Vulnerability in Siemens Capital Embedded Ar Classic 431-422
CVE-2021-25663
A vulnerability has been identified in Capital Embedded AR Classic 431-422 (All versions), Capital Embedded AR Classic R20-11 (All versions < V2303), Nucleus NET (All versions), Nucleus ReadyStart V3 (All versions < V2017.02.4), Nucleus ReadyStart V4 (All versions < V4.1.0), Nucleus Source Code (All versions including affected IPv6 stack). The function that processes IPv6 headers does not check the lengths of extension header options, allowing attackers to put this function into an infinite loop with crafted length values.
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: 0.019 (79.2th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 79th percentile — 79.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.019 · newest: 0.019 · change: 0.000
Affected products
- Siemens Capital Embedded Ar Classic 431-422 — versions 0
- Siemens Capital Embedded Ar Classic R20-11 — versions 0
- Siemens Capital Vstar
- Siemens Nucleus Net — versions All versions
- Siemens Nucleus Net
- Siemens Nucleus Readystart
- Siemens Nucleus Readystart V3 — versions 0
- Siemens Nucleus Readystart V4 — versions 0
- Siemens Nucleus Source Code — versions 0
- Siemens Nucleus Source Code
Weakness classification (CWE)
Public proof-of-concept exploits
References
- cert-portal.siemens.com/productcert/pdf/ssa-248289.pdf (Vendor Advisory)
- us-cert.cisa.gov/ics/advisories/icsa-21-103-05 (US Government Resource, Third Party Advisory)
- cert-portal.siemens.com/productcert/html/ssa-248289.html
Frequently asked questions
- What is CVE-2021-25663?
- CVE-2021-25663 is a high-severity vulnerability in Siemens Capital Embedded Ar Classic 431-422, classified under Loop with Unreachable Exit Condition (Infinite Loop). CVSS score: 7.5/10. Published 2021-04-22.
- How severe is CVE-2021-25663?
- High severity. CVSS v3 base score is 7.5 out of 10.
- Is CVE-2021-25663 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.