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CVE-2021-25667

HIGH
8.8
CVSS Score
Published: March 15, 2021 at 05:03 PM UTC
Updated: June 17, 2026 at 03:42 AM UTC
32 products affected across 1 vendorScalance S615 FirmwareScalance Sc646-2c FirmwareScalance Sc632-2c Firmware

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Severity
HIGH8.8
Exploit prediction
EPSS 1.0%
SSVC
No known exploit

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

RUGGEDCOM RM1224 Firmware· Siemens
95%
4.3 ≤ v < 6.4All versions >= V4.3 and < V6.4
Affected range stops below 6.4, so it looks safe — our inference, not a vendor statement
Scalance M 800 Firmware· Siemens
95%
4.3 ≤ v < 6.4
Affected range stops below 6.4, so it looks safe — our inference, not a vendor statement
siemens-scalance-m-800 (same device)
Scalance S615 Firmware· Siemens
95%
4.3 ≤ v < 6.4All versions >= V4.3 and < V6.4
Affected range stops below 6.4, so it looks safe — our inference, not a vendor statement
Scalance Sc622-2c Firmware· Siemens
95%
v ≤ 2.02.1 ≤ v < 2.1.3
Affected range stops below 2.1.3, so it looks safe — our inference, not a vendor statement
siemens-scalance-sc622-2c (same device)
Scalance Sc632-2c Firmware· Siemens
95%
v ≤ 2.02.1 ≤ v < 2.1.3
Affected range stops below 2.1.3, so it looks safe — our inference, not a vendor statement
siemens-scalance-sc632-2c (same device)
Scalance Sc636-2c Firmware· Siemens
95%
v ≤ 2.02.1 ≤ v < 2.1.3
Affected range stops below 2.1.3, so it looks safe — our inference, not a vendor statement
siemens-scalance-sc636-2c (same device)
Scalance Sc642-2c Firmware· Siemens
95%
v ≤ 2.02.1 ≤ v < 2.1.3
Affected range stops below 2.1.3, so it looks safe — our inference, not a vendor statement
siemens-scalance-sc642-2c (same device)
Scalance Sc646-2c Firmware· Siemens
95%
v ≤ 2.02.1 ≤ v < 2.1.3
Affected range stops below 2.1.3, so it looks safe — our inference, not a vendor statement
siemens-scalance-sc646-2c (same device)
Scalance X300WG Firmware· Siemens
95%
v < 4.1
Affected range stops below 4.1, so it looks safe — our inference, not a vendor statement
siemens-scalance-x300wg (same device)
Scalance Xb 200 Firmware· Siemens
95%
v < 4.1All versions < V4.1
Affected range stops below 4.1, so it looks safe — our inference, not a vendor statement
siemens-scalance-xb-200 (same device)

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (2)

x_refsource_MISCPatchVendor Advisory
Source: [email protected]
https://cert-portal.siemens.com/productcert/pdf/ssa-979775.pdf
x_refsource_MISCPatchThird Party AdvisoryUS Government Resource
Source: [email protected]
https://us-cert.cisa.gov/ics/advisories/icsa-21-068-03

SSVC — Action Prioritization

SSVCNo known exploitNot automatableTotal impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

8.8HIGH[email protected]
Attack Vector
ADJACENT_NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
HIGH
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-121CWE-787

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