How severe is CVE-2021-25667?

CVE-2021-25667 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over an adjacent network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2021-25667 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (54th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-25667?

CVE-2021-25667 primarily affects Siemens Ruggedcom Rm1224 Firmware. In total, 15 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2021-25667?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2021-25667 published?

CVE-2021-25667 was published on 2021-03-15 and last updated on 2026-06-17.

CVE-2021-25667

CVE-2021-25667 is a high-severity vulnerability in Siemens Ruggedcom Rm1224 Firmware with a CVSS 3.x base score of 8.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-121.

Key facts

Severity: High (CVSS 3.x base score 8.8)
CVSS v2: 5.8
EPSS exploit prediction: 1% (54th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-121
Affected product: Siemens Ruggedcom Rm1224 Firmware
Published: 2021-03-15
Last modified: 2026-06-17

Description

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.

Frequently asked questions

What is CVE-2021-25667?: 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.
How severe is CVE-2021-25667?: CVE-2021-25667 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over an adjacent network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2021-25667 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (54th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-25667?: CVE-2021-25667 primarily affects Siemens Ruggedcom Rm1224 Firmware. In total, 15 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2021-25667?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2021-25667 published?: CVE-2021-25667 was published on 2021-03-15 and last updated on 2026-06-17.

References

Affected products (15)

cpe:2.3:o:siemens:ruggedcom_rm1224_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:siemens:scalance_m-800_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:siemens:scalance_s615_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:siemens:scalance_x300wg_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:siemens:scalance_xm400_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:siemens:scalance_xr500_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:siemens:scalance_sc622-2c_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:siemens:scalance_sc632-2c_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:siemens:scalance_sc636-2c_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:siemens:scalance_sc642-2c_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:siemens:scalance_sc646-2c_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:siemens:scalance_xb-200_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:siemens:scalance_xc-200_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:siemens:scalance_xf-200ba_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:siemens:scalance_xp-200_firmware:*:*:*:*:*:*:*:*

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