CVE-2025-14055

Buffer overread via Secure NCP integer underflow

Published Feb 20, 2026 · Updated Feb 20, 2026

Integer underflow in Silicon Labs Simplicity SDK allows physically proximate attackers to overread a Secure NCP host buffer. Silicon Labs has not disclosed the affected function or the exact arithmetic operation that underflows while the Secure NCP host processes the packet. Physical access to the NCP-host interface is required in releases through 2025.6.2 and 2025.12.0 through 2025.12.1; neither remote reachability nor code execution is reported.

CVSS severity2.4
Low
EPSS probability0.17%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Integer underflow in Silicon Labs Simplicity SDK allows physically proximate attackers to overread a Secure NCP host buffer. Silicon Labs has not disclosed the affected function or the exact arithmetic operation that underflows while the Secure NCP host processes the packet. Physical access to the NCP-host interface is required in releases through 2025.6.2 and 2025.12.0 through 2025.12.1; neither remote reachability nor code execution is reported.

The record

CVE
CVE-2025-14055
Published
Feb 20, 2026
Updated
Feb 20, 2026
Vendor
Sigma Designs
Product
Simplicity SDK
Classifications
CWE-125, CWE-191, CAPEC-100
Attack vector
physical
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 20, 2026CVE publishedPublication date reported by the CVE source.
  2. Feb 20, 2026Record 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=0 <=2025.12.1

What conditions does exploitation require?

Attack vectorphysical
Required privilegesunauthenticated

What is affected?

Sigma Designs · Simplicity SDKversion=0 <=2025.12.1

Published CVSS scores

2.4Silicon LabsCVSS:4.0/AV:P/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA: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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

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

Weakness, pattern, technique

CWE-125Out-of-bounds Read
CWE-191Integer Underflow (Wrap or Wraparound)
CAPEC-100Overflow Buffers

Public exploit references

No public exploit references are available in this record.

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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