Resource allocation without limits in Siemens SCALANCE W780 and W740 family
Priority LOW 21CWE-770Published · Updated
Key facts
- Attack vector
- Adjacent network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Denial of service
- Confidentiality · integrity · availability
- None · None · Low
- Fix status
- Fixed
Attack profile from CVSS 3.1 · NVD. Fix status from CNA. Impact type from CWE-770.
Summary
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.
Why it matters now
EPSS 0.00702 53rd percentileScored 2026-11-07
Fix Fixed SCALANCE W780 and W740 (IEEE 802.11n) family (Siemens): V6.3
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| Siemens | SCALANCE W780 and W740 (IEEE 802.11n) family | before V6.3 | V6.3 | Patch available | CNA |
- SCALANCE W780 and W740 (IEEE 802.11n) family VendorSiemens Affected before V6.3 Fixed in V6.3 Patch available CNA
CPE configurations NVD · 4
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:o:siemens:scalance_w780_firmware:*:*:*:*:*:*:*:* | before 6.3 | Vulnerable | Siemens |
| cpe:2.3:h:siemens:scalance_w780:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Siemens |
| cpe:2.3:o:siemens:scalance_w740_firmware:*:*:*:*:*:*:*:* | before 6.3 | Vulnerable | Siemens |
| cpe:2.3:h:siemens:scalance_w740:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Siemens |
- cpe:2.3:o:siemens:scalance_w780_firmware:*:*:*:*:*:*:*:* Versions before 6.3 Vulnerable ·Siemens
- cpe:2.3:h:siemens:scalance_w780:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Siemens
- cpe:2.3:o:siemens:scalance_w740_firmware:*:*:*:*:*:*:*:* Versions before 6.3 Vulnerable ·Siemens
- cpe:2.3:h:siemens:scalance_w740:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Siemens
Remediation
- Fix · CNA SCALANCE W780 and W740 (IEEE 802.11n) family (Siemens) Fixed in V6.3
Timeline
- 2026-10-02 Threatist record created from CVE-2021-25666
- 2026-10-03 Alias added: GHSA-462j-78vj-jjpr
References
Sources
- CVE-2021-25666 · CVE Program
- CVE-2021-25666 · NVD
- FIRST EPSS
- GHSA-462j-78vj-jjpr · GitHub Advisory Database · CC BY 4.0
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