CVE-2026-91191— Lantronix G520 Series Cellular Gateway Improper Verification of Cryptographic Signature
Quick assessment
Affected
Lantronix G520 Series
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
The device's update mechanism includes conditions that allow unauthorized software packages to be accepted as authentic. During the boot process, the stock done function disables signature verification in the OPKG configuration before restoring optional packag
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I. Basic Information for CVE-2026-91191
Vulnerability Information
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Vulnerability Title
Lantronix G520 Series Cellular Gateway Improper Verification of Cryptographic Signature
Source: CVE Program / CVE List V5
Vulnerability Description
The device's update mechanism includes conditions that allow unauthorized software packages to be accepted as authentic. During the boot process, the stock done function disables signature verification in the OPKG configuration before restoring optional packages from a writable, unsigned feed. Separately, the publicly distributed SDK contains the production private key whose corresponding public key is trusted by both stable and beta firmware builds. Either issue undermines package authenticity, and together they allow an attacker to provide packages that appear valid to the system. Even if signature enforcement is restored, the exposed production key enables an attacker to generate signatures that the device will continue to trust. An attacker who can supply a malicious package may be able to execute arbitrary code with root privileges during installation.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
密码学签名的验证不恰当
Source: CVE Program / CVE List V5
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| Lantronix | G520 Series | 2.6.0.4R6 stable | - |
|
II. Public POCs for CVE-2026-91191
| # | POC Description | Source Link | Shenlong Link |
|---|
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Other References for CVE-2026-91191 (4)
IV. Related Vulnerabilities
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Same weakness: CWE-347
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V. Comments for CVE-2026-91191
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