Tenda US_W3V1.0BR
CVE-2026-36770
HIGH
Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata – not a confirmed exploit chain
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AccessIdentify reachable Tenda US_W3V1.0BR admin interface
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DeliveryCraft HTTP request with oversized 'Go' parameter
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ExploitSend request to ask_to_reboot endpoint
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ExecutionOverflow stack buffer in handler
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PersistCrash httpd / reboot device
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ImpactNetwork outage for downstream users
Vulnerability Assessment
| Weakness |
CWE
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. |
| Exploitation Conditions | Attacker must be able to reach the HTTP management interface of a Tenda US_W3V1.0BR router running firmware v1.0.0.3 and submit a request that reaches the ask_to_reboot handler with an attacker-controlled 'Go' query parameter; no authentication is required (CVSS PR:N) and no user interaction is needed (UI:N). Exploitation is limited to deployments where the web admin interface is network-reachable from the attacker - by default this is LAN-side only, so WAN-based exploitation additionally requires that remote management has been explicitly enabled or the admin port has been forwarded. Impact is limited to denial of service (C:N/I:N/A:H) per the available data; code execution is not claimed by the reporter. |
| Impact | CVSS 7.5 reflects an unauthenticated network-reachable availability impact (AV:N/AC:L/PR:N/UI:N/A:H), which on a consumer/SOHO edge device means anyone able to reach the management interface can knock the device offline. EPSS, KEV listing, and SSVC decisions are not present in the provided intelligence, so prioritization must rely on CVSS plus exposure context: the score is inflated for organizations that do not expose router admin panels to the WAN, since most realistic attacks require LAN adjacency or a misconfigured remote-management option. KEV status is not asserted, so this should be treated as 'no public exploit identified at time of analysis' rather than active exploitation. The CPE string is a placeholder ('n/a:n/a'), which means automated vulnerability scanners may fail to flag affected assets - verify product/version mapping with Tenda directly. |
| Exploit ScenarioDerived | An attacker who can reach the router's HTTP management interface (LAN-adjacent attacker, or WAN attacker if remote admin is enabled) sends a single HTTP request to the endpoint backed by ask_to_reboot with an oversized 'Go' parameter value. The handler copies the value into a fixed stack buffer, corrupts the saved return address, and the httpd process crashes - taking down network connectivity for all users behind the router until it reboots or is power-cycled. |
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Alert meAnalysisAIv1 – Jun 09, 2026
Remote denial of service in Tenda US_W3V1.0BR router firmware v1.0.0.3 allows unauthenticated network attackers to crash the device by sending a crafted value in the 'Go' parameter to the ask_to_reboot function, triggering a stack-based buffer overflow. No public exploit identified at time of analysis, though a third-party research repository on GitHub references the vulnerable function.
RemediationAI
No vendor-released patch identified at time of analysis; the only referenced URL is a third-party GitHub research repository (https://github.com/xhh0124/SemVulLLM/tree/main/W3/ask_to_reboot), not a Tenda security bulletin. Until Tenda publishes fixed firmware, restrict reachability of the router's web management interface by disabling any WAN-side remote management option and limiting LAN-side access to a trusted management VLAN or specific admin IPs via firewall rules - the trade-off is loss of convenient remote administration and added segmentation overhead. Consider replacing internet-exposed units with a supported model if Tenda does not issue a firmware update, and monitor Tenda's official security page for an advisory specifically referencing CVE-2026-36770 and the ask_to_reboot function.
Affects your stack
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Technical ContextAI · show details
The flaw resides in the ask_to_reboot handler of the Tenda US_W3V1.0BR consumer router's web management interface, where the 'Go' HTTP parameter is copied into a fixed-size stack buffer without adequate bounds checking. This is a classic CWE-121 (Stack-based Buffer Overflow) condition in embedded MIPS/ARM SOHO router firmware, a code pattern repeatedly identified across Tenda's product line where httpd-style CGI handlers parse query parameters using unsafe string operations (e.g., strcpy/sprintf) into stack frames. While the CVSS vector reports availability-only impact (C:N/I:N/A:H), the underlying primitive is a memory-corruption flaw that could in principle be escalated; the provided intelligence only substantiates the DoS outcome. CPE data was generic (cpe:2.3:a:n/a:n/a) and does not authoritatively bind the CVE to a specific vendor/product record.
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- Exploit and PoC references, threat intelligence from 22 sources
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Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Primary rating from Vendor (mitre) · only source for this CVE.
CVSS VectorVendor: mitre
Lifecycle Timeline
2DescriptionCVE.org
Shenzhen Tenda Technology Co., Ltd Tenda US_W3V1.0BR v1.0.0.3 was discovered to contain a stack overflow in the Go parameter of the ask_to_reboot function. This vulnerability allows attackers to cause a Denial of Service (DoS) via a crafted input.
Executive ViewAI
Tenda US_W3V1.0BR routers running firmware v1.0.0.3 contain a remote denial of service vulnerability allowing unauthenticated network attackers to crash devices, directly impacting network availability for affected deployments. Organizations using this router model require immediate mitigation and should prioritize vendor firmware updates. Without remediation, devices remain vulnerable to service disruption attacks.
No vendor-released patch identified at time of analysis. Implement the following interim mitigations: apply firewall rules blocking untrusted access to router management interfaces, isolate affected routers on dedicated VLANs accessible only to authorized personnel, deploy network intrusion detection to flag exploitation attempts targeting the ask_to_reboot function, monitor Tenda's security advisory channels weekly for firmware availability, and maintain inventory of alternative router models for expedited replacement if needed.
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.
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.
Denial of Service attacks render applications or systems unavailable by overwhelming resources or triggering failure conditions.
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