CVE-2021-25676

Name: CVE-2021-25676
Creator: NVD / NIST
Published: 2021-03-15T17:15:22.127+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.5/10EPSS 1.29%

Last modified Jun 17, 2026

CVE-2021-25676 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. 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. EPSS estimates a 1.29% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

7.5/10

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

EPSS Probability

1.29%

66.6th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-307

Affected Software

Vendor	Product	Versions
Siemens	Ruggedcom Rm1224 Firmware	6.3
Siemens	Scalance M-800 Firmware	6.3
Siemens	Scalance S615 Firmware	6.3
Siemens	Scalance Sc-600 Firmware	>= 2.1, < 2.1.3

References

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

Timeline

Published: Mar 15, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-25676?

How severe is CVE-2021-25676?

CVE-2021-25676 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 1.29% probability of exploitation in the next 30 days.

How do I fix CVE-2021-25676?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-25676?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST