CVE-2018-25029Public exploit

Traffic interception and spoofing via pairing downgrade

Published Feb 4, 2022 · Updated Sep 17, 2024

Algorithm downgrade in Silicon Labs Z-Wave S2 allows physically proximate attackers to intercept and spoof network traffic during pairing. An unauthenticated Node Info frame advertises supported command classes, so a forged frame can remove COMMAND_CLASS_SECURITY_2 and force S0 pairing. The attacker must be within radio range during pairing and know the node home ID; the exposed S0 key permits later traffic interception and device-command injection.

CVSS severity8.1
High
EPSS probability0.62%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Algorithm downgrade in Silicon Labs Z-Wave S2 allows physically proximate attackers to intercept and spoof network traffic during pairing. An unauthenticated Node Info frame advertises supported command classes, so a forged frame can remove COMMAND_CLASS_SECURITY_2 and force S0 pairing. The attacker must be within radio range during pairing and know the node home ID; the exposed S0 key permits later traffic interception and device-command injection.

The record

CVE
CVE-2018-25029
Published
Feb 4, 2022
Updated
Sep 17, 2024
Vendor
Sigma Designs
Product
Z-Wave
Classifications
CWE-757, T1557
Attack vector
adjacent
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 4, 2022CVE publishedPublication date reported by the CVE source.
  2. Sep 17, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=S2

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesunauthenticated

What is affected?

Sigma Designs · Z-Waveversion=S2

Published CVSS scores

4.8NIST NVDAV:A/AC:L/Au:N/C:P/I:P/A:N
8.1NIST NVDCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectoradjacent
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-757Selection of Less-Secure Algorithm During Negotiation ('Algorithm Downgrade')
T1557Adversary-in-the-Middle

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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