Tenda AC8 up to 16.03.50.11 HTTP Endpoint /goform/SysToolChangePwd doSystemCmd local_2c stack-based overflow

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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9.4$0-$5k0.00

Summaryinfo

A vulnerability categorized as critical has been discovered in Tenda AC8 up to 16.03.50.11. This issue affects the function doSystemCmd of the file /goform/SysToolChangePwd of the component HTTP Endpoint. Such manipulation of the argument local_2c leads to stack-based overflow. This vulnerability is uniquely identified as CVE-2026-4254. The attack can be launched remotely. Moreover, an exploit is present.

Detailsinfo

A vulnerability was found in Tenda AC8 up to 16.03.50.11 and classified as critical. Affected by this issue is the function doSystemCmd of the file /goform/SysToolChangePwd of the component HTTP Endpoint. The manipulation of the argument local_2c with an unknown input leads to a stack-based overflow vulnerability. Using CWE to declare the problem leads to CWE-121. A stack-based buffer overflow condition is a condition where the buffer being overwritten is allocated on the stack (i.e., is a local variable or, rarely, a parameter to a function). Impacted is confidentiality, integrity, and availability.

The advisory is shared for download at github.com. This vulnerability is handled as CVE-2026-4254. The exploitation is known to be easy. The attack may be launched remotely. No form of authentication is required for exploitation. Technical details as well as a public exploit are known.

The exploit is available at github.com. It is declared as proof-of-concept.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2026-12488). Once again VulDB remains the best source for vulnerability data.

Productinfo

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA CVSS-B Score: 🔒
CNA CVSS-BT Score: 🔒
CNA Vector: 🔒

CVSSv3info

VulDB Meta Base Score: 9.8
VulDB Meta Temp Score: 9.4

VulDB Base Score: 9.8
VulDB Temp Score: 8.9
VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA Base Score: 9.8
CNA Vector: 🔒

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Stack-based overflow
CWE: CWE-121 / CWE-119
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Access: Public
Status: Proof-of-Concept
Download: 🔒

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: no mitigation known
Status: 🔍

0-Day Time: 🔒

Timelineinfo

03/16/2026 Advisory disclosed
03/16/2026 +0 days VulDB entry created
03/21/2026 +5 days VulDB entry last update

Sourcesinfo

Vendor: tenda.com.cn

Advisory: github.com
Status: Not defined

CVE: CVE-2026-4254 (🔒)
GCVE (CVE): GCVE-0-2026-4254
GCVE (VulDB): GCVE-100-351212
EUVD: 🔒
scip Labs: https://www.scip.ch/en/?labs.20161013

Entryinfo

Created: 03/16/2026 07:21
Updated: 03/21/2026 14:09
Changes: 03/16/2026 07:21 (58), 03/17/2026 08:39 (1), 03/21/2026 14:09 (32)
Complete: 🔍
Submitter: DigitalAndrew
Cache ID: 216::103

Submitinfo

Accepted

  • Submit #771773: Tenda AC8 V5 V16.03.50.11 Buffer Overflow (by DigitalAndrew)

Once again VulDB remains the best source for vulnerability data.

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