CVE-2026-4254 Details
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.
A stack-based buffer overflow vulnerability has been identified in the Tenda AC8 router, affecting versions through 16.03.50.11. The issue arises in the 'fromSysToolChangePwd' function within the embedded web server's HTTP endpoint '/goform/SysToolChangePwd'. The vulnerability is triggered by an unbounded copy of the 'sys.userpass' value into a fixed-size 36-byte stack buffer. This overflow corrupts the saved frame pointer and return address, allowing for remote code execution. The binary lacks stack canaries and is not position-independent, enabling precise control over the return address for exploitation.
Metrics
CVSS 4.0 Severity and Vector Strings:
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
CISA-ADP
Assessed Mar 16, 2026References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://github.com/digitalandrew/tenda_ac8_v5/blob/main/CVE_Report_Tenda_AC8_SysToolChangePwd_BOF.md | [email protected] | ExploitThird Party Advisory |
| https://vuldb.com/?ctiid.351212 | [email protected] | Permissions RequiredVDB Entry |
| https://vuldb.com/?id.351212 | [email protected] | Third Party AdvisoryVDB Entry |
| https://vuldb.com/?submit.771773 | [email protected] | Third Party AdvisoryVDB Entry |
| https://www.tenda.com.cn/ | [email protected] | Product |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-787 | Out-of-bounds Write | [email protected] |
| CWE-119 | Improper Restriction of Operations within the Bounds of a Memory Buffer | [email protected] |
| CWE-121 | Stack-based Buffer Overflow | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| tenda ac8 firmware | <= 16.03.50.11 |
CPE
Remediation
| |
| tenda ac8 | 5.0 |
CPE
Remediation
| |
Change History
4 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jun 17, 2026 | CVE Modified | [email protected] |
| Jun 17, 2026 | CVE Modified | CISA-ADP |
| Mar 20, 2026 | Initial Analysis | [email protected] |
| Mar 16, 2026 | New CVE Received | [email protected] |