CVE-2026-36778
MediumCVSS 4.9Exploitation Probability (EPSS)
Low risk30th percentile - higher than 30% of all known CVEs
Summary
Tenda O3 router firmware v1.0.0.5(4180) has a stack overflow in the username parameter of the R7WebsSecurityHandler function. This allows an attacker to cause a Denial of Service (DoS) via a crafted HTTP request.
Risk Assessment
An attacker can remotely crash the router, disrupting network operations and causing service unavailability.
Recommendation
Apply available firmware updates or restrict management interface access to trusted networks only.
Other vulnerabilities in Tenda O3
See all- CVE-2026-36784High
The Tenda O3 Wireless Router v1.0.0.5(4180) contains a stack overflow in the ip parameter of the fromNetToolGet function. An attacker can exploit this vulnerability by sending an HTTP request, leading to a Denial of Service (DoS).
- CVE-2026-36783High
Tenda O3 Wireless Router v1.0.0.5(4180) has a stack overflow in the domain parameter of the fromNetToolGet function. This allows an attacker to cause a Denial of Service (DoS) via a crafted HTTP request.
- CVE-2026-36779High
Tenda O3 Wireless Router v1.0.0.5(4180) has multiple stack overflows in the fromVirtualSer function via parameters puVar2, puVar1, __s2, __s1_00, and puVar3. This allows an attacker to cause a Denial of Service (DoS) via a crafted HTTP request.
Original NVD description (English source)
Shenzhen Tenda Technology Co., Ltd Tenda O3 Wireless Router v1.0.0.5(4180) was discovered to contain a stack overflow in the username parameter of the R7WebsSecurityHandler function. This vulnerability allows attackers to cause a Denial of Service (DoS) via a crafted HTTP request.