Medium severity4.3NVD Advisory· Published Feb 9, 2021· Updated Jun 17, 2026
CVE-2021-25666
CVE-2021-25666
Description
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.
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LLM-synthesized narrative grounded in this CVE's description and references.
Affected products
4- cpe:2.3:o:siemens:scalance_w740_firmware:*:*:*:*:*:*:*:*Range: <6.3
- cpe:2.3:o:siemens:scalance_w780_firmware:*:*:*:*:*:*:*:*Range: <6.3
- Range: <V6.3
- Siemens/SCALANCE W780 and W740 (IEEE 802.11n) familyv5Range: All versions < V6.3
Patches
Vulnerability mechanics
References
2- cert-portal.siemens.com/productcert/pdf/ssa-686152.pdfnvdVendor Advisory
- us-cert.cisa.gov/ics/advisories/icsa-21-040-07nvdThird Party AdvisoryVDB Entry
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