Buffer overflow in Siemens Siprotec 5 Relays With CPU Variants Cp050
CVE-2021-33720
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.
Vulnerability class: Buffer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.010 (62.6th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 63rd percentile — 62.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.010 · newest: 0.010 · change: 0.000
Affected products
- Siemens Siprotec 5 Relays With CPU Variants Cp050 — versions All versions < V8.80
- Siemens Siprotec 5 Relays With CPU Variants Cp100 — versions All versions < V8.80
- Siemens Siprotec 5 Relays With CPU Variants Cp300 — versions All versions < V8.80
- Siemens Siprotec 5 With CPU Variant Cp050
- Siemens Siprotec 5 With CPU Variant Cp100
- Siemens Siprotec 5 With CPU Variant Cp300
Weakness classification (CWE)
References
- cert-portal.siemens.com/productcert/pdf/ssa-847986.pdf (Patch, Vendor Advisory)
Frequently asked questions
- What is CVE-2021-33720?
- CVE-2021-33720 is a high-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: 7.5/10. Published 2021-09-14.
- How severe is CVE-2021-33720?
- High severity. CVSS v3 base score is 7.5 out of 10.