by Kastro
Paper/Archive/CVE-2026-28742

CVE-2026-28742

Naxclow Smart Doorbell X3 — Naxclow IoT Platform Use of hard-coded cryptographic key

EPSS 0.3%CVSS 9.8
critical.is priorityof 100
35
CVSS 9.8 (CNA)9.8 / 10 × 3029.4Not in CISA KEV+300.0EPSS percentile 26.2.262 × 205.2No public exploit+100.0SSVC exploitation: none+100.0
Description · from the CVE record

Naxclow devices use a uniform request-signing scheme based on a hard-coded, platform-wide salt embedded in every firmware image. Once this salt is recovered from any device, an attacker can generate valid signatures for arbitrary device or account operations due to the absence of per-device keys, server-side nonce tracking, or replay protections. Combined with the system’s use of plain HTTP for control-plane traffic, the construction enables broad request forgery and impersonation across the platform.

Affected

ProductAffectedFixed inSource
Smart Doorbell X3All–CNA
X Smart HomeAll–CNA
V720All–CNA
ix camAll–CNA

Scores by source

icscert (CNA)9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
icscert (CNA)9.2CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
CISA ADPSSVCExploitation: none · Automatable: yes · Technical impact: total

References

refcisa.gov/news-events/ics-advisories/icsa-26-162-02refgithub.com/cisagov/CSAF/blob/develop/csaf_files/OT/white/2026/icsa-26-162-02.json