CVE-2021-20093
CRITICALCVSS 9.1/10EPSS 33.30%
Last modified
CVE-2021-20093 is a critical-severity vulnerability rated 9.1/10 on the CVSS scale. A buffer over-read vulnerability exists in Wibu-Systems CodeMeter versions < 7.21a. An unauthenticated remote attacker can exploit this issue to disclose heap memory contents or crash the CodeMeter Runtime Server.. EPSS estimates a 33.30% chance of exploitation in the next 30 days.
Description
A buffer over-read vulnerability exists in Wibu-Systems CodeMeter versions < 7.21a. An unauthenticated remote attacker can exploit this issue to disclose heap memory contents or crash the CodeMeter Runtime Server.
Metrics
Weakness Enumeration
Affected Software
| Vendor | Product | Versions | Update |
|---|---|---|---|
| Wibu | Codemeter | <= 7.21a | — |
| Siemens | Pss Cape | All versions | — |
| Siemens | Sicam 230 Firmware | All versions | — |
| Siemens | Simatic Information Server | 2019 | Sp1 |
| Siemens | Simatic Information Server | 2020 | — |
| Siemens | Simatic Pcs Neo | < 3.1 | — |
| Siemens | Simatic Wincc Oa | 3.17 | — |
| Siemens | Simatic Wincc Oa | 3.18 | — |
| Siemens | Simit Simulation Platform | >= 10.0, < 10.3 | — |
| Siemens | Simit Simulation Platform | 10.3 | — |
| Siemens | Sinec Infrastructure Network Services | < 1.0.1.1 | — |
| Siemens | Sinec Infrastructure Network Services | 1.0.1 | — |
| Siemens | Sinema Remote Connect Server | < 3.0 | — |
| Siemens | Sinema Remote Connect Server | 3.0 | — |
| Siemens | Simatic Process Historian | >= 2019, < 2020 | — |
| Siemens | Simatic Process Historian | 2020 | — |
References
- https://cdn.wibu.com/fileadmin/wibu_downloads/security_advisories/Advisory_WIBU-210423-01.pdfMitigation, Vendor Advisory
- https://cert-portal.siemens.com/productcert/pdf/ssa-675303.pdfPatch, Third Party Advisory
- https://us-cert.cisa.gov/ics/advisories/icsa-21-210-02Third Party Advisory, US Government Resource
- https://www.tenable.com/security/research/tra-2021-24Exploit, Patch, Third Party Advisory
- https://cdn.wibu.com/fileadmin/wibu_downloads/security_advisories/Advisory_WIBU-210423-01.pdfMitigation, Vendor Advisory
- https://cert-portal.siemens.com/productcert/pdf/ssa-675303.pdfPatch, Third Party Advisory
- https://us-cert.cisa.gov/ics/advisories/icsa-21-210-02Third Party Advisory, US Government Resource
- https://www.tenable.com/security/research/tra-2021-24Exploit, Patch, Third Party Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
What is CVE-2021-20093?
A buffer over-read vulnerability exists in Wibu-Systems CodeMeter versions < 7.21a. An unauthenticated remote attacker can exploit this issue to disclose heap memory contents or crash the CodeMeter Runtime Server.
How severe is CVE-2021-20093?
CVE-2021-20093 has a CVSS score of 9.1/10 (CRITICAL severity). The EPSS model estimates a 33.30% probability of exploitation in the next 30 days.
How do I fix CVE-2021-20093?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.
How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
- Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
- PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
- AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.
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Are you affected by CVE-2021-20093?
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Scan your code nowSource: NVD / NIST