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

published 2021-06-16 5 y ago modified 2026-06-17 4 mo ago also EUVD-2021-7550

cvss: 9.1; version 3.1, NVD
cisa kev: Not listed; not in CISA's catalog
epss: 33.3%; EPSS 33.3% chance of exploitation in 30 days, percentile 98%
public exploits: 0; none known

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.

Patch / fix

fixed in 5 links 2

siemens simatic_pcs_neo 3.1
siemens simit_simulation_platform 10.3
siemens sinec_infrastructure_network_services 1.0.1.1
siemens sinema_remote_connect_server 3.0
siemens simatic_process_historian 2020

tenable.com/security/research/tra-2021-24 advisory
cert-portal.siemens.com/productcert/pdf/ssa-675303.pdf advisory

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

cisa ICSA-21-210-02 updated 2025-05-06 cvss 9.1

Wibu-Systems CodeMeter Runtime

Siemens PSS(R)CAPE CAPE_14_installations_installed_from_material_dated_earlier_than_2021-06-16
affected: vendor fix, mitigation
Siemens SICAM 230
affected: mitigation, no fix planned
Siemens SIMATIC Information Server >=2019_SP1_<2020_Upd1 Siemens SIMATIC PCS neo <V3.1 Siemens SIMATIC Process Historian (incl. Process Historian OPC UA Server) >=2019_<2020_Upd1
affected: fixed in V3.1, mitigation
Siemens SIMATIC WinCC OA V3.17 <V3.17_P013
affected: fixed in V3.17, mitigation winccoa.com
Siemens SIMATIC WinCC OA V3.18 <V3.18_P002
affected: fixed in V3.18, mitigation winccoa.com
Siemens SIMIT Simulation Platform >=V10.0_<V10.3_Upd_1
affected: fixed in V10.3 support.industry.siemens.com
Siemens SINEC INS <V1.0.1_Update_1
affected: fixed in V1.0.1, mitigation support.industry.siemens.com
Siemens SINEMA Remote Connect Server <V3.0_SP2
affected: fixed in V3.0, mitigation support.industry.siemens.com

Facts from CISA's republication of the vendor's own advisory (CSAF); the linked advisory is the authoritative source. CISA notification · csaf

cisa ICSA-23-320-03 updated 2024-08-13 cvss 9.1

Siemens Desigo CC product family

Siemens Desigo CC family V5.0 Siemens Desigo CC family V5.1 Siemens Desigo CC family V6 Siemens SENTRON powermanager >=V4.0
affected: vendor fix

Facts from CISA's republication of the vendor's own advisory (CSAF); the linked advisory is the authoritative source. CISA notification · csaf

Exploit prediction

33.30% chance of exploitation in the next 30 days, higher than 98% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

tenable.com https://www.tenable.com/security/research/tra-2021-24 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by	version	score	vector
NVD	3.1	9.1	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
NVD	2.0	6.4	AV:N/AC:L/Au:N/C:P/I:N/A:P

Affected products

n/a Wibu-Systems CodeMeter

Classification

Weakness

CWE-125 Out-of-bounds Read

References

tenable.com /security/research/tra-2021-24
exploit, patch, third-party-advisory
cert-portal.siemens.com /productcert/pdf/ssa-675303.pdf
patch, third-party-advisory
cdn.wibu.com /fileadmin/wibu_downloads/security_advisories/Advisory_WIBU-210423-01.pdf
mitigation, vendor-advisory
us-cert.cisa.gov /ics/advisories/icsa-21-210-02
third-party-advisory, us-government-resource

Sources

CVE List CVE-2021-20093
NVD CVE-2021-20093

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary