Tenda G0
CVE-2026-36799
HIGH
Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata – not a confirmed exploit chain
-
AccessIdentify exposed Tenda G0 httpd
-
DeliveryCraft HTTP request with oversized portalAuth
-
ExploitSend request to formPortalAuth endpoint
-
ExecutionOverflow fixed-size buffer
-
PersistCrash httpd / reboot router
-
ImpactManagement plane unavailable
Vulnerability Assessment
| Weakness |
CWE
ASVS 5.0
V15 - Secure Coding and Architecture Buffer copy size validation
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. |
| Exploitation Conditions | The attacker needs network reachability to the HTTP service that exposes the formPortalAuth endpoint on a Tenda G0 router running firmware 15.11.0.5, and the captive-portal/portal-authentication code path must be reachable (typically the LAN-side or guest-network web interface; WAN-side reachability depends on whether remote management has been enabled, which is not the default). No authentication is required (CVSS PR:N) and no user interaction is needed (UI:N). Limiting factors: only Tenda G0 model on the specific firmware version is confirmed affected, exploitation yields only availability impact (no code execution or data disclosure has been demonstrated), and reach to the management interface from the Internet generally requires the operator to have enabled remote admin or exposed the device directly. |
| Impact | Signals are mixed but converge on moderate, not urgent, priority. CVSS 7.5 (AV:N/AC:L/PR:N/UI:N/A:H) reflects a trivially reachable network DoS with no confidentiality or integrity impact, which is consistent with the described buffer overflow crashing the HTTP service. EPSS of 0.01% (2nd percentile) and absence from CISA KEV indicate no observed mass exploitation, and the only reference is an academic-style LLM-vuln-research repository rather than weaponized exploit code. Net real-world risk: low-to-moderate for Internet-exposed Tenda G0 devices (availability loss only), higher only where the router is mission-critical and the management interface is reachable from untrusted networks. Note that the CPE field is a generic 'n/a:n/a' placeholder, so automated asset matching tools will not flag this CVE - defenders must match by vendor/model manually. |
| Exploit ScenarioDerived | An attacker with network reach to the Tenda G0 router's web management or captive-portal interface sends a single HTTP request whose portalAuth parameter contains an oversized payload, triggering the buffer overflow in formPortalAuth and crashing the httpd process. The device's management plane becomes unavailable and, depending on watchdog behavior, the router may reboot - disrupting connectivity for downstream users. A public proof-of-concept research repository documents the vulnerable function, lowering the effort needed to reproduce the crash. |
Get an e-mail when this CVE is exploited, patched or re-scored. Free account.
Alert meAnalysisAIv1 – Jun 10, 2026
Denial of service in Tenda G0 router firmware v15.11.0.5 allows remote unauthenticated attackers to crash the device by sending a crafted HTTP request that overflows the portalAuth parameter handled by the formPortalAuth function. No public exploit is identified at time of analysis and EPSS exploitation probability is very low (0.01%), but a public proof-of-concept research repository on GitHub references the vulnerable function.
RemediationAI
No vendor-released patch identified at time of analysis and no Tenda advisory is linked in the available references, so monitor https://www.tendacn.com/ for a firmware release that supersedes 15.11.0.5 and apply it once published. As compensating controls, restrict access to the router's HTTP management/portal interface to a trusted management VLAN or specific admin IPs via the device ACL, and ensure WAN-side administration is disabled (default on most Tenda models) - trade-off is loss of remote administration convenience. If the captive-portal authentication feature is not in use, disable it to remove the formPortalAuth attack surface entirely; the side effect is loss of portal-based guest auth. Place the device behind an upstream firewall that drops unsolicited inbound HTTP to the router's management ports, and monitor for repeated httpd crashes/reboots as an indicator of exploitation attempts. Reference research material: https://github.com/xhh0124/SemVulLLM/tree/main/G0/formPortalAuth.
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 Tenda G0 is a small-business VPN router whose embedded HTTP management/portal interface exposes the formPortalAuth handler. The flaw is a classic CWE-120 classic buffer copy without checking size of input: the portalAuth parameter taken from an HTTP request is copied into a fixed-size stack or heap buffer without bounds validation, leading to memory corruption. Because the affected component is a C-based embedded web server on MIPS/ARM firmware (typical Tenda architecture), corrupting the stack reliably crashes the httpd process and, by extension, the router's management plane. The supplied CPE string (cpe:2.3:a:n/a:n/a) is a placeholder and does not encode the actual product; the description is the authoritative source for affected firmware.
Know when N A 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:N/I:N/A:H
Network-reachable HTTP endpoint, no auth or interaction, single crafted request triggers the overflow; impact is availability only (service crash), no confidentiality or integrity loss.
Primary rating from Vendor (mitre).
CVSS VectorVendor: mitre
Lifecycle Timeline
2DescriptionCVE.org
Shenzhen Tenda Technology Co., Ltd Tenda G0 v15.11.0.5 was discovered to contain a buffer overflow in the portalAuth parameter of the formPortalAuth function. This vulnerability allows attackers to cause a Denial of Service (DoS) via a crafted HTTP request.
Executive ViewAI
Tenda G0 router firmware v15.11.0.5 contains a denial of service vulnerability allowing remote attackers to crash affected devices and disrupt network connectivity. Organizations using this specific firmware version face immediate network outage risk with no vendor patch available. Rapid inventory and mitigation planning are required to restore operational resilience.
No vendor-released patch identified at time of analysis. Interim mitigations: (1) Deploy firewall access control lists to restrict inbound HTTP/HTTPS traffic to the router, (2) Implement network segmentation to isolate the device from critical infrastructure, (3) Configure IDS/IPS signatures to detect and alert on malformed HTTP requests to the portalAuth function, (4) Enable device access logging with alerting on suspicious HTTP activity, (5) Establish hardware replacement timeline for 30-day remediation target.
Threat Intelligence Overview
NVD
CVE.org
EPSS
Vulnrichment
GitHub
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.
Denial of Service attacks render applications or systems unavailable by overwhelming resources or triggering failure conditions.
Affected Products (CPE)CVE.org
LibreNMS before 24.10.0 allows a remote attacker to execute arbitrary code via OS command injection involving AboutContr
Reachable assertion in Open5GS up to version 2.7.6 allows remote unauthenticated attackers to crash the Diameter CER han
A Command Injection issue in the payload build page in BYOB (Build Your Own Botnet) 2.0 allows attackers to execute arbi
Denial of service in Open5GS 2.7.6 and earlier allows network-adjacent attackers with low-privilege Diameter Gx peer acc
Denial of service in Open5GS HSS (Home Subscriber Server) versions 2.7.0 through 2.7.6 is triggered remotely by manipula
Remote command injection in Control Web Panel allows unauthenticated attackers to execute arbitrary OS commands as root
LINQPad before 5.52.01 Pro edition is vulnerable to Unsafe Deserialization in LINQPad.AutoRefManager::PopulateFromCache(
Remote code execution in dash-uploader (Python package for Plotly Dash) versions 0.1.0 through 0.7.0a2 allows unauthenti
Command injection in LiteLLM 1.18.10 lets attackers who can configure MCP (Model Context Protocol) servers supply arbitr
SQL injection in AzuraCast's backup restore flow (versions up to and including 0.23.7) lets an attacker achieve privileg
Arbitrary file read in Yu AI Code Mother v4.3 lets anonymous, remote attackers retrieve files outside the intended previ
Remote code execution in APScheduler (all versions through 3.10.x and 4.0.0a5) is achievable when applications deseriali
Exploit-DB