CVE-2019-3405

Wireless client disconnection via crafted Null Data frame

Published Jan 11, 2021 · Updated Aug 4, 2024

Denial of service in Qihoo 360 360F5 Router 3.1.3.64296 and earlier allows physically proximate attackers to disconnect wireless clients. The router accepts a crafted illegal 802.11 Null Data frame and responds by transmitting a deauthentication frame. The attacker must be within Wi-Fi radio range; successful triggering interrupts connectivity for other associated terminals without rebooting the router.

CVSS severity5.3
Medium
EPSS probability1.01%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Denial of service in Qihoo 360 360F5 Router 3.1.3.64296 and earlier allows physically proximate attackers to disconnect wireless clients. The router accepts a crafted illegal 802.11 Null Data frame and responds by transmitting a deauthentication frame. The attacker must be within Wi-Fi radio range; successful triggering interrupts connectivity for other associated terminals without rebooting the router.

The record

CVE
CVE-2019-3405
Published
Jan 11, 2021
Updated
Aug 4, 2024
Vendor
Qihoo 360
Product
360F5 Router
Classifications
T1498
Attack vector
adjacent
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 11, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=3.1.3.64296 and lower version.

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesunauthenticated

What is affected?

Qihoo 360 · 360F5 Routerversion=3.1.3.64296 and lower version.

Published CVSS scores

5.3NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
5.0NIST NVDAV:N/AC:L/Au:N/C:N/I:N/A:P

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectoradjacent
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1498Network Denial of Service

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo