Vulnerability

CVE-2026-36778

Medium· 4.9CVSS4.9EPSS0%

.rules3/5

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

Threat signal

50/100

Elevated

Severity

medium

CVSS

4.9

EPSS

Active

CVSS

v3.1via NVDOpen in FIRST calculator →

4.9/ 10MEDIUMCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H

Attack VectorNetworkExploitable remotely over the internet — no local access needed.
Attack ComplexityLowNo special conditions — exploit works reliably.
Privileges RequiredHighAdmin / root privileges required.
User InteractionNoneFully automated — no victim action needed.
ScopeUnchangedImpact contained to the vulnerable component.
Confidentiality ImpactNoneNo confidentiality impact.
Integrity ImpactNoneNo integrity impact.
Availability ImpactHighTotal loss of availability — full DoS possible.

EPSS

Exploit prediction · 30-day horizonFIRST.org →

0.15%

probability of exploitation in next 30 days

p35

higher than 35% of all CVEs

3-day trend↑ 0.1pp

Low exploitation likelihood — defer if no other signals fire.

Vendor VEX

No VEX statements published for CVE-2026-36778. Vendors publish VEX (Vulnerability Exploitability eXchange) to assert per-product whether a CVE is actually exploitable in their distribution.

SSVCDefer

No exploitation, limited impact or prevalence

exploitation: none
automatable: no
impact: partial
mission: support

Lifecycle

2026-06-09Published
2026-06-10Last modified1 source

References

https://github.com/xhh0124/SemVulLLM/tree/main/O3/R7WebsSecurityHandler

No source-event history recorded yet. New revisions will appear here as ingestors re-fetch this CVE.