How severe is CVE-2023-40798?

CVE-2023-40798 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2023-40798 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (52nd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2023-40798?

CVE-2023-40798 affects Tenda Ac23 Firmware. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2023-40798?

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-2023-40798 published?

CVE-2023-40798 was published on 2023-08-25 and last updated on 2026-06-17.

CVE-2023-40798

CVE-2023-40798 is a high-severity vulnerability in Tenda Ac23 Firmware with a CVSS 3.x base score of 8.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-20.

Key facts

Severity: High (CVSS 3.x base score 8.8)
EPSS exploit prediction: 1% (52nd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-20
Affected product: Tenda Ac23 Firmware
Published: 2023-08-25
Last modified: 2026-06-17

Description

In Tenda AC23 v16.03.07.45_cn, the formSetIPv6status and formGetWanParameter functions do not authenticate user input parameters, resulting in a post-authentication stack overflow vulnerability.

Frequently asked questions

What is CVE-2023-40798?: In Tenda AC23 v16.03.07.45_cn, the formSetIPv6status and formGetWanParameter functions do not authenticate user input parameters, resulting in a post-authentication stack overflow vulnerability.
How severe is CVE-2023-40798?: CVE-2023-40798 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2023-40798 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (52nd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2023-40798?: CVE-2023-40798 affects Tenda Ac23 Firmware. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2023-40798?: 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-2023-40798 published?: CVE-2023-40798 was published on 2023-08-25 and last updated on 2026-06-17.

References

https://github.com/lst-oss/Vulnerability/tree/main/Tenda/AC23/formSetIPv6status-formGetWanParameter

Affected products (1)

cpe:2.3:o:tenda:ac23_firmware:16.03.07.45_cn:*:*:*:*:*:*:*

More vulnerabilities in Tenda Ac23 Firmware

CVE-2025-9605 — Critical (CVSS 9.8): A security vulnerability has been detected in Tenda AC21 and AC23 16.03.08.16. Affected is the function…
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