What is CVE-2021-25665?

CVE-2021-25665 is a high-severity vulnerability in Siemens Simcenter Star-Ccm\+, classified under Out-of-bounds Write. CVSS score: 7.8/10. Published 2021-09-14.

How severe is CVE-2021-25665?

High severity. CVSS v3 base score is 7.8 out of 10.

Buffer overflow in Siemens Simcenter Star-Ccm\+

CVE-2021-25665

A vulnerability has been identified in Simcenter STAR-CCM+ Viewer (All versions < V2021.2.1). The starview+.exe application lacks proper validation of user-supplied data when parsing scene files. This could result in an out of bounds write past the end of an allocated structure. An attacker could leverage this vulnerability to execute code in the context of the current process. (ZDI-CAN-13700)

Vulnerability class: Buffer Overflow

Published 2021-09-14 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.8 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.013 (70.0th percentile), scored 2026-09-25.

Low probability of exploitation in the next 30 days, but still tracked. 70th percentile — 70.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.013 · newest: 0.013 · change: 0.000

Affected products

Siemens Simcenter Star-Ccm\+
Siemens Simcenter Star-Ccm+ Viewer — versions All versions < V2021.2.1

Weakness classification (CWE)

CWE-787 — Out-of-bounds Write

References

cert-portal.siemens.com/productcert/pdf/ssa-109294.pdf (Patch, Vendor Advisory)
www.zerodayinitiative.com/advisories/ZDI-21-1074/ (VDB Entry, Third Party Advisory)

Frequently asked questions

What is CVE-2021-25665?: CVE-2021-25665 is a high-severity vulnerability in Siemens Simcenter Star-Ccm\+, classified under Out-of-bounds Write. CVSS score: 7.8/10. Published 2021-09-14.
How severe is CVE-2021-25665?: High severity. CVSS v3 base score is 7.8 out of 10.