CVE-2021-20093

Name: CVE-2021-20093
Creator: NVD / NIST
Published: 2021-06-16T12:15:12.037+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.1/10EPSS 33.30%

Last modified Jun 17, 2026

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

CVSS 3.1

9.1/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H

EPSS Probability

33.30%

98.2th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-125

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: Jun 16, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-20093?

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.

Are you affected by CVE-2021-20093?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST