CVE-2021-20093
A buffer over-read vulnerability exists in Wibu-Systems CodeMeter versions < 7.21a.
Does this matter?
EPSS puts the probability of exploitation in the next 30 days at 33.3%, higher than 98% of all known CVEs. Patch or mitigate before the next change window.
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.
- CVSS 3.1
- 9.1 CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
- EPSS
- 33.30% probability · 98th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Weakness
- CWE-125
- Affected
- wibu/codemeter · siemens/pss cape · siemens/sicam 230 firmware · siemens/simatic information server · siemens/simatic pcs neo · siemens/simatic wincc oa · siemens/simit simulation platform · siemens/sinec infrastructure network services · siemens/sinema remote connect server · siemens/simatic process historian
- Source
- vulnreport@tenable.com
EPSS 33.3% since 3 November 2026; no change recorded yet. The dashed line is the ten per cent mark our analysts treat as “patch before the next change window”. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
References
- https://cdn.wibu.com/fileadmin/wibu_downloads/security_advisories/Advisory_WIBU-210423-01.pdfMitigation, Vendor Advisory
- https://cert-portal.siemens.com/productcert/pdf/ssa-675303.pdfPatch, Third Party Advisory
- https://us-cert.cisa.gov/ics/advisories/icsa-21-210-02Third Party Advisory, US Government Resource
- https://www.tenable.com/security/research/tra-2021-24Exploit, Patch, Third Party Advisory
- https://cdn.wibu.com/fileadmin/wibu_downloads/security_advisories/Advisory_WIBU-210423-01.pdfMitigation, Vendor Advisory
- https://cert-portal.siemens.com/productcert/pdf/ssa-675303.pdfPatch, Third Party Advisory
- https://us-cert.cisa.gov/ics/advisories/icsa-21-210-02Third Party Advisory, US Government Resource
- https://www.tenable.com/security/research/tra-2021-24Exploit, Patch, Third Party Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.