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Vulnerability record · CVE-2021-25676 · published 15 March 2021

CVE-2021-25676: Siemens ruggedcom rm1224 firmware improper restriction of authentication attempts vulnerability

Siemens · Ruggedcom Rm1224 Firmware

A vulnerability has been identified in RUGGEDCOM RM1224 (V6.3), SCALANCE M-800 (V6.3), SCALANCE S615 (V6.3), SCALANCE SC-600 (All Versions >= V2.1 and < V2.1.3). Multiple failed SSH authentication attempts could trigger a temporary Denial-of-Service under certain conditions. When triggered, the device will reboot automatically.

7.5 CVSS 3.1 High EPSS 1.3% · top 30.9% CWE-307 · Improper restriction of authentication attempts
7.5CVSS 3.1 base score, v2 5.0
1.3%EPSS exploitation probability, 30 days
NoNot in CISA KEV
4Affected product versions listed by NVD
4References
17 Jun 2026Last modified by NVD

Description

A vulnerability has been identified in RUGGEDCOM RM1224 (V6.3), SCALANCE M-800 (V6.3), SCALANCE S615 (V6.3), SCALANCE SC-600 (All Versions >= V2.1 and < V2.1.3). Multiple failed SSH authentication attempts could trigger a temporary Denial-of-Service under certain conditions. When triggered, the device will reboot automatically.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected products

4 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://cert-portal.siemens.com/productcert/pdf/ssa-296266.pdf Vendor Advisory
https://us-cert.cisa.gov/ics/advisories/icsa-21-068-02 Third Party AdvisoryUS Government Resource
https://cert-portal.siemens.com/productcert/pdf/ssa-296266.pdf Vendor Advisory
https://us-cert.cisa.gov/ics/advisories/icsa-21-068-02 Third Party AdvisoryUS Government Resource

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Source: NIST National Vulnerability Database (record CVE-2021-25676), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.