CVE-2025-9791

Tenda Ac20 Firmware buffer overflow

8.8 HIGHPublic exploitEPSS 0.85%

Published1 Sept 2025

Description

A weakness has been identified in Tenda AC20 16.03.08.05. This vulnerability affects unknown code of the file /goform/fromAdvSetMacMtuWan. This manipulation of the argument wanMTU causes stack-based buffer overflow. Remote exploitation of the attack is possible. The exploit has been made available to the public and could be exploited.

CVSS 3.1 breakdown

Attack vectorNetwork

Attack complexityLow

Privileges requiredLow

User interactionNone

ScopeUnchanged

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected products

Tenda Ac20 Firmware16.03.08.5

Remediation

No fixed version is recorded in the NVD data. Check the vendor advisory for the latest guidance.

References

https://github.com/Cpppq43/Tenda/blob/main/Tenda_AC20_V16.03.08.05.mdExploitThird Party Advisory
https://github.com/Cpppq43/Tenda/blob/main/Tenda_AC20_V16.03.08.05.md#pocExploitThird Party Advisory
https://vuldb.com/?ctiid.322106Permissions RequiredVDB Entry
https://vuldb.com/?id.322106Third Party AdvisoryVDB Entry
https://vuldb.com/?submit.641088Third Party AdvisoryVDB Entry
https://www.tenda.com.cn/Product

Related CVEs

Recent high-severity vulnerabilities sharing a weakness type.

Frequently asked

Is CVE-2025-9791 being actively exploited?

CVE-2025-9791 is not in the CISA KEV catalog. A public exploit reference exists, so treat it as exploitable. Its EPSS exploit probability is 0.85%.

How severe is CVE-2025-9791?

CVE-2025-9791 has a CVSS 3.1 base score of 8.8, rated high. EPSS estimates a 0.85% probability of exploitation.

Which products are affected by CVE-2025-9791?

Affected products include Tenda Ac20 Firmware.

How do I fix CVE-2025-9791?

Apply the vendor's patch or advisory guidance, then verify no affected versions remain across your devices.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2025-9791 against the real software inventory on every managed device, every day. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.