How severe is CVE-2023-40797?

CVE-2023-40797 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-2023-40797 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-2023-40797?

CVE-2023-40797 affects Tenda Ac23 Firmware. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2023-40797?

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-2023-40797 published?

CVE-2023-40797 was published on 2023-08-25 and last updated on 2026-06-17.

CVE-2023-40797

CVE-2023-40797 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 sub_4781A4 function does not validate the parameters entered by the user, resulting in a post-authentication stack overflow vulnerability.

Frequently asked questions

What is CVE-2023-40797?: In Tenda AC23 v16.03.07.45_cn, the sub_4781A4 function does not validate the parameters entered by the user, resulting in a post-authentication stack overflow vulnerability.
How severe is CVE-2023-40797?: CVE-2023-40797 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-2023-40797 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-2023-40797?: CVE-2023-40797 affects Tenda Ac23 Firmware. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2023-40797?: 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-2023-40797 published?: CVE-2023-40797 was published on 2023-08-25 and last updated on 2026-06-17.

References

https://github.com/lst-oss/Vulnerability/tree/main/Tenda/AC23/sub_4781A4

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…
CVE-2023-40799 — Critical (CVSS 9.8): Tenda AC23 Vv16.03.07.45_cn is vulnerable to Buffer Overflow via sub_450A4C function.
CVE-2022-43108 — Critical (CVSS 9.8): Tenda AC23 V16.03.07.45_cn was discovered to contain a stack overflow via the firewallEn parameter in the…
CVE-2022-43107 — Critical (CVSS 9.8): Tenda AC23 V16.03.07.45_cn was discovered to contain a stack overflow via the time parameter in the…
CVE-2022-43106 — Critical (CVSS 9.8): Tenda AC23 V16.03.07.45_cn was discovered to contain a stack overflow via the schedStartTime parameter in the…
CVE-2022-43105 — Critical (CVSS 9.8): Tenda AC23 V16.03.07.45_cn was discovered to contain a stack overflow via the shareSpeed parameter in the…

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