CVE-2021-25667

What it is

A vulnerability has been identified in RUGGEDCOM RM1224 (All versions >= V4.3 and < V6.4), SCALANCE M-800 (All versions >= V4.3 and < V6.4), SCALANCE S615 (All versions >= V4.3 and < V6.4), SCALANCE SC-600 Family (All versions >= V2.0 and < V2.1.3), SCALANCE XB-200 (All versions < V4.1), SCALANCE XC-200 (All versions < V4.1), SCALANCE XF-200BA (All versions < V4.1), SCALANCE XM400 (All versions < V6.2), SCALANCE XP-200 (All versions < V4.1), SCALANCE XR-300WG (All versions < V4.1), SCALANCE XR500 (All versions < V6.2). Affected devices contain a stack-based buffer overflow vulnerability in the handling of STP BPDU frames that could allow a remote attacker to trigger a denial-of-service condition or potentially remote code execution. Successful exploitation requires the passive listening feature of the device to be active.

At a glance

Exploitability

Can be exploited from the same network segment without logging in. High risk of data exposure, data tampering, service disruption.

Exploit odds

0.9% chance of exploitation in the next 30 days (EPSS).

Fix

A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

1. 2021-03-15 17:15 UTC PublishedDisclosed publicly on CVE.org and NVD
2. 2026-06-17 03:42 UTC Last updatedMost recent change to the record

Why it ranks here

• Exploited in the wild: no, CISA does not list it.
• Exploit odds: 0.9% in the next 30 days (EPSS).
• Severity: 8.8 HIGH (CVSS).
• Fix: a patch or advisory is linked.

Details

Published

2021-03-15 17:15 UTC

Last modified

2026-06-17 03:42 UTC

Exploit probability

0.9% · EPSS, next 30 days

Weakness

CWE-121

Record status

Modified

Affected

• Siemens Ruggedcom rm1224 Firmware < 6.4
• Siemens Scalance m-800 Firmware < 6.4
• Siemens Scalance s615 Firmware < 6.4
• Siemens Scalance x300wg Firmware < 4.1
• Siemens Scalance xm400 Firmware < 6.2
• Siemens Scalance xr500 Firmware < 6.2
• Siemens Scalance sc622-2c Firmware ≤ 2.0
• Siemens Scalance sc622-2c Firmware < 2.1.3

Attack profile CVSS 3.1 · 8.8

Attack vector

Adjacent network

Complexity

Low

Privileges needed

None

User interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Is it in your code?

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