← Vulnerability feed

Vulnerability record · CVE-2021-20094 · published 16 June 2021

CVE-2021-20094: Wibu codemeter out-of-bounds read vulnerability

Wibu · Codemeter

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.

7.5 CVSS 3.1 High EPSS 4.7% · top 8.5% CWE-125 · Out-of-bounds read
7.5CVSS 3.1 base score, v2 5.0
4.7%EPSS exploitation probability, 30 days
NoNot in CISA KEV
3Affected product versions listed by NVD
8References, 2 tagged exploit
17 Jun 2026Last modified by NVD

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.

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

Affected products

3 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

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

Track CVE-2021-20094 inside VULONE

Watch it alongside the ransomware crews, C2 infrastructure and forum chatter that reference it, query it through the API and pull it into your SIEM over TAXII.

Start free Open in platform

Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

9.8CVE-2020-14509Wibu codemeter vulnerabilityMultiple memory corruption vulnerabilities exist in CodeMeter (All versions prior to 7.10) where the packet parser mechanism does not verify length f…EPSS 2.1%9.8CVE-2020-14517Wibu codemeter inadequate encryption strength vulnerabilityProtocol encryption can be easily broken for CodeMeter (All versions prior to 6.90 are affected, including Version 6.90 or newer only if CodeMeter Ru…EPSS 0.68%9.1CVE-2021-20093Wibu codemeter out-of-bounds read vulnerabilityA buffer over-read vulnerability exists in Wibu-Systems CodeMeter versions < 7.21a. An unauthenticated remote attacker can exploit this issue to disc…EPSS 33%7.5CVE-2020-14513Wibu codemeter improper input validation vulnerabilityCodeMeter (All versions prior to 6.81) and the software using it may crash while processing a specifically crafted license file due to unverified len…EPSS 1.6%7.5CVE-2020-14515Wibu codemeter improper verification of cryptographic signature vulnerabilityCodeMeter (All versions prior to 6.90 when using CmActLicense update files with CmActLicense Firm Code) has an issue in the license-file signature ch…EPSS 0.84%7.5CVE-2020-14519Wibu codemeter origin validation error vulnerabilityThis vulnerability allows an attacker to use the internal WebSockets API for CodeMeter (All versions prior to 7.00 are affected, including Version 7.…EPSS 0.64%7.5CVE-2020-16233Wibu codemeter improper resource shutdown vulnerabilityAn attacker could send a specially crafted packet that could have CodeMeter (All versions prior to 7.10) send back packets containing data from the h…EPSS 1.8%7.1CVE-2021-41057Wibu codemeter runtime link following vulnerabilityIn WIBU CodeMeter Runtime before 7.30a, creating a crafted CmDongles symbolic link will overwrite the linked file without checking permissions.EPSS 0.30%

Source: NIST National Vulnerability Database (record CVE-2021-20094), CISA KEV, FIRST EPSS (scores of 2026-09-29). This page is refreshed as NVD updates the record.