CVE-2023-43478: Unauthenticated configuration restore and firmware update

Severity: critical (CVSS 9.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 18.0% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2023-09-20 · updated 2026-06-17
Weakness: CWE-434

Description

fake_upload.cgi on the Telstra Smart Modem Gen 2 (Arcadyan LH1000), firmware versions < 0.18.15r, allows unauthenticated attackers to upload firmware images and configuration backups, which could allow them to alter the firmware or the configuration on the device, ultimately leading to code execution as root.

Affected products

Telstra Smart Modem Gen 2 (Arcadyan LH1000): before 0.18.15r — fixed in 0.18.15r

How to fix

Upgrade to a fixed version: Telstra Smart Modem Gen 2 (Arcadyan LH1000) 0.18.15r. Check the vendor advisory for mitigations.

References

https://www.tenable.com/security/research/tra-2023-19
https://www.tenable.com/security/research/tra-2023-19

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