Resource exhaustion in Siemens Scalance W740
CVE-2021-25666
A vulnerability has been identified in SCALANCE W780 and W740 (IEEE 802.11n) family (All versions < V6.3). Sending specially crafted packets through the ARP protocol to an affected device could cause a partial denial-of-service, preventing the device to operate normally for a short period of time.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 4.3 (Medium). Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L.
EPSS exploit prediction
EPSS: 0.007 (51.3th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 51st percentile — 51.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.007 · newest: 0.007 · change: 0.000
Affected products
Weakness classification (CWE)
References
- cert-portal.siemens.com/productcert/pdf/ssa-686152.pdf (Vendor Advisory)
- us-cert.cisa.gov/ics/advisories/icsa-21-040-07 (VDB Entry, Third Party Advisory)
Frequently asked questions
- What is CVE-2021-25666?
- CVE-2021-25666 is a medium-severity vulnerability in Siemens Scalance W740, classified under Allocation of Resources Without Limits or Throttling. CVSS score: 4.3/10. Published 2021-02-09.
- How severe is CVE-2021-25666?
- Medium severity. CVSS v3 base score is 4.3 out of 10.