CVE-2021-20093

A buffer over-read vulnerability exists in Wibu-Systems CodeMeter versions < 7.21a. An...

9.1 Critical

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.

Attack profile

How easy it is to exploit

Attack vector: Network
Complexity: Low
Privileges needed: None
User interaction: None

What an attacker can affect

Confidentiality: High
Integrity: None
Availability: High

Exploit likelihood

33.3%Up 32.5 points since Jun 17, 2021

What each source reports

NVD Score used 9.1

Record: CVE-2021-20093
CVSS 3.1: 9.1 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
CVSS 2.0: 6.4 MediumAV:N/AC:L/Au:N/C:P/I:N/A:P
Weakness: CWE-125
Updated: 2026-11-02

CVE List No score

Record: CVE-2021-20093
Updated: 2026-11-02

EUVDEUVD-2021-7550 No score

Record: EUVD-2021-7550
Updated: 2026-11-03

GitHub AdvisoriesGHSA-m5xx-rgqg-j2m6 9.1

A buffer over-read vulnerability exists in Wibu-Systems CodeMeter versions < 7.21a. An...

Record: GHSA-m5xx-rgqg-j2m6
CVSS 3.1: 9.1 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
Weakness: CWE-125
Updated: 2026-11-02

Affected products

History

History
Recorded	Changed	Sources
Nov 3, 2026	aliases, products	EUVD
Nov 2, 2026	first indexed	CVE List, GitHub Advisories, NVD

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2021-20093 is a critical vulnerability (CVSS 9.1) in Wibu Codemeter, published June 16, 2021. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 33.3%, the 98th percentile. No source names a fixed version.