What is CVE-2026-4254?

CVE-2026-4254 is a critical-severity vulnerability in Tenda Ac8, classified under Stack-based Buffer Overflow. CVSS score: 9.8/10. Published 2026-03-16.

How severe is CVE-2026-4254?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Buffer overflow in Tenda Ac8

CVE-2026-4254

A weakness has been identified in Tenda AC8 up to 16.03.50.11. This vulnerability affects the function doSystemCmd of the file /goform/SysToolChangePwd of the component HTTP Endpoint. This manipulation of the argument local_2c causes stack…

Vulnerability class: Buffer Overflow

EPSS: 0.002 (47.1th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:P/RL:X/RC:R.

Affected products

Tenda Ac8 — versions 16.03.50.0, 16.03.50.1, 16.03.50.2

Weakness classification (CWE)

References

VDB-351212 | Tenda AC8 HTTP Endpoint SysToolChangePwd doSystemCmd stack-based overflow (vdb-entry, technical-description)
VDB-351212 | CTI Indicators (IOB, IOC, IOA) (signature, permissions-required)
Submit #771773 | Tenda AC8 V5 V16.03.50.11 Buffer Overflow (third-party-advisory)
github.com/digitalandrew/tenda_ac8_v5/blob/main/CVE_Report_Tenda_AC8_SysToolCha… (exploit)
www.tenda.com.cn/ (product)

Frequently asked questions

What is CVE-2026-4254?: CVE-2026-4254 is a critical-severity vulnerability in Tenda Ac8, classified under Stack-based Buffer Overflow. CVSS score: 9.8/10. Published 2026-03-16.
How severe is CVE-2026-4254?: Critical severity. CVSS v3 base score is 9.8 out of 10.