CVE-2026-32958Network attack vector

Firmware tampering via hard-coded signing key

Published Apr 20, 2026 · Updated Apr 20, 2026

Hard-coded firmware signing keys in Silex SD-330AC 1.42 and earlier and AMC Manager 5.0.2 and earlier allow attackers to forge updates. The firmware update verifier accepts attacker-modified firmware as legitimate when it is signed with the embedded key; public materials do not identify the verification routine. Exploitation requires obtaining the key and directing an administrative user to apply the forged firmware, enabling unauthorized firmware modification.

CVSS severity6.9
Medium
EPSS probability0.23%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Hard-coded firmware signing keys in Silex SD-330AC 1.42 and earlier and AMC Manager 5.0.2 and earlier allow attackers to forge updates. The firmware update verifier accepts attacker-modified firmware as legitimate when it is signed with the embedded key; public materials do not identify the verification routine. Exploitation requires obtaining the key and directing an administrative user to apply the forged firmware, enabling unauthorized firmware modification.

The record

CVE
CVE-2026-32958
Published
Apr 20, 2026
Updated
Apr 20, 2026
Vendor
Silex Technology
Product
SD-330AC
Classifications
CWE-321, T1601.001
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 20, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 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=Ver.1.42 and earlier

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Silex Technology · SD-330ACversion=Ver.1.42 and earlier
Silex Technology · AMC Managerversion=Ver.5.0.2 and earlier

Published CVSS scores

6.5JPCERT/CCCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N
6.9JPCERT/CCCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:H/VA:N/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)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-321Use of Hard-coded Cryptographic Key
T1601.001Patch System Image

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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