Critical severity · published Mar 16, 2026
CVE-2026-4254
Tenda AC8 HTTP Endpoint SysToolChangePwd doSystemCmd stack-based overflow
9.8
CVSS
0.9%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.9% · higher than 60% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
AC
AC8 · Tenda
16.03.50.0; 16.03.50.1; 16.03.50.2; 16.03.50.3; 16.03.50.4; 16.03.50.5; +6 more · source: vendor
AF
Ac8 Firmware · Tenda
through 16.03.50.11 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-4254
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-4254
Exploit
https://github.com/digitalandrew/tenda_ac8_v5/blob/main/CVE_Report_Tenda_AC8_SysToolChangePwd_BOF.md
Permissions Required
https://vuldb.com/?ctiid.351212
Third Party Advisory
https://vuldb.com/?id.351212
Third Party Advisory
https://vuldb.com/?submit.771773
Product
https://www.tenda.com.cn/
More from AC8
9.8
CVE-2026-4252
Tenda AC8 IPv6 check_is_ipv6 ip address for authentication
9.8
CVE-2025-12618
Tenda AC8 DatabaseIniSet buffer overflow
9.8
CVE-2025-4368
A vulnerability, which was classified as critical, was found in Tenda AC8 16.03.34.06
9.8
CVE-2025-29100
Tenda AC8 V16.03.34.06 is vulnerable to Buffer Overflow in the fromSetRouteStatic function via the parameter list
9.8
CVE-2025-1853
A vulnerability was found in Tenda AC8 16.03.34.06 and classified as critical