-16 · updated 2026-06-17
• Weakness: CWE-125

Description

A denial of service vulnerability exists in Wibu-Systems CodeMeter versions < 7.21a. An unauthenticated remote attacker can exploit this issue to crash the CodeMeter Runtime Server.

Affected products

• Siemens Pss Cape: all versions
• Siemens Sicam 230 Firmware: all versions
• CodeMeter: before 7.21a — fixed in 7.21a

How to fix

Upgrade to a fixed version: CodeMeter 7.21a. Check the vendor advisory for mitigations.

References

• https://cdn.wibu.com/fileadmin/wibu_downloads/security_advisories/Advisory_WIBU-210423-02.pdf
• https://cert-portal.siemens.com/productcert/pdf/ssa-675303.pdf
• https://us-cert.cisa.gov/ics/advisories/icsa-21-210-02
• https://www.tenable.com/security/research/tra-2021-24
• https://cdn.wibu.com/fileadmin/wibu_downloads/security_advisories/Advisory_WIBU-210423-02.pdf
• https://cert-portal.siemens.com/productcert/pdf/ssa-675303.pdf
• https://us-cert.cisa.gov/ics/advisories/icsa-21-210-02
• https://www.tenable.com/security/research/tra-2021-24

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