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CVE-2021-20093

46
FAUCET Score

CVE-2021-20093 is a critical buffer over-read vulnerability affecting Wibu-Systems CodeMeter versions prior to 7.21a, impacting products from vendors like Siemens. This flaw allows an unauthenticated remote attacker to disclose heap memory contents or crash the CodeMeter Runtime Server with low attack complexity. While not listed on CISA's KEV catalog and lacking public exploit code in Metasploit or ExploitDB, it has garnered significant community discussion and media coverage, indicating awareness and potential for future exploitation.

Impacted Technologies

VendorProductVersion(s)CPE
<= 7.21aCPE matchmatch criteria
cpe:2.3:a:wibu:codemeter:*:*:*:*:*:*:*:*
Range not provided by sourceCPE matchmatch criteria
cpe:2.3:a:siemens:pss_cape:-:*:*:*:*:*:*:*
All Versions ImpactedCPE matchmatch criteria
cpe:2.3:o:siemens:sicam_230_firmware:*:*:*:*:*:*:*:*
2019CPE matchmatch criteria
cpe:2.3:a:siemens:simatic_information_server:2019:sp1:*:*:*:*:*:*
2020CPE matchmatch criteria
cpe:2.3:a:siemens:simatic_information_server:2020:-:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

9.1CRITICAL

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
NONE
Availability Impact
HIGH
Exploitability Score
3.9
Impact Score
5.2
CvssVersion
3.1

Exploit Intelligence

EPSS Score
33.30%
Probability of exploitation in next 30 days
EPSS Percentile
98.2%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.3330 is in the 95th percentile among its peer group of 36,862 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.3 Bluesky, 0.3 Mastodon, and 2.4 GitHub mentions.

Media Mentions

The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (6)

bentomlpatch availablevia llm_extracted
Fixed in: 4.05.03 or later
View patch
asteriskvendor investigatingvia llm_extracted
ciscovendor investigatingvia llm_extracted
miniovendor investigatingvia llm_extracted
opensshvendor investigatingvia llm_extracted
railsvendor investigatingvia llm_extracted

Vendor Advisories (6)

opensshllm-openssh-e73981e5fbc63077CRITICAL

Multiple Vulnerabilities in Wibu-Systems CodeMeter

Jun 15, 2021
railsllm-rails-779c1b8e8380ec63CRITICAL

Multiple Vulnerabilities in Wibu-Systems CodeMeter

Jun 15, 2021
miniollm-minio-65b0c088cc23f660CRITICAL

Multiple Vulnerabilities in Wibu-Systems CodeMeter

Jun 15, 2021
ciscollm-cisco-73204e87af1eb280CRITICAL

Multiple Vulnerabilities in Wibu-Systems CodeMeter

Jun 15, 2021
asteriskllm-asterisk-a68bed8d9814e795CRITICAL

Multiple Vulnerabilities in Wibu-Systems CodeMeter

Jun 15, 2021
bentomlllm-bentoml-50e09cd86774b403

Vulnerability in FactoryTalk Activation Manager

References

cdn.wibu.com / fileadmin/wibu_downloads/security_advisories/Advisory_WIBU-210423-01.pdf
MitigationVendor Advisory
cert-portal.siemens.com / productcert/pdf/ssa-675303.pdf
PatchThird Party Advisory
us-cert.cisa.gov / ics/advisories/icsa-21-210-02
Third Party AdvisoryUS Government Resource
tenable.com / security/research/tra-2021-24
ExploitPatchThird Party Advisory