Buffer overflow in Siemens Siprotec 5 Relays With CPU Variants Cp050

CVE-2021-33719

A vulnerability has been identified in SIPROTEC 5 relays with CPU variants CP050 (All versions < V8.80), SIPROTEC 5 relays with CPU variants CP100 (All versions < V8.80), SIPROTEC 5 relays with CPU variants CP300 (All versions < V8.80). Specially crafted packets sent to port 4443/tcp could cause a Denial-of-Service condition or potential remote code execution.

Vulnerability class: Buffer Overflow

EPSS: 0.022 (80.3th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

Affected products

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2021-33719?
CVE-2021-33719 is a critical-severity vulnerability in Siemens Siprotec 5 Relays With CPU Variants Cp050, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). CVSS score: 9.8/10. Published 2021-09-14.
How severe is CVE-2021-33719?
Critical severity. CVSS v3 base score is 9.8 out of 10.