How severe is CVE-2023-40837?

CVE-2023-40837 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2023-40837 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (53rd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2023-40837?

CVE-2023-40837 affects Tenda Ac6 Firmware. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2023-40837?

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

When was CVE-2023-40837 published?

CVE-2023-40837 was published on 2023-08-30 and last updated on 2026-06-17.

CVE-2023-40837

CVE-2023-40837 is a critical-severity vulnerability in Tenda Ac6 Firmware with a CVSS 3.x base score of 9.8. 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-78.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
EPSS exploit prediction: 1% (53rd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-78
Affected product: Tenda Ac6 Firmware
Published: 2023-08-30
Last modified: 2026-06-17

Description

Tenda AC6 US_AC6V1.0BR_V15.03.05.16_multi_TD01.bin function 'sub_ADD50' contains a command execution vulnerability. In the "formSetIptv" function, obtaining the "list" and "vlanId" fields, unfiltered passing these two fields as parameters to the "sub_ADD50" function to execute commands.

Frequently asked questions

What is CVE-2023-40837?: Tenda AC6 US_AC6V1.0BR_V15.03.05.16_multi_TD01.bin function 'sub_ADD50' contains a command execution vulnerability. In the "formSetIptv" function, obtaining the "list" and "vlanId" fields, unfiltered passing these two fields as parameters to the "sub_ADD50" function to execute commands.
How severe is CVE-2023-40837?: CVE-2023-40837 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2023-40837 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (53rd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2023-40837?: CVE-2023-40837 affects Tenda Ac6 Firmware. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2023-40837?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2023-40837 published?: CVE-2023-40837 was published on 2023-08-30 and last updated on 2026-06-17.

References

https://github.com/XYIYM/Digging/blob/main/Tenda/AC6/cmd/2/2.md

Affected products (1)

cpe:2.3:o:tenda:ac6_firmware:15.03.05.16:*:*:*:*:*:*:*

More vulnerabilities in Tenda Ac6 Firmware

CVE-2025-52221 — Critical (CVSS 9.8): Tenda AC6 15.03.05.16_multi is vulnerable to Buffer Overflow in the formSetCfm function via the funcname, funcpara1,…
CVE-2025-27129 — Critical (CVSS 9.8): An authentication bypass vulnerability exists in the HTTP authentication functionality of Tenda AC6 V5.0 V02.03.01.110.…
CVE-2025-29031 — Critical (CVSS 9.8): Tenda AC6 v15.03.05.16 was discovered to contain a buffer overflow via the fromAddressNat function.
CVE-2025-29030 — Critical (CVSS 9.8): Tenda AC6 v15.03.05.16 was discovered to contain a buffer overflow via the formWifiWpsOOB function.
CVE-2025-29029 — Critical (CVSS 9.8): Tenda AC6 v15.03.05.16 was discovered to contain a buffer overflow via the formSetSpeedWan function.
CVE-2025-25343 — Critical (CVSS 9.8): Tenda AC6 V15.03.05.16 firmware has a buffer overflow vulnerability in the formexeCommand function.

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