Vulnerability · Published Mar 16, 2026 · Assigned by VulDB

CVE-2026-4254Tenda AC8 HTTP Endpoint SysToolChangePwd doSystemCmd stack-based overflow

Critical 9.8

In plain English

A critical-severity stack buffer overflow in AC8 from Tenda. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.9% (higher than 61% of all known vulnerabilities).

Severity (CVSS 3.1)9.8Critical

Exploit odds (30 days)0.9%top 39.5% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official description

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-based buffer overflow. The attack can be initiated remotely. The exploit has been made available to the public and could be used for attacks.

Affected products (as reported)

Vendor	Product	Versions
Tenda	AC8	16.03.50.016.03.50.116.03.50.216.03.50.316.03.50.416.03.50.516.03.50.616.03.50.7

Weakness: CWE-121, CWE-119 · 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

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
https://github.com/digitalandrew/tenda_ac8_v5/blob/main/CVE_Report_Tenda_AC8_SysToolChangePwd_BOF.md exploit
https://www.tenda.com.cn/ product