CVE-2021-20093
A buffer over-read vulnerability exists in Wibu-Systems CodeMeter versions < 7.21a. An...
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.
- Severity
- 9.1 CriticalCVSS 3.1, NVD
- Exploit chance
- 33.3%EPSS, 98th percentile
- Exploitation
- None knownNot on CISA’s or ENISA’s lists
- Fixed in
- No fix listedNo source names one
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.
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
Affected products
- wibu codemeter
- wibu-systems codemeter
- siemens pss cape
- siemens sicam 230 firmware
- siemens simatic information server
- siemens simatic pcs neo
- siemens simatic process historian
- siemens simatic wincc oa
- siemens simit simulation platform
- siemens sinec infrastructure network services
- siemens sinema remote connect server
What each source reports
NVD Score used
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.
- Record
CVE-2021-20093- CVSS 3.1
- 9.1 Critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H - CVSS 2.0
- 6.4 Medium
AV:N/AC:L/Au:N/C:P/I:N/A:P - Weakness
- CWE-125
- Updated
- 2026-11-02
CVE ListNo score
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.
- Record
CVE-2021-20093- Updated
- 2026-11-02
EUVDEUVD-2021-7550No score
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.
- Record
EUVD-2021-7550- Updated
- 2026-11-03
GitHub AdvisoriesGHSA-m5xx-rgqg-j2m6
A buffer over-read vulnerability exists in Wibu-Systems CodeMeter versions < 7.21a. An...
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.
- Record
GHSA-m5xx-rgqg-j2m6- CVSS 3.1
- 9.1 Critical
CVSS: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
History
| Recorded | Changed | Sources |
|---|---|---|
| facts | ||
| aliases, products | EUVD | |
| first indexed | CVE List, GitHub Advisories, NVD |
Dates are when Every CVE recorded each change. Upstream dates may differ.
References
tenable.com/security/research/tra-2021-24
cdn.wibu.com/fileadmin/wibu_downloads/security_advisories/Advisory_WIBU-210423-01.pdf
cert-portal.siemens.com/productcert/pdf/ssa-675303.pdf
us-cert.cisa.gov/ics/advisories/icsa-21-210-02
nvd.nist.gov/vuln/detail/CVE-2021-20093
github.com/advisories/GHSA-m5xx-rgqg-j2m6