Ax3 Firmware
CVE-2025-69766
CRITICAL
Vulnerability Assessment
| Weakness |
CWE
OWASP Top 10:2025
A06:2021 - Vulnerable and Outdated Components
ASVS 5.0
V15 - Secure Coding and Architecture Stack buffer bounds checking
MITRE ATT&CK
1 technique across 1 tactic: Execution The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up. |
| Impact | CVSS 9.8 with PoC. Three separate overflows in Tenda AX3's IPTV handling suggest systemic lack of input validation in the firmware. |
| Exploit ScenarioDerived | An attacker exploits the formGetIptv overflow to gain root shell access on the Tenda AX3, then modifies DNS settings to redirect all network traffic through malicious resolvers. |
Get an e-mail when this CVE is exploited, patched or re-scored. Free account.
Alert meAnalysisAIv1 – Mar 12, 2026
Tenda AX3 firmware has a third stack-based buffer overflow in formGetIptv, allowing unauthenticated remote code execution through the router's web interface.
Earlier versions of this analysis (1)
Third stack overflow in Tenda AX3 IPTV handler enables remote code execution.
RemediationAI
Update firmware. Disable IPTV features if not used. Segment IoT/router management networks.
Affects your stack
Find out whether the stacks and servers you run are on an affected version.
Checking this CVE against your own stacks and servers is part of the Basic plan and up.
Technical ContextAI · show details
The formGetIptv function in Tenda AX3 firmware v16.03.12.11 has a CWE-121 stack-based buffer overflow due to improper handling of input parameters, the third overflow discovered in IPTV-related handlers.
Know when Ax3 Firmware gets its next vulnerability
- Watch products and get an email when something new is published
- Check this CVE against your own stack and servers
- Exploit and PoC references, threat intelligence from 22 sources
No credit card · 7-day full trial
Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Primary rating from NVD · only source for this CVE.
CVSS VectorNVD
Lifecycle Timeline
2DescriptionCVE.org
Tenda AX3 firmware v16.03.12.11 contains a stack-based buffer overflow in the formGetIptv function due to improper handling of the citytag stack buffer, which may result in memory corruption and remote code execution.
Executive ViewAI
Organizations using Tenda AX3 firmware v16.03.12.11 face critical risk from CVE-2025-69766, a stack-based buffer overflow vulnerability rated CVSS 9.8. Exploitation could allow attackers to corrupt memory, crash the application, or potentially execute arbitrary code. Proof-of-concept code is publicly available, increasing the risk of exploitation. Organizations should apply vendor updates immediately when available and implement compensating controls in the interim.
Apply vendor patch. If immediate patching is not feasible: (1) Enable ASLR and DEP where available; (2) Implement network segmentation; (3) Monitor for exploitation indicators.
Threat Intelligence Overview
NVD
CVE.org
EPSS
How this decision was reached
The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.
What every action level means
SSVC AssessmentENISA
Priority Score
Attack Technique
A buffer overflow occurs when a program writes more data to a memory buffer than it was allocated to hold, causing the excess data to spill into adjacent memory regions.
A stack-based buffer overflow occurs when a program writes more data to a buffer located on the stack than it was allocated to hold.
Memory corruption occurs when a program writes data beyond the boundaries of allocated memory regions or accesses memory in unintended ways, violating the integrity of the process's address space.
Remote Code Execution represents the critical moment when an attacker successfully runs arbitrary code on a target system without physical access.
Affected Products (CPE)CVE.org
More in Ax3 Firmware
View allTenda AX3 v16.03.12.11 was discovered to contain a remote code execution (RCE) vulnerability via the list parameter at /
Tenda AX3 firmware has a second stack overflow in formSetIptv via the vlanId parameter, allowing remote code execution t
Tenda AX3 firmware v16.03.12.11 has a stack overflow in formSetIptv via the list parameter, enabling remote attackers to
Tenda AX3 firmware has another stack-based buffer overflow in formGetIptv through a different input path, enabling remot
Tenda AX3 V16.03.12.11 was discovered to contain a Command Execution vulnerability via the function /goform/telnet. Rate
Tenda AX3 V16.03.12.11 was discovered to contain a stack overflow via the function set_device_name. Rated critical sever
Tenda AX3 V16.03.12.11 was discovered to contain a command injection vulnerability via the lanip parameter at /goform/Ad
Tenda AX3 V16.03.12.11 was discovered to contain a stack overflow via the shareSpeed parameter at /goform/WifiGuestSet.
Tenda AX3 V16.03.12.11 was discovered to contain a stack overflow via the timeType function at /goform/SetSysTimeCfg. Ra
Tenda AX3 v16.03.12.10_CN was discovered to contain a stack overflow in the function fromSetSysTime. Rated critical seve
Tenda AX3 V16.03.12.11 is vulnerable to Buffer Overflow via /goform/SetFirewallCfg. Rated high severity (CVSS 8.8), this
Tenda AX3 firmware v16.03.12.11 contains a stack overflow in formGetIptv function and the list parameter, which can caus
GitHub PoC
Exploit-DB