What is CVE-2023-43504?

CVE-2023-43504 is a critical-severity vulnerability in Siemens Comos, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). CVSS score: 9.6/10. Published 2023-11-14.

How severe is CVE-2023-43504?

Critical severity. CVSS v3 base score is 9.6 out of 10.

Buffer overflow in Siemens Comos

CVE-2023-43504

A vulnerability has been identified in COMOS (All versions < V10.4.4). Ptmcast executable used for testing cache validation service in affected application is vulnerable to Structured Exception Handler (SEH) based buffer overflow. This could allow an attacker to execute arbitrary code on the target system or cause denial of service condition.

Vulnerability class: Buffer Overflow

Published 2023-11-14 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 9.6 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.009 (56.6th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 57th percentile — 56.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.009 · newest: 0.009 · change: 0.000

Affected products

Siemens Comos — versions All versions < V10.4.4

Weakness classification (CWE)

CWE-120 — Buffer Copy without Checking Size of Input (Classic Buffer Overflow)

References

cert-portal.siemens.com/productcert/pdf/ssa-137900.pdf (Vendor Advisory)

Frequently asked questions

What is CVE-2023-43504?: CVE-2023-43504 is a critical-severity vulnerability in Siemens Comos, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). CVSS score: 9.6/10. Published 2023-11-14.
How severe is CVE-2023-43504?: Critical severity. CVSS v3 base score is 9.6 out of 10.