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NVD / CVE Program· CNA siemens

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)…

Noroxi assessment

Priority: Monitor (action score 35/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.94% (FIRST EPSS); higher than 61.3% of all records.
  • Someone on the same network segment can trigger it. No account or password is required. No user action is required. No special conditions are required; it is repeatable.
  • According to the record, no fixed version is available yet.

Low priority for now. Update when a fix is released; follow the vendor's advisory.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

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.

HighCVSS 8.8 · v3.1—No exploit No fix recorded
Published
Mar 15, 2021
Updated
Jun 16, 2026
EPSS
0.9% · 61th percentile

Report tools

JSON

Action score

35

Monitor

Low priority for now.

CVSS
35 / 40 · 8.8 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.9%

CISA SSVC decision

Exploitation
none
Automatable
no
Technical impact
total

Vulnrichment: CISA's decision-tree inputs.

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • No fixed version yet

If any of these changes, we'll tell you in the daily email digest.

Follow CVE-2021-25667

When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
siemensruggedcom rm1224 firmware
siemensruggedcom rm1224
siemensscalance m-800 firmware
siemensscalance m-800
siemensscalance s615 firmware
siemensscalance s615
siemensscalance x300wg firmware
siemensscalance x300wg
siemensscalance xm400 firmware
siemensscalance xm400
siemensscalance xr500 firmware
siemensscalance xr500

and 18 more

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • siemens ruggedcom rm1224 firmware4.3 and later · before 6.4
  • siemens scalance m-800 firmware4.3 and later · before 6.4
  • siemens scalance s615 firmware4.3 and later · before 6.4
  • siemens scalance sc622-2c firmware2.1 and later · before 2.1.3
  • siemens scalance sc622-2c firmwareup to 2.0 inclusive
  • siemens scalance sc632-2c firmware2.1 and later · before 2.1.3
  • siemens scalance sc632-2c firmwareup to 2.0 inclusive
  • siemens scalance sc636-2c firmwareup to 2.0 inclusive
  • siemens scalance sc636-2c firmware2.1 and later · before 2.1.3
  • siemens scalance sc642-2c firmwareup to 2.0 inclusive
  • siemens scalance sc642-2c firmware2.1 and later · before 2.1.3
  • siemens scalance sc646-2c firmwareup to 2.0 inclusive
  • siemens scalance sc646-2c firmware2.1 and later · before 2.1.3
  • siemens scalance x300wg firmwarebefore 4.1
  • siemens scalance xb-200 firmwarebefore 4.1
  • siemens scalance xc-200 firmwarebefore 4.1
  • siemens scalance xf-200ba firmwarebefore 4.1
  • siemens scalance xm400 firmwarebefore 6.2
  • siemens scalance xp-200 firmwarebefore 4.1
  • siemens scalance xr500 firmwarebefore 6.2

Versions reported by the vendor

Affected version ranges reported by the assigning authority (siemens). Independent of NVD's CPE analysis and usually ahead of it.

  • Siemens RUGGEDCOM RM1224

    • All versions >= V4.3 and < V6.4affected

  • Siemens SCALANCE M-800

    • All versions >= V4.3 and < V6.4affected

  • Siemens SCALANCE S615

    • All versions >= V4.3 and < V6.4affected

  • Siemens SCALANCE SC-600 Family

    • All versions >= V2.0 and < V2.1.3affected

  • Siemens SCALANCE XB-200

    • All versions < V4.1affected

  • Siemens SCALANCE XC-200

    • All versions < V4.1affected

  • Siemens SCALANCE XF-200BA

    • All versions < V4.1affected

  • Siemens SCALANCE XM400

    • All versions < V6.2affected

  • Siemens SCALANCE XP-200

    • All versions < V4.1affected

  • Siemens SCALANCE XR-300WG

    • All versions < V4.1affected

  • Siemens SCALANCE XR500

    • All versions < V6.2affected

Same product

siemens: all records

Other highest-scoring records for the same primary product.

  • CVE-2022-31766A vulnerability has been identified in RUGGEDCOM RM1224 LTE(4G) EU (6GK6108-4AM00-2BA2) (All versions < V7.1.2), RUGGEDCOM RM1224 LTE(4G)…
    34Monitor
  • CVE-2021-25676A vulnerability has been identified in RUGGEDCOM RM1224 (V6.3), SCALANCE M-800 (V6.3), SCALANCE S615 (V6.3), SCALANCE SC-600 (All Versions…
    30Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

No fix version is recorded for this entry. Check the references for vendor advisories.

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

No history yet (it accumulates with the daily EPSS job).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Someone on the same network segment can trigger it.
  • No account or password is required.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
high · data can be read
Integrity
high · data or configuration can be modified
Availability
high · the service can be disrupted
Attack vector
Adjacent
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality impact
High
Integrity impact
High
Availability impact
High

Weakness class (CWE)

CWE-121 · Stack-based Buffer Overflow

CVSS vector

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

nvd-primary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Change log

No changes recorded on tracked fields yet. Score, KEV, exploit maturity and fix status changes appear here.

References

Show all references (1 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records