CVE-2021-20093

Exp

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.

Published: 2021-06-16 Last update: 2026-06-16 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2021-20093 is rated High Exploit Risk (90.8/100): CVSS Critical severity, with high exploitation likelihood (EPSS 33.30%, 98th percentile). 1 public exploit reference(s) are indexed (Exploit-DB). EPSS rose +25.10% over the last day, indicating growing attacker interest. Public exploits are available—assess exposure, apply mitigations, and prioritize patching.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Public exploit references (Exploit-DB) for CVE-2021-20093

EDB-ID Source Kind Published Link
— nvd_ref exploit_tag Exploit-DB ↗

Exploit prediction scoring system (EPSS) score for CVE-2021-20093

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-15 8.20% 33.30% +25.10%
2 2026-03-04 2.72% 8.20% +5.48%
3 2026-03-01 — 2.72% —

Full EPSS history (55 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2021-20093

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
9.1 3.1 CRITICAL
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 3.9 5.2 [email protected]
6.4 2.0 MEDIUM
AV:N/AC:L/Au:N/C:P/I:N/A:P Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:L)
Exploitation conditions are straightforward and predictable.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:P)
Partial confidentiality impact.
Integrity impact (I:N)
No integrity impact.
Availability impact (A:P)
Partial availability impact.
 10.0 4.9 [email protected]

Weakness enumeration for CVE-2021-20093

Affected software / configurations for CVE-2021-20093

Vendor Product Version Raw CPE
wibu codemeter <= 7.21a cpe:2.3:a:wibu:codemeter:*:*:*:*:*:*:*:*
siemens pss_cape — cpe:2.3:a:siemens:pss_cape:-:*:*:*:*:*:*:*
siemens sicam_230_firmware — cpe:2.3:o:siemens:sicam_230_firmware:*:*:*:*:*:*:*:*
siemens simatic_information_server 2019 cpe:2.3:a:siemens:simatic_information_server:2019:sp1:*:*:*:*:*:*
siemens simatic_information_server 2020 cpe:2.3:a:siemens:simatic_information_server:2020:-:*:*:*:*:*:*
siemens simatic_pcs_neo < 3.1 cpe:2.3:a:siemens:simatic_pcs_neo:*:*:*:*:*:*:*:*
siemens simatic_wincc_oa 3.17 cpe:2.3:a:siemens:simatic_wincc_oa:3.17:-:*:*:*:*:*:*
siemens simatic_wincc_oa 3.18 cpe:2.3:a:siemens:simatic_wincc_oa:3.18:-:*:*:*:*:*:*
siemens simit_simulation_platform >= 10.0, < 10.3 cpe:2.3:a:siemens:simit_simulation_platform:*:*:*:*:*:*:*:*
siemens simit_simulation_platform 10.3 cpe:2.3:a:siemens:simit_simulation_platform:10.3:-:*:*:*:*:*:*
siemens sinec_infrastructure_network_services < 1.0.1.1 cpe:2.3:a:siemens:sinec_infrastructure_network_services:*:*:*:*:*:*:*:*
siemens sinec_infrastructure_network_services 1.0.1 cpe:2.3:a:siemens:sinec_infrastructure_network_services:1.0.1:-:*:*:*:*:*:*
siemens sinema_remote_connect_server < 3.0 cpe:2.3:a:siemens:sinema_remote_connect_server:*:*:*:*:*:*:*:*
siemens sinema_remote_connect_server 3.0 cpe:2.3:a:siemens:sinema_remote_connect_server:3.0:-:*:*:*:*:*:*
siemens sinema_remote_connect_server 3.0 cpe:2.3:a:siemens:sinema_remote_connect_server:3.0:sp1:*:*:*:*:*:*
siemens simatic_process_historian >= 2019, < 2020 cpe:2.3:h:siemens:simatic_process_historian:*:*:*:*:*:*:*:*
siemens simatic_process_historian 2020 cpe:2.3:h:siemens:simatic_process_historian:2020:-:*:*:*:*:*:*

References for CVE-2021-20093

cvelogic Threat Intelligence