Is CVE-2021-20093 in the CISA KEV catalog?

No. CVE-2021-20093 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2021-20093?

CVE-2021-20093 has a CVSS v3 base score of 9.1 (CRITICAL).

What is the EPSS score for CVE-2021-20093?

CVE-2021-20093 has an EPSS score of 33.30% (98th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2021-20093?

Upgrade simatic pcs neo to 3.1 or later. Fixes are available for 5 affected products.

CVE & CISA-KEV Catalog

CVE-2021-20093

CRITICALEPSS 98th pctl

9.1

CVSS v3

NVD

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.

CWE-125Out-of-bounds Read

How to fix

Remediation Available

simatic pcs neoNVD

Affected:< 3.1Fixed in:3.1CVE-2021-20093derived from NVD

simatic process historianNVD

Affected:>= 2019, < 2020Fixed in:2020CVE-2021-20093derived from NVD

simit simulation platformNVD

Affected:>= 10.0, < 10.3Fixed in:10.3CVE-2021-20093derived from NVD

sinec infrastructure network servicesNVD

Affected:< 1.0.1.1Fixed in:1.0.1.1CVE-2021-20093derived from NVD

sinema remote connect serverNVD

Affected:< 3.0Fixed in:3.0CVE-2021-20093derived from NVD

TridentStack Control can deploy fixes like this automatically across your Windows, macOS, and Linux fleet. See how it works

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityNone

AvailabilityHigh

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

Exploit Intelligence

33.30%probability of exploitation in 30 days

98thpercentile

Very high risk: more likely to be exploited than 98% of all known CVEs.

References

Patch2

Vendor Advisory1

cdn.wibu.com

Third-Party Advisory1

us-cert.cisa.gov

Related Vulnerabilities

Other CWE-125 (Out-of-bounds Read) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2014-0160	High	7.5	100%	KEV	Fix
CVE-2025-5777	High	7.5	100%	KEV + Ransom	Fix
CVE-2021-4034	High	7.8	95%	KEV	Fix
CVE-2023-21769	High	7.5	92%	-	Fix
CVE-2020-8794	Critical	9.8	89%	-	Fix
CVE-2023-49285	High	8.6	89%	-	Fix

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2024-11-21.