How severe is CVE-2023-43478?

CVE-2023-43478 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over an adjacent network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2023-43478 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 17% (97th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2023-43478?

CVE-2023-43478 affects Telstra Arcadyan Lh1000 Firmware. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2023-43478?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2023-43478 published?

CVE-2023-43478 was published on 2023-09-20 and last updated on 2026-06-17.

CVE-2023-43478

CVE-2023-43478 is a high-severity vulnerability in Telstra Arcadyan Lh1000 Firmware with a CVSS 3.x base score of 8.8. Its EPSS exploit-prediction score of 17% places it in the 97th percentile, indicating an elevated likelihood of exploitation. The underlying weakness is classified as CWE-434.

Key facts

Severity: High (CVSS 3.x base score 8.8)
EPSS exploit prediction: 17% (97th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-434
Affected product: Telstra Arcadyan Lh1000 Firmware
Published: 2023-09-20
Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2023-43478?: 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.
How severe is CVE-2023-43478?: CVE-2023-43478 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over an adjacent network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2023-43478 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 17% (97th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2023-43478?: CVE-2023-43478 affects Telstra Arcadyan Lh1000 Firmware. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2023-43478?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2023-43478 published?: CVE-2023-43478 was published on 2023-09-20 and last updated on 2026-06-17.

References

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

Affected products (1)

cpe:2.3:o:telstra:arcadyan_lh1000_firmware:*:*:*:*:*:*:*:*

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